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1995 Volume 12 Issue 6
1995, 12(6): 1-4
Abstract:
Based upon the studies on two light rare earth oxides La2O3 and CeO2, it was found that catalysts with smaller specific surface area showed higher selectivity for C2 forma-tion. Oxidation-redtiction properties of the catalysts can obviously affect the selectivity for C2 formation. Addition of Li+ ion can inhibit the ability of oxdation and redtiction of cata-lysts, improving C2 selectivity.
Based upon the studies on two light rare earth oxides La2O3 and CeO2, it was found that catalysts with smaller specific surface area showed higher selectivity for C2 forma-tion. Oxidation-redtiction properties of the catalysts can obviously affect the selectivity for C2 formation. Addition of Li+ ion can inhibit the ability of oxdation and redtiction of cata-lysts, improving C2 selectivity.
1995, 12(6): 5-8
Abstract:
This paper discussed the mechanical properties and the morphologies of PVC/NBR/CR ternary blends. The results of DMA,SEM and TEM indicated that NBR was a good compatibilizer for blends. Addition of small amounts (3% or 4%) NBR improved the impact strength of blends and caused the shift in Tg of PVC and CR to lower temperature compared with that of pure PVC and CR, demonstrating that the interaction between the two phases had been enlarged.
This paper discussed the mechanical properties and the morphologies of PVC/NBR/CR ternary blends. The results of DMA,SEM and TEM indicated that NBR was a good compatibilizer for blends. Addition of small amounts (3% or 4%) NBR improved the impact strength of blends and caused the shift in Tg of PVC and CR to lower temperature compared with that of pure PVC and CR, demonstrating that the interaction between the two phases had been enlarged.
1995, 12(6): 9-12
Abstract:
A new method for the preparation of catechol and hydroquinone by catalytic hy-droxvlation of phenol on titanium silicate(TS-1) has been reported in this paper. We have in-vestigated the influence of various parameters,such as reaction temperature,reaction time, concentration of TS-1 and mixing ratio of reactants. The results show that this method is cheaper,of higher selectivity and conversion and less pollution than that of conventional methods. In addition,we have explored the mechanism of the catalytic reaction and carried out the quantitative analysis of products.
A new method for the preparation of catechol and hydroquinone by catalytic hy-droxvlation of phenol on titanium silicate(TS-1) has been reported in this paper. We have in-vestigated the influence of various parameters,such as reaction temperature,reaction time, concentration of TS-1 and mixing ratio of reactants. The results show that this method is cheaper,of higher selectivity and conversion and less pollution than that of conventional methods. In addition,we have explored the mechanism of the catalytic reaction and carried out the quantitative analysis of products.
Synthesis,Characterization and Antibacterial Activity of N-Salicylideneamino Acid 3d Metal Complexes
1995, 12(6): 13-16
Abstract:
Schiff bases derived from salicylaldehyde and alanine or leucine and their Mn(Ⅱ),Co(Ⅱ),Ni(Ⅱ),Cu(Ⅱ),Zn(Ⅱ) complexes are synthesized. The structures of the com-plexes are characterized by elemental analysis,molar conductance, magnetic susceptibility,electronic spectra and infrared spectra. The stability constants of the complexes are deter-mined. Experiments show that the antibacterial activity of the complexes is stiperior to that of the ligands.
Schiff bases derived from salicylaldehyde and alanine or leucine and their Mn(Ⅱ),Co(Ⅱ),Ni(Ⅱ),Cu(Ⅱ),Zn(Ⅱ) complexes are synthesized. The structures of the com-plexes are characterized by elemental analysis,molar conductance, magnetic susceptibility,electronic spectra and infrared spectra. The stability constants of the complexes are deter-mined. Experiments show that the antibacterial activity of the complexes is stiperior to that of the ligands.
1995, 12(6): 17-20
Abstract:
The behaviour of melting and recrystallization of irradiated polyethylene has been investigated by using differential scanning calorimetry(DSC),small angle X-ray scattering(SAXS) and wide angle X-ray diffraction (WAXD) techniqties. It is indicated that the crys-talline structure of polyethylene was damaged and both apparent heat of fusion and crys-tallinity redticed with increasing radiation dose. After the irradiated polyethylene was melted and then recrystallized,the recrystallinity and melting temperature decreased with radiation dose.
The behaviour of melting and recrystallization of irradiated polyethylene has been investigated by using differential scanning calorimetry(DSC),small angle X-ray scattering(SAXS) and wide angle X-ray diffraction (WAXD) techniqties. It is indicated that the crys-talline structure of polyethylene was damaged and both apparent heat of fusion and crys-tallinity redticed with increasing radiation dose. After the irradiated polyethylene was melted and then recrystallized,the recrystallinity and melting temperature decreased with radiation dose.
1995, 12(6): 21-24
Abstract:
The effect of B2O3 and Fe2O3 on the surface acidity and propylene etherification with isopropanol to isopropyl ether has been investigated by XRD, XPS,NH3-TPD, FT-IR and chemisorption. These impregnated oxides played a great role in modifying the total sur-face acid amount and distribution of acid strength. The stronger interaction between oxides and Hβ-Al2O3 enhanced the L acid amount. Meanwhile,the performance of propylene etheri-fication was obviously improved. A good relationship between propylene conversion and sur-face L acid amount was detected.
The effect of B2O3 and Fe2O3 on the surface acidity and propylene etherification with isopropanol to isopropyl ether has been investigated by XRD, XPS,NH3-TPD, FT-IR and chemisorption. These impregnated oxides played a great role in modifying the total sur-face acid amount and distribution of acid strength. The stronger interaction between oxides and Hβ-Al2O3 enhanced the L acid amount. Meanwhile,the performance of propylene etheri-fication was obviously improved. A good relationship between propylene conversion and sur-face L acid amount was detected.
1995, 12(6): 25-28
Abstract:
A new approach was developed for the kinetic study of hydrogen evolution reac-tion in alkaline solution at inert electrodes. By impedance meastirements of the charge trans-fer resistance (Rct) at various overpotentials (η) and extrapolation of the linear η vs. log (1)/(Rct) plot to zero overpotential, kinetic parameters such as i0,b and a can be obtained which are in fairly good agreement with those obtained by polarization method. This approach can also be used to determine the rate determining step of a complicated reaction involving hydrogen desorption.
A new approach was developed for the kinetic study of hydrogen evolution reac-tion in alkaline solution at inert electrodes. By impedance meastirements of the charge trans-fer resistance (Rct) at various overpotentials (η) and extrapolation of the linear η vs. log (1)/(Rct) plot to zero overpotential, kinetic parameters such as i0,b and a can be obtained which are in fairly good agreement with those obtained by polarization method. This approach can also be used to determine the rate determining step of a complicated reaction involving hydrogen desorption.
1995, 12(6): 29-32
Abstract:
The photocatalytic destruction and decolorization of several water-soluble dyes under natural sun light and 450W high pressure Hg-lamp irradiation in the presence of photo-catalyst PbTiO3 were studied. The experiments show that the efficiency of decolorization is related to the pH value of dye solution,irradiation time,as well as the intensity of irradia-tion. After irradiation with sun light for 1h,the decolorizing efficiency was up to 90% when the concentration of dyes was 10mg/L and the amount of catalyst was 100mg in 50mL dye solution.
The photocatalytic destruction and decolorization of several water-soluble dyes under natural sun light and 450W high pressure Hg-lamp irradiation in the presence of photo-catalyst PbTiO3 were studied. The experiments show that the efficiency of decolorization is related to the pH value of dye solution,irradiation time,as well as the intensity of irradia-tion. After irradiation with sun light for 1h,the decolorizing efficiency was up to 90% when the concentration of dyes was 10mg/L and the amount of catalyst was 100mg in 50mL dye solution.
1995, 12(6): 33-37
Abstract:
The mechanism of electrochemical reactions of electrogenerated Co(Ⅰ) TPP and cyclohexyl bromide was investigated with cyclic voltammetry,in-situ ESR-spectroelec-trpchemistry and in-situ micro-electrode-CV thin-layer electrochemistry in DMF solution. The redox reaction of Co(Ⅱ) /Co(Ⅰ) parallelly catalyzed the reduction of cyclohexyl bromide,and generated both the cyclohexyl radicals and Co-C bond compound C6H11Co(Ⅲ)TPP. Further reduction of the Co-C bond compound at-1.30V(SCE) im-plied an EC mechanism,namely electrochemical reduction followed by Co-C bond splitting reaction which regenerated the cyclohexyl radicals with rate constant of 0.73s-1. The pres-ence of additional CH2=CHCN led to the generation of a new Co-C bond compound which gave rise to a reduction peak at -1.10V(SCE). A mechanism for the Co(Ⅱ) TPP/cyclo-hexyl bromide system, suggesting that the cyclohexyl bromide primarily reacts with electro-generated Co(Ⅰ) TPP via the production of the cyclohexyl radicals,has been proposed.
The mechanism of electrochemical reactions of electrogenerated Co(Ⅰ) TPP and cyclohexyl bromide was investigated with cyclic voltammetry,in-situ ESR-spectroelec-trpchemistry and in-situ micro-electrode-CV thin-layer electrochemistry in DMF solution. The redox reaction of Co(Ⅱ) /Co(Ⅰ) parallelly catalyzed the reduction of cyclohexyl bromide,and generated both the cyclohexyl radicals and Co-C bond compound C6H11Co(Ⅲ)TPP. Further reduction of the Co-C bond compound at-1.30V(SCE) im-plied an EC mechanism,namely electrochemical reduction followed by Co-C bond splitting reaction which regenerated the cyclohexyl radicals with rate constant of 0.73s-1. The pres-ence of additional CH2=CHCN led to the generation of a new Co-C bond compound which gave rise to a reduction peak at -1.10V(SCE). A mechanism for the Co(Ⅱ) TPP/cyclo-hexyl bromide system, suggesting that the cyclohexyl bromide primarily reacts with electro-generated Co(Ⅰ) TPP via the production of the cyclohexyl radicals,has been proposed.
1995, 12(6): 38-41
Abstract:
The natural mica slice was coated with TiO2 by the homogeneous precipitation method in which titanyl sulfate (TiOSO4) and urea were used as raw material. The forma-tion of the thin film and the technological factors influencing the film structure were studied. The adjustment of the temperature and time of the precipitation reaction in various stages favoured the control on the morphology of precipitated particles and the thickness of film lay-er,resulting to even and dense films. Owing to the optical interference effect,films with dif-ferent thickness display various color.
The natural mica slice was coated with TiO2 by the homogeneous precipitation method in which titanyl sulfate (TiOSO4) and urea were used as raw material. The forma-tion of the thin film and the technological factors influencing the film structure were studied. The adjustment of the temperature and time of the precipitation reaction in various stages favoured the control on the morphology of precipitated particles and the thickness of film lay-er,resulting to even and dense films. Owing to the optical interference effect,films with dif-ferent thickness display various color.
1995, 12(6): 42-46
Abstract:
Nine in one series of the rare earth element tungstovanadophosphoric tetrabasic heteropoly complexes with Keggin structtire were synthesized and characterized by chemical analysis, XPS,IR,UV,ESR,NMR,XRD and TG-DTA methods.
Nine in one series of the rare earth element tungstovanadophosphoric tetrabasic heteropoly complexes with Keggin structtire were synthesized and characterized by chemical analysis, XPS,IR,UV,ESR,NMR,XRD and TG-DTA methods.
1995, 12(6): 47-49
Abstract:
Amorphous zirconium(diphenylphosphinate-hydrogen phosphate)-ferric chloride complex Zr(HPO4)1.5[O2P(C6H5)2]·[FeCl2(OH)] was prepared. The complex is low hy-groscopic,not fumy and stable in air. The complex shows fairly good catalytic activity for Friedel-Crafts alkylation reaction of aromatic hydrocarbons with alkyl halides in liquid phase. The advantages of the reaction are: mild reaction condition,high yield of products,easy operation,simple after-treatment,and many times reuse of the catalyst.
Amorphous zirconium(diphenylphosphinate-hydrogen phosphate)-ferric chloride complex Zr(HPO4)1.5[O2P(C6H5)2]·[FeCl2(OH)] was prepared. The complex is low hy-groscopic,not fumy and stable in air. The complex shows fairly good catalytic activity for Friedel-Crafts alkylation reaction of aromatic hydrocarbons with alkyl halides in liquid phase. The advantages of the reaction are: mild reaction condition,high yield of products,easy operation,simple after-treatment,and many times reuse of the catalyst.
1995, 12(6): 50-52
Abstract:
The effect of organic sulfur accelerator on the deposition rate of chemical nickel-plating and on the oxidation rate of sodium hypophosphite was studied. It is found that the acceleration mechanism is due to the catalytic action of accelerator for the oxidation of hy-pophosphite. The results of XPS indicate that the coating is composed of Ni and Ni2P alloy. The composition(relative atomic concentration %) of the Ni-P coating are Ni 74.3%,P 18.3%,O 5.8% and S 1.6% as obtained from the AES depth profile curves.
The effect of organic sulfur accelerator on the deposition rate of chemical nickel-plating and on the oxidation rate of sodium hypophosphite was studied. It is found that the acceleration mechanism is due to the catalytic action of accelerator for the oxidation of hy-pophosphite. The results of XPS indicate that the coating is composed of Ni and Ni2P alloy. The composition(relative atomic concentration %) of the Ni-P coating are Ni 74.3%,P 18.3%,O 5.8% and S 1.6% as obtained from the AES depth profile curves.
1995, 12(6): 53-55
Abstract:
A non-aqueous solvent system is introduced,several cellulose derivatives contain-ing phosphorus have been synthesized in this solvent and their physico-chemical properties have been characterized as well.
A non-aqueous solvent system is introduced,several cellulose derivatives contain-ing phosphorus have been synthesized in this solvent and their physico-chemical properties have been characterized as well.
1995, 12(6): 56-58
Abstract:
The rate of zinc delayed corrosion and the role of cetyl pyridine chloride in the de-layed corrosion inhibition of zinc in hydrochloric acid have been investigated by weight ioss method. The experimental data have been treated with adsorption theory and Mathur method which leading to a rate equation, from which the kinetic parameters are calculated. The mechanism and relationship among temperature,concentration and delayed corrosion in-hibition have been discussed.
The rate of zinc delayed corrosion and the role of cetyl pyridine chloride in the de-layed corrosion inhibition of zinc in hydrochloric acid have been investigated by weight ioss method. The experimental data have been treated with adsorption theory and Mathur method which leading to a rate equation, from which the kinetic parameters are calculated. The mechanism and relationship among temperature,concentration and delayed corrosion in-hibition have been discussed.
1995, 12(6): 59-61
Abstract:
It is found that rare earth acetylacetonates can initiate the ring-opening polymer-ization of ε-caprolactone and lactide. The effects of temperature solvent,polymerization time,rare earth element and ligand were studied. The results showed that rare earth acety-lacetonates,particularly Y(acac)3,were good catalysts for the polymerization of ε-caprolac-tone and lactide. Crystalline polycaprolactone with viscosity-average molecular weight of 1.4 × 105 could be obtained at 80℃ in quantitative yield.
It is found that rare earth acetylacetonates can initiate the ring-opening polymer-ization of ε-caprolactone and lactide. The effects of temperature solvent,polymerization time,rare earth element and ligand were studied. The results showed that rare earth acety-lacetonates,particularly Y(acac)3,were good catalysts for the polymerization of ε-caprolac-tone and lactide. Crystalline polycaprolactone with viscosity-average molecular weight of 1.4 × 105 could be obtained at 80℃ in quantitative yield.
1995, 12(6): 62-64
Abstract:
A series of new 1,2,3-thiadiazol-4-formylthiourea derivatives were synthesized and their structures were confirmed by means of 1H NMR,IR, mass spectrometry and ele-mental analysis. The preliminary biological tests showed that these compounds had some ac-tivities on plant growth regulation.
A series of new 1,2,3-thiadiazol-4-formylthiourea derivatives were synthesized and their structures were confirmed by means of 1H NMR,IR, mass spectrometry and ele-mental analysis. The preliminary biological tests showed that these compounds had some ac-tivities on plant growth regulation.
1995, 12(6): 65-67
Abstract:
The microstructure of polyoxymethylene (POM)/polyurethane (PU)/ethylene-vinylacetate copolymer blends were analyzed by SEM, DSC and WAXD techniques,andtheir mechanical properties were measured. The results showed that the addition of PU caused the decrease of Tm and crystallinity of blends,the increase of the crystallite size L110 and the cell parameters of the blends,the decrease of the tensile strength and the appearance of peak value in notched impact strength. Crystallite size L110 between 10.86nm and 14.87nm led to modified POM with good balanced mechanical properties.
The microstructure of polyoxymethylene (POM)/polyurethane (PU)/ethylene-vinylacetate copolymer blends were analyzed by SEM, DSC and WAXD techniques,andtheir mechanical properties were measured. The results showed that the addition of PU caused the decrease of Tm and crystallinity of blends,the increase of the crystallite size L110 and the cell parameters of the blends,the decrease of the tensile strength and the appearance of peak value in notched impact strength. Crystallite size L110 between 10.86nm and 14.87nm led to modified POM with good balanced mechanical properties.
Polymerization of Methyl Methacrylate,Propylene Oxide and Caprolactone by Catalysts Ln(acac)3/BuMgCl
1995, 12(6): 68-70
Abstract:
The polymerization of methyl methacrylate(MMA), propylene oxide(PO) and ε-caprolactone(ε-Cl) catalyzed by Ln(acac)3/BuMgCl(Ln=Y, Nd, Sm) has been studied. The results show that the polymerization conversion of MMA in petroleum ether was higher than that in aromatic hydrocarbons and polar solvents, and the polymerization conversion of ε-Cl in petroleum ether and toluene reached 100%. The molecular weight distribution param-eters of PMMA, PPO and P(ε-Cl) were 1.37,1.39 and 2.10 respectively.
The polymerization of methyl methacrylate(MMA), propylene oxide(PO) and ε-caprolactone(ε-Cl) catalyzed by Ln(acac)3/BuMgCl(Ln=Y, Nd, Sm) has been studied. The results show that the polymerization conversion of MMA in petroleum ether was higher than that in aromatic hydrocarbons and polar solvents, and the polymerization conversion of ε-Cl in petroleum ether and toluene reached 100%. The molecular weight distribution param-eters of PMMA, PPO and P(ε-Cl) were 1.37,1.39 and 2.10 respectively.
1995, 12(6): 71-73
Abstract:
2,4-Dinitro-and dicvano-homocubanes were synthesized from homocubane-2,4-di-carboxylic acid. DSC analysis of their thermal decomposition is also presented.
2,4-Dinitro-and dicvano-homocubanes were synthesized from homocubane-2,4-di-carboxylic acid. DSC analysis of their thermal decomposition is also presented.
1995, 12(6): 74-76
Abstract:
A comparative study of variable-angle synchronous fluorimetry and derivative-variable-angle synchronous fluorimetry was performed using a binary mixture of aniline and 1-naphthol. Rapid simultaneous determination was accomolished by these two analytical techniques and satisfactory results were obtained.
A comparative study of variable-angle synchronous fluorimetry and derivative-variable-angle synchronous fluorimetry was performed using a binary mixture of aniline and 1-naphthol. Rapid simultaneous determination was accomolished by these two analytical techniques and satisfactory results were obtained.
1995, 12(6): 77-79
Abstract:
Based on the difference of melt flow viscosity and solubility parameters between polypropylene(PP) and poly(ethylene terephthalate)(PET),self reinforced blends of PP/PET in different ratio are made by extrusion. The fiber morphology of PET is observed un-der SEM and the diameter of the fiber fotind is from 2 to 10μm. Although the tensile strength of the blend decreases slightly,the impact strength increases as compared to that of PP.
Based on the difference of melt flow viscosity and solubility parameters between polypropylene(PP) and poly(ethylene terephthalate)(PET),self reinforced blends of PP/PET in different ratio are made by extrusion. The fiber morphology of PET is observed un-der SEM and the diameter of the fiber fotind is from 2 to 10μm. Although the tensile strength of the blend decreases slightly,the impact strength increases as compared to that of PP.
1995, 12(6): 80-82
Abstract:
The positional isomers α- and β- naphthols were effectively separated by sulfatase from Helix pomatia. The appropriate separation conditions were investigated. The mecha-nism of the enzymatic reactions concerned was experimentally analyzed and the corresponding kinetic constants were determined as well.
The positional isomers α- and β- naphthols were effectively separated by sulfatase from Helix pomatia. The appropriate separation conditions were investigated. The mecha-nism of the enzymatic reactions concerned was experimentally analyzed and the corresponding kinetic constants were determined as well.
1995, 12(6): 83-85
Abstract:
The activated bentonite was prepared with the bentonite from Nanhai,Guang-dong Province. The technological process and reaction conditions were studied. The compo-sition of the product was determined by chemical analysis,IR spectra and X-ray diffraction methods. The decolorizing efficiency,the activation grade and the free acid content of the product were measured also.
The activated bentonite was prepared with the bentonite from Nanhai,Guang-dong Province. The technological process and reaction conditions were studied. The compo-sition of the product was determined by chemical analysis,IR spectra and X-ray diffraction methods. The decolorizing efficiency,the activation grade and the free acid content of the product were measured also.
1995, 12(6): 86-88
Abstract:
Rheological behaviour of polypropylene carbonate(PPC) has been studied. PPC is proved to be a pseudoplastic fluid. Its apparent viscosity decreases with increase of tempera-ture,and the apparent activation energy decreases with increase of shearing rate as well. Quantitative relation between its viscosity and viscosity-average molecular weight is ob-tained.
Rheological behaviour of polypropylene carbonate(PPC) has been studied. PPC is proved to be a pseudoplastic fluid. Its apparent viscosity decreases with increase of tempera-ture,and the apparent activation energy decreases with increase of shearing rate as well. Quantitative relation between its viscosity and viscosity-average molecular weight is ob-tained.
1995, 12(6): 89-91
Abstract:
The mechanism of promoting effects of chromium for Cu-Cr2O3 catalytie synthesis of acrylamide was investigated by the measurements of specific surface area,bulk density of catalysts,optical microscope photograms,SEM,XPS,DTA-TG and oxidaton kinetics of the catalysts. Addition of 0.5 atom percent of chromium to the reduced copper catalyst in-creased the conversion of acrylonitrile from 77% to 98%, specific surface area from 5.7 to 11.3m2/g and oxidation rate of the catalyst. The mechanism of nucleophilic attack of water activated by catalyst to carbon atom of C-N bond of acrylonitrile was suggested.
The mechanism of promoting effects of chromium for Cu-Cr2O3 catalytie synthesis of acrylamide was investigated by the measurements of specific surface area,bulk density of catalysts,optical microscope photograms,SEM,XPS,DTA-TG and oxidaton kinetics of the catalysts. Addition of 0.5 atom percent of chromium to the reduced copper catalyst in-creased the conversion of acrylonitrile from 77% to 98%, specific surface area from 5.7 to 11.3m2/g and oxidation rate of the catalyst. The mechanism of nucleophilic attack of water activated by catalyst to carbon atom of C-N bond of acrylonitrile was suggested.
1995, 12(6): 92-94
Abstract:
The relaxation temperatures of polystyrene were measured by thermally stimulat-ed current method. The influence of storage time of sample,sample thickness,number of polarization cycles and velocity of temperature rise on the relaxation were studied and the ac-tivation energy of relaxation was calculated.
The relaxation temperatures of polystyrene were measured by thermally stimulat-ed current method. The influence of storage time of sample,sample thickness,number of polarization cycles and velocity of temperature rise on the relaxation were studied and the ac-tivation energy of relaxation was calculated.
1995, 12(6): 95-96
Abstract:
The n-valeraldehyde can be synthesized with one step oxiclation in the water-dichromate-sulfuric acid system. By using this method,the experimental conditions are easy to control and operate and the method of refinement is distinctive for n-valeralclehyde.
The n-valeraldehyde can be synthesized with one step oxiclation in the water-dichromate-sulfuric acid system. By using this method,the experimental conditions are easy to control and operate and the method of refinement is distinctive for n-valeralclehyde.
1995, 12(6): 97-98
Abstract:
La2-x MxCuO4(M=Ca,Sr,Ba) superconductors have been synthesized at 280~300℃ by precipitation from molten NaOH/KOH/KNO3. However,synthesis of Tm-Ca-Cu-O, Sr-Ca-Cu-O and Hg-Ba-Ca-Cu-O superconductors by using the alkali flux method are un-successful. A brief discussion for applicability of the alkali flux method has been given.
La2-x MxCuO4(M=Ca,Sr,Ba) superconductors have been synthesized at 280~300℃ by precipitation from molten NaOH/KOH/KNO3. However,synthesis of Tm-Ca-Cu-O, Sr-Ca-Cu-O and Hg-Ba-Ca-Cu-O superconductors by using the alkali flux method are un-successful. A brief discussion for applicability of the alkali flux method has been given.
1995, 12(6): 99-100
Abstract:
In this paper the additive effect of potassium promoter on the Ni-Co-O and Zn-Co-O composite oxide catalysts was investigated by using XRD,TPR and XPS techniques. The results show that the specific area of these catalysts increases 4~5 times by the potassium addition and the catalytic activity of acetone and alcohol oxidation is enhanced.
In this paper the additive effect of potassium promoter on the Ni-Co-O and Zn-Co-O composite oxide catalysts was investigated by using XRD,TPR and XPS techniques. The results show that the specific area of these catalysts increases 4~5 times by the potassium addition and the catalytic activity of acetone and alcohol oxidation is enhanced.
1995, 12(6): 101-102
Abstract:
The added amount,particle size,type of bentonite as an adsorbent for adsorping heavy metallic ions in the battery solution were studied. And temperature influence of ad-sorptive capacity was also studied. Results show that the bentonite is a good adsorbent for heavy metallic ions in the battery solution. The replacement of flour and starch with ben-tonite in making paste layer of battery will not only save grain and reduce the cost, but also improve the properties of battery to meet the national standard (GB 7112-86).
The added amount,particle size,type of bentonite as an adsorbent for adsorping heavy metallic ions in the battery solution were studied. And temperature influence of ad-sorptive capacity was also studied. Results show that the bentonite is a good adsorbent for heavy metallic ions in the battery solution. The replacement of flour and starch with ben-tonite in making paste layer of battery will not only save grain and reduce the cost, but also improve the properties of battery to meet the national standard (GB 7112-86).
