引用本文:
Xue Mei Liao, Wei Chu, Yang Li, Fu Dong Zhou, Shi Zhong Luo. Effects of support pore size on new Cs2.5H0.5PW12O40/SiO2 catalysts for the ring-opening polymerization of tetrahydrofuran[J]. Chinese Chemical Letters,
2009, 20(3): 344-347.
doi:
10.1016/j.cclet.2008.11.032
Citation: Xue Mei Liao, Wei Chu, Yang Li, Fu Dong Zhou, Shi Zhong Luo. Effects of support pore size on new Cs2.5H0.5PW12O40/SiO2 catalysts for the ring-opening polymerization of tetrahydrofuran[J]. Chinese Chemical Letters, 2009, 20(3): 344-347. doi: 10.1016/j.cclet.2008.11.032
Citation: Xue Mei Liao, Wei Chu, Yang Li, Fu Dong Zhou, Shi Zhong Luo. Effects of support pore size on new Cs2.5H0.5PW12O40/SiO2 catalysts for the ring-opening polymerization of tetrahydrofuran[J]. Chinese Chemical Letters, 2009, 20(3): 344-347. doi: 10.1016/j.cclet.2008.11.032
Effects of support pore size on new Cs2.5H0.5PW12O40/SiO2 catalysts for the ring-opening polymerization of tetrahydrofuran
摘要:
Mesoporous silica supported Cs2.5H0.5PW12O40 catalysts were prepared by impregnation method, and several silica supports with different pore size were utilized. N2 adsorption, XRD and ICP-AES techniques were utilized to characterize the silica supports and catalysts. XRD results showed that the dispersion of Cs2.5H0.5PW12 was better for the silica support with larger pore size. The catalytic activity results showed that the pore size played important role on the catalyst activity and the molecular weight of PTHF.When Cs2.5H0.5PW12O40 was dispersed on larger pore size silica support, the catalysts showed good performances for the synthesis of PTHF. The molecular weight of PTHF product on the sample in which Cs2.5H0.5PW12O40 was dispersed on larger pore support was higher than that on the catalyst with smaller pore support. The leaching amounts of the active components for the supported Cs2.5H0.5PW12O40 catalysts were much lower. After five reaction cycles, there were still good activities and stabilities for the supported Cs2.5H0.5PW12O40 catalysts with larger pore silica supports. These results were much better than those of the supported heteropolyacid H3PW12O40 catalyst.
English
Effects of support pore size on new Cs2.5H0.5PW12O40/SiO2 catalysts for the ring-opening polymerization of tetrahydrofuran
Abstract:
Mesoporous silica supported Cs2.5H0.5PW12O40 catalysts were prepared by impregnation method, and several silica supports with different pore size were utilized. N2 adsorption, XRD and ICP-AES techniques were utilized to characterize the silica supports and catalysts. XRD results showed that the dispersion of Cs2.5H0.5PW12 was better for the silica support with larger pore size. The catalytic activity results showed that the pore size played important role on the catalyst activity and the molecular weight of PTHF.When Cs2.5H0.5PW12O40 was dispersed on larger pore size silica support, the catalysts showed good performances for the synthesis of PTHF. The molecular weight of PTHF product on the sample in which Cs2.5H0.5PW12O40 was dispersed on larger pore support was higher than that on the catalyst with smaller pore support. The leaching amounts of the active components for the supported Cs2.5H0.5PW12O40 catalysts were much lower. After five reaction cycles, there were still good activities and stabilities for the supported Cs2.5H0.5PW12O40 catalysts with larger pore silica supports. These results were much better than those of the supported heteropolyacid H3PW12O40 catalyst.
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Key words:
- PTHF synthesis
- / Cs2.5H0.5PW12O40catalysts
- / Mesoporous silica
- / Pore size
- / Stability
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