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Citation: Xiong Guo-Xing, Xia Xin-Rui, Chen Heng-Rong, Guo Xie-Xian. Synergetic Effect between NaCl and B₂O₃ in Modified FeO_χ Catalysts[J]. Acta Physico-Chimica Sinica, ;1994, 10(11): 971-977. doi: 10.3866/PKU.WHXB19941103 shu

Synergetic Effect between NaCl and B₂O₃ in Modified FeO_χ Catalysts

1.
State Key Laboratory of Catalysis,Dalian Institute of Chemical Physics,Chinese Academy of Science,Dalian 116023

Received Date: 30 August 1993
Available Online: 15 November 1994

A series of NaCl/B2O3/Fe2O3 catalysts having a B/Fe atomic ratio from 0 to 0.3 and 0.25 of Na/Fe atomic ratio were prepared for the oxidative coupling of methane (OCM). It was noted that NaCl and B2O3 show a synergetic effect: NaCl/Fe2O3 produces mainly CO2, but B2O3/ Fe2O3 and B2O3/NaCl have poor activity. NaCl/B2O3/Fe2O3 catalyst has however high activity and selectivity. When the addition of B2O3 approaches 15 (at)%, the C2 yield and selectivity reach their maxima, 17% and 75% respectively. The C2H4/C2 ratio is as high as 76%. XRD, XPS, H2-TPR, O2-TPD and In-situ Mossbauer were employed to investigate the properties of the catalysts. Results show there is a synergetic effect between NaCl and B2O3 on FeOx surface. B2O3 modifies the redox ability of Fe2O3. The NaCl modified B2O3/FeOx has high reduction and lattice oxygen evaporation rates at 750℃. The high activity and selectivity of the NaCl/B2O3/FeOx catalyst are closely related with this synergetic effect.
- NaCl/B2O3/Fex catalysts,
- Synergetic effect,
- Oxidative coupling of methane,
- XPS,
- H2-TPR and O2TPD
  ,
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Synergetic Effect between NaCl and B2O3 in Modified FeOχ Catalysts

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Synergetic Effect between NaCl and B₂O₃ in Modified FeO_χ Catalysts