能源化学(英文版)

能源化学(英文) ›› 2005, Vol. 14 ›› Issue (1): 54-60.

• Articles • 上一篇    

Selective Oxidation of Isobutane over NH4CsFePVMoAs Heteropolycompound Catalysts

Tiejun Cai,Zhengjun Fang, Qian Deng, Zhenshan Peng   

  1. Department of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, China
  • 出版日期:2005-03-30 发布日期:2005-03-30

Selective Oxidation of Isobutane over NH4CsFePVMoAs Heteropolycompound Catalysts

Tiejun Cai,Zhengjun Fang, Qian Deng, Zhenshan Peng   

  • Online:2005-03-30 Published:2005-03-30

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摘要： A series of NH4Cs1:5Fe0:08HxPVMo11AsaOy heteropolycompound catalysts for the selective oxidation of isobutane, having Keggin structure, were synthesized by using co-precipitation method. The catalysts were characterized by FT-IR, H2-TPR, TG-DTA, SEM and XRD. Effects of the As content, reaction time, reaction temperature and molar ratio of isobutane to oxygen in feedstock on the activity and selectivity of the catalyst were investigated. The activation energy of the catalysts was measured by kinetics researches. Results showed the introduction of Cs+ into the catalysts shortened the stable period of them and enhanced their catalytic activity for the selective oxidation of isobutane. The highest conversion of isobutane and the total selectivity to liquid products were 18.6% and 81.2%, respectively, which were obtained at 380oC with a space velocity of 975 h over the NH4Cs1:5Fe0:08HxPVMo11As0:3Oy heteropolycompound catalyst. It is confirmed that completely oxidized products were controlled well.

关键词: heteropolycompound catalyst, isobutane, selective oxidation, methacrylic acid, methacrolein

Abstract: A series of NH4Cs1:5Fe0:08HxPVMo11AsaOy heteropolycompound catalysts for the selective oxidation of isobutane, having Keggin structure, were synthesized by using co-precipitation method. The catalysts were characterized by FT-IR, H2-TPR, TG-DTA, SEM and XRD. Effects of the As content, reaction time, reaction temperature and molar ratio of isobutane to oxygen in feedstock on the activity and selectivity of the catalyst were investigated. The activation energy of the catalysts was measured by kinetics researches. Results showed the introduction of Cs+ into the catalysts shortened the stable period of them and enhanced their catalytic activity for the selective oxidation of isobutane. The highest conversion of isobutane and the total selectivity to liquid products were 18.6% and 81.2%, respectively, which were obtained at 380oC with a space velocity of 975 h over the NH4Cs1:5Fe0:08HxPVMo11As0:3Oy heteropolycompound catalyst. It is confirmed that completely oxidized products were controlled well.

Key words: heteropolycompound catalyst, isobutane, selective oxidation, methacrylic acid, methacrolein