催化学报

催化学报 ›› 2007, Vol. 28 ›› Issue (12): 1037-1040.

• 研究论文 • 上一篇    下一篇

掺Ni钒磷氧化物催化剂的合成和表征

TAUFIQ-YAP Yun Hin, ABDUL GHANI Abdul Aziz   

  1. 博特拉大学科学院化学系博特拉科学和技术实验室, 雪兰莪州沙登区 43400, 马来西亚
  • 收稿日期:2007-12-25 出版日期:2007-12-25 发布日期:2007-12-25

Synthesis and Characterization of Ni-Doped Vanadium Phosphorus Oxide Catalysts

TAUFIQ-YAP Yun Hin*, ABDUL GHANI Abdul Aziz   

  1. Putra Laboratory for Catalysis Science and Technology, Department of Chemistry, Faculty of Science, Putra University, Serdang 43400, Selangor, Malaysia
  • Received:2007-12-25 Online:2007-12-25 Published:2007-12-25

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925

被引次数

2

摘要： 以VOPO4•2H2O为原料制备了钒磷氧化物催化剂,考察了镍掺杂 (1%, 2%和5%) 对该催化剂的影响. 低掺杂量的Ni明显提高了活性晶格氧物种 O- 的数量,降低了V5+和 V4+相的还原峰温. 粉末X射线衍射、程序升温还原和化学分析结果表明,高掺杂量的 Ni 促使V5+物相生成并抑制V4+物相出现. 高含量与V5+相关的氧物种会降低正丁烷的转化率,但会提高马来酸酐的选择性.

关键词: 焦磷酸钒酰, 镍, 正丁烷, 氧化, 马来酸酐

Abstract: The effect of Ni doping (1%, 2%, and 5%) on vanadium phosphate catalysts prepared via VOPO4•2H2O was described and discussed. At low levels, the Ni dopant significantly enhanced the amount of the active lattice oxygen species O- and lowered the reduction peak temperature corresponding to the reduction of V5+and V4+phases. A combination of powderX-raydiffraction, temperature-programmed reduction, and chemical analysis data shows that at higher levels, Ni doping induced the formation of the V5+phase and suppressed the presence of the V4+phase. Previous studies have indicated that a large amount of oxygen species associated with V5+ inhibit the n-butane conversion but promote the selectivity for maleic anhydride.

Key words: vanadyl pyrophosphate, nickel, n-butane, oxidation, maleic anhydride