摘要
利用X射线衍射 (XRD)、X射线光电子能谱 (XPS)及傅利叶红外光谱 (FT IR)等手段考察了添加剂Zr、Mo、Zn和机械球磨对VPO催化剂结构与性质的影响 ,采用正丁烷选择氧化反应评价催化剂的催化性能。实验表明 ,添加Mo ,Zn会减少 (2 0 0 )面的相对暴露 ,但是可以增大表面 +4价钒的相对比例 ,因此反应活性提高。助剂Zr可能会取代表面 +4价的钒 ,明显增大催化剂的表面P/V比 ,因此没有明显的助催化作用。机械球磨可以明显增大VPO催化剂活性组分 (VO) 2 P2 O7晶相 (2 0 0 )面的相对暴露 ,导致催化剂的反应活性上升。
Effect of Zr, Mo and Zn additives and physical milling on the properties of VPO catalysts have been investigated by means of XRD, XPS and FT-IR Addition of Mo and Zn decreased the relative exposure of (200) plane, however, the relative concentration of the surface V 4+ increased, therefore, the catalytic performance was increased Addition of Zr appeared to increase the surface P/V ratios of the catalysts, and the element V on the surface was substituted by Zr, so that Zr component showed insignificant promoting effect Physical milling process increased the relative exposure of (200) plane, and the catalytic performance was enhanced
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
2001年第2期144-148,共5页
Journal of Fuel Chemistry and Technology
基金
国家自然科学基金"九五"重大项目! (2 9792 0 73 1)
中国石化集团公司联合资助项目! (1997 2 0 0 0 )&&
