Dispersion and reactivity of Mo/Nb2O5 catalysts in the ammoxidation of toluene to benzonitrile

被引：11

作者：

Chary, KVR ^{[1
]}

Reddy, KR ^{[1
]}

Bhaskar, T ^{[1
]}

Sagar, GV ^{[1
]}

机构：

[1] Indian Inst Chem Technol, Catalysis Div, Hyderabad 500007, Andhra Pradesh, India

来源：

GREEN CHEMISTRY | 2002年 / 4卷 / 03期

关键词：

D O I：

10.1039/b109436j

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A series of Mo/Nb2O5 catalysts were prepared with Mo loadings ranging from 2.5-15 wt% of Mo and characterized by X-ray diffraction (XRD), pulse oxygen chemisorption, temperature-programmed desoprtion of ammonia. Dispersion of molybdena was determined by oxygen chemisorption at 623 K in a dynamic method. At low Mo loadings molybdenum oxide is found to be present in a highly dispersed state. XRD results show the presence of crystalline MoO3 at higher Mo loadings (from 10 wt%). The dispersion of molybdena was found to decrease with increased Mo loading due to formation of MoO3. The catalytic properties were evaluated for the vapour phase ammoxidation of toluene to benzonitrile and are related to different characterization results.

引用

页码：206 / 209

页数：4

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