Isobutanol dehydrogenation on copper-containing bismuth vanadates

被引：6
|
作者：
Povarova, E. I. [1 ]
Pylinina, A. I. [1 ]
Mikhalenko, I. I. [1 ]
机构：
[1] Patrice Lumumba Peoples Friendship Univ, Moscow 117198, Russia
来源：
RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A | 2013年 / 87卷 / 04期
基金：
俄罗斯基础研究基金会;
关键词：
dehydrogenation; isobutanol; perovskites; selectivity; catalyst; TRANSPORT;
D O I：
10.1134/S0036024413040237
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
It is found that alpha, beta, and I" modifications of perovskites Bi4V2 - 2x Cu-2x O11 - delta (BICUVOX) exhibit different activities during catalytic transformations of isobutanol with a selectivity of isobutanal formation 85-100%. Data analysis shows that the site for the alcohol dehydrogenation reaction is the ion pair Cu2+-O2- with the highest activity for a highly conductive gamma-phase. It is shown that the activation energy for aldehyde formation is lower for gamma-phase of the catalyst by a factor of ten than that for its alpha-phase. It is concluded that step-wise Arrhenius dependences without changes in the activation energy for parallel alcohol dehydrogenation and dehydration reactions are related to changes in the conducting properties of the catalyst. Step change in activity was found at temperatures of 310 and 370A degrees and corresponds to an increase of the solid solution electric conductivity.
引用
收藏
页码：560 / 564
页数：5
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