The reaction mechanism of the selective oxidation butane on (VO)(2)P2O7 catalysts: The influence of the valence state of vanadium

被引：54

作者：

Rodemerck, U

Kubias, B

Zanthoff, HW

Wolf, GU

Baerns, M

机构：

[1] INST ANGEW CHEM ADLERSHOF EV,D-12484 BERLIN,GERMANY

[2] RUHR UNIV BOCHUM,LEHRSTUHL TECH CHEM,D-44780 BOCHUM,GERMANY

来源：

APPLIED CATALYSIS A-GENERAL | 1997年 / 153卷 / 1-2期

关键词：

n-butane oxidation; maleic anhydride; furan; redox mechanism; VPO catalysts;

D O I：

10.1016/S0926-860X(96)00331-6

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：

The selective oxidation of n-butane to maleic anhydride (MA) on (VO)(2)P2O7-based catalysts having different vanadium oxidation states (+3.18 to +4.90) was studied by a vacuum transient technique applying the Temporal-Analysis-of-Products (TAP) reactor. Experiments in the absence of gas-phase oxygen (anaerobic conditions) revealed that all steps of the oxidation to MA may proceed on V5+ as well as on V4+ sites and that the step from furan to MA needs the catalyst state with the highest oxidation potential. In equilibrated (VO)(2)P2O7 catalysts the valence state of the vanadium in the surface layers involved in the selective reaction amounted to +4 and +5. Under such conditions all reaction steps primarily occur on V5+ centers but a contribution of the redox couple V4+/V3+ in these steps cannot be excluded.

引用

页码：217 / 231

页数：15

共 25 条

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