THE OXIDATIVE DEHYDROGENATION OF ETHANE OVER MOLYBDENUM VANADIUM NIOBIUM OXIDE CATALYSTS - THE ROLE OF CATALYST COMPOSITION

被引：96

作者：

DESPONDS, O ^{[1
]}

KEISKI, RL ^{[1
]}

SOMORJAI, GA ^{[1
]}

机构：

[1] UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720

来源：

CATALYSIS LETTERS | 1993年 / 19卷 / 01期

关键词：

OXYDEHYDROGENATION OF ETHANE; MO-V-NB OXIDE CATALYSTS;

D O I：

10.1007/BF00765198

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 oxidative dehydrogenation rf ethane has been studied at atmospheric pressure using molybdenum-vanadium-niobium oxide catalysts in the temperature range of 350-450-degrees-C. The presence of all three oxides together is necessary in order to have active and selective catalysts. The best results have been obtained using a mixture having a Mo : V : Nb ratio of 19 : 5 : 1. Our studies of the variation of oxide composition suggest that the active phase is based on molybdenum and vanadium. Niobium enhances the intrinsic activity of the molybdenum-vanadium combination and improves the selectivity by inhibiting the total oxidation of ethane to carbon dioxide. The apparent activation energies for the conversion of ethane to ethylene, carbon monoxide and carbon dioxide were 18, 27 and 17 kcal/mol, respectively. The addition of water vapor to the gas stream does not affect the product distribution on this catalyst.

引用

页码：17 / 32

页数：16

共 13 条

[1]

[Anonymous], 1958, PROPERTIES GASES LIQ

[2] OXIDATIVE DEHYDROGENATION OF ETHANE ON VANADIUM MOLYBDENUM OXIDE AND VANADIUM NIOBIUM MOLYBDENUM OXIDE CATALYSTS [J].