Activity of V2O5/TiO2 modified by phosphorus in the oxidative dehydrogenation of ethane into ethene

被引：8
|
作者：
El-Drissi, J [1 ]
Kacimi, M [1 ]
Loukah, M [1 ]
Ziyad, M [1 ]
机构：
[1] Fac Sci, Dept Chim, Lab Physicochim Mat & Catalyse, Rabat, Morocco
来源：
JOURNAL DE CHIMIE PHYSIQUE ET DE PHYSICO-CHIMIE BIOLOGIQUE | 1997年 / 94卷 / 11-12期
关键词：
oxydative dehydrogenation; ethane; vanadyl phosphate;
D O I：
10.1051/jcp/1997941984
中图分类号：
Q5 [生物化学]; Q7 [分子生物学];
学科分类号：
071010 ; 081704 ;
摘要：
The present study deals with ethane dehydrogenation on V2O5/TiO2 modified by different amounts of P2O5. Catalysts containing P/V ratios ranging from 0 to 3.3 were prepared by impregnation in presence of oxalic acid. Their characterization by various spectroscopic techniques showed that in absence of phosphorus, the vanadium is essentially present in the sample as V5+. Addition of P2O5 favors the formation of supported vanadyl phosphate and isolated V4+ species. Catalytic measurements have showed that phosphorus improves the selectivity towards ethene. At 550 degrees C, the total conversion reaches 33% and the selectivity 50%. The activity of the sample investigated seems to be governed by the V5+/V4+ ratio. At higher concentration of V5+ like. in V2O5/TiO2 a good activity is achieved but the selectivity is poor. When the concentration of V4+ is increased by an addition of P2O5 the selectivity increases.
引用
收藏
页码：1984 / 1992
页数：9
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