Characterization and catalytic behavior of MoO3/V2O5/Nb2O5 systems in isopropanol decomposition

被引：19

作者：

de Paiva, J. B., Jr.

Monteiro, W. R.

Zacharias, M. A.

Rodrigues, J. A. J.

Cortez, G. G.

机构：

[1] Univ Sao Paulo, Lab Catalise II, Escola Engn Lorena, BR-12600000 Lorena, SP, Brazil

[2] Inst Nacl Pesquisas Espaciais, Lab Associado Combustao & Propulsao, BR-12630000 Cachoeira Paulista, SP, Brazil

来源：

BRAZILIAN JOURNAL OF CHEMICAL ENGINEERING | 2006年 / 23卷 / 04期

关键词：

niobium oxide; vanadium oxide; molybdenum oxide; isopropanol conversion;

D O I：

10.1590/S0104-66322006000400009

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

The influence of molybdenum oxide as a promoter on the V2O5/Nb2O5 system was investigated. A series of MoO3/V2O5/Nb2O5 catalysts, with MoO3 loading ranging from 1 to 3 Wt% MoO3 and fixed V2O5 content (21 wt%), were prepared by impregnation of the Nb2O5 support with an aqueous solution of ammonium metavanadate and ammonium molybdate. The acid-base properties of the catalysts were investigated to determine of the selectivity of the isopropanol decomposition reaction. The X-ray diffraction results showed the presence of the beta-(Nb,V)(2)O-5 phase. The temperature-programmed reduction profiles showed that the reducibility of vanadium was affected by the presence of molybdenum oxide. Activity results for isopropanol decomposition revealed that the acid-base properties of V2O5/Nb2O5 catalysts are affected upon incorporation of MoO3, specifically for loadings of 3 wt %. For this catalyst composition both propylene and acetone formation rates decreased.

引用

页码：517 / 524

页数：8

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