An FT-IR study of the adsorption of isopropanol on calcined layered double hydroxides containing isopolyrnolybdate

被引：21

作者：

Carriazo, Daniel ^{[1
]}

Martin, Cristina ^{[1
]}

Rives, Vicente ^{[1
]}

机构：

[1] Univ Salamanca, Dept Quim Inorgan, E-37008 Salamanca, Spain

来源：

CATALYSIS TODAY | 2007年 / 126卷 / 1-2期

关键词：

hydrotalcite; polyoxometalates; dehydrogenation;

D O I：

10.1016/j.cattod.2006.10.009

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

The acid-base and red-ox properties of amorphous magnesium and zinc molybdates obtained through calcination at 400 degrees C of Mg(2)Al- and Zn(2)Al-heptamolybdate layered double hydroxides, which had been prepared by anionic exchange from the corresponding nitrate -hydrotalcite precursors, have been studied. Lewis-type acid and basic sites have been detected in both systems, in addition to Bronsted-type acid sites in magnesium molybdate; however, as studied by FT-IR spectroscopy, none of them is strong enough to yield propene through isopropanol decomposition. The higher reducibility of Mo(6+) cations in zinc-containing samples than the magnesium containing ones makes them more selective for acetone production. Moreover, a small amount of products formed on basic sites through acetone aldol reaction have been identified at high reaction temperatures. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：153 / 161

页数：9

共 47 条

[1] Mo/γ-Al2O3 catalysts for the oxidative dehydrogenation of propane.: Effect of Mo loading [J].