The promoting effect of Nb2O5 addition to Pd/Al2O3 catalysts on propane oxidation

被引：71

作者：

Noronha, FB ^{[1
]}

Aranda, DAG ^{[1
]}

Ordine, AP ^{[1
]}

Schmal, M ^{[1
]}

机构：

[1] Univ Fed Rio de Janeiro, COPPE, PEQ, NUCAT,Ilha Fundao, BR-21941 Rio De Janeiro, Brazil

来源：

CATALYSIS TODAY | 2000年 / 57卷 / 3-4期

关键词：

propane oxidation; niobium oxide; calcination;

D O I：

10.1016/S0920-5861(99)00337-5

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Pd/Nb2O5/Al2O3 catalysts were investigated on propane oxidation. Diffuse reflectance spectroscopy (DRS) and X-ray photoelectron spectroscopy (XPS) analysis suggested that monolayer coverage was attained between 10 and 20 wt.% of Nb2O5. Temperature programmed reduction (TPR) evidenced the partial reduction of niobium oxide. The maximum propane conversion observed on the Pd/10% Nb2O5/Al2O3 corresponded to the maximum Nb/Al surface ratio. The presence of NbOx polymeric structures near to the monolayer could favor the ideal Pd-0/Pd2+ surface ratio to the propane oxidation which could explain the promoting effect of niobium oxide. (C)2000 Elsevier Science B.V. All rights reserved.

引用

页码：275 / 282

页数：8