Alumina contribution to CO oxidation: A TPR and IR study

被引：24

作者：

Ammendola, P. ^{[1
]}

Barbato, P. S. ^{[1
]}

Lisi, L. ^{[1
]}

Ruoppolo, G. ^{[1
]}

Russo, G. ^{[2
]}

机构：

[1] CNR, Ist Ric Combust, I-80125 Naples, Italy

[2] Univ Naples Federico II, Dipartimento Ingn Chim, Naples, Italy

来源：

SURFACE SCIENCE | 2011年 / 605卷 / 19-20期

关键词：

Alumina; CO oxidation; Hydroxyls; Platinum catalysts; Copper catalysts; SOLID ACIDIC CATALYSTS; WATER-GAS CONVERSION; CARBON-MONOXIDE; SHIFT REACTION; ACTIVE-SITES; ADSORPTION; DRIFTS; DFT;

D O I：

10.1016/j.susc.2011.06.018

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 alumina contribution to CO oxidation in the absence of O-2 on metal oxide supported catalysts was investigated by CO TPR and in-situ FTIR and DRIFT studies up to 800 degrees C. These tests were performed on two Al2O3 supported catalysts (1 wt.% Pt/La/gamma-Al2O3 and 8 wt.% Cu/gamma-Al2O3) and on two corresponding alumina supports (5 wt.% La2O3 stabilised gamma-Al2O3 and high mechanical resistant spherical gamma-Al2O3 particles). The quantitative determination of CO consumption and CO2 and H-2 formation on the alumina supports was in agreement with a WGS reaction occurring between surface OH and CO with a predominantly 2:1 stoichiometry. In the CO TPR of metal oxide supported catalysts, in addition to the reduction of the metal, a WGS reaction took place with enhanced kinetics. This enhancement was the result of a CO spillover phenomenon from the metal to alumina hydroxyls. This phenomenon significantly affected the evaluation of the reduction degree of the supported metal and could not be neglected in the subsequent calculations. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：1812 / 1817

页数：6

共 23 条

[1] ACTIVE-SITES OF SOLID ACIDIC CATALYSTS .2. WATER-GAS CONVERSION ON ALUMINA AND SOME OTHER CATALYSTS [J].