Promotion effect of Sn in alumina-supported Pt catalysts for CO-PROX

被引：22

作者：

Ayastuy, J. L. ^{[1
]}

Gonzalez-Marcos, M. P. ^{[1
]}

Gutierrez-Ortiz, M. A. ^{[1
]}

机构：

[1] Univ Basque Country, Chem Technol Environm Sustainabil Grp, Dept Chem Engn, Fac Sci & Technol, Bilbao 411080, Spain

来源：

CATALYSIS COMMUNICATIONS | 2011年 / 12卷 / 10期

关键词：

Pt-Sn/Al(2)O(3); CO-PROX; Selectivity; CO yield; Operation window; Bimetallic catalyst; FUEL-CELL APPLICATIONS; NAPHTHA REFORMING CATALYSTS; LOW-TEMPERATURE OXIDATION; PREFERENTIAL OXIDATION; PT-SN/AL2O3; CATALYSTS; CARBON-MONOXIDE; PT/GAMMA-AL2O3; BIMETALLIC PT-SN/AL2O3; SELECTIVE OXIDATION; SURFACE-REACTION;

D O I：

10.1016/j.catcom.2011.02.011

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：

In this work we have studied the effect of the addition of Sn to alumina-supported Pt catalysts towards the catalytic performance in CO-PROX reaction. Monometallic Pt and Sn catalysts supported on alumina, and bimetallic Pt Sn supported on alumina (with Pt/Sn atomic ratios of 1.92, 0.53 and 0.28) was prepared by successive impregnation, with high dispersion of the metal. The addition of Sn to Pt does not substantially increase the activity in CO-PROX at low temperatures; however, the temperature interval where the CO conversion is maximum was significantly increased. The optimum Pt/Sn atomic ratio was found to be 0.53. In a wide operation window with respect to temperature, the catalyst with optimum Pt to Sn ratio shows a maximum CO conversion of 78% for lambda = 2 with constant selectivity (about 40%) and with 31%CO yield. In the presence of either CO(2) or H(2)O the performance of Sn promoted catalyst was seen to show improved activity. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：895 / 900

页数：6

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