Characterisations of Pd-Ag/Al2O3 catalysts for selective acetylene hydrogenation:: effect of pretreatment with NO and N2O

被引：63

作者：

Ngamsom, B ^{[1
]}

Bogdanchikova, N

Borja, MA

Praserthdam, P

机构：

[1] Chulalongkorn Univ, Fac Engn, Dept Chem Engn, Ctr Excellence Catalysis & Catalyt React Engn, Bangkok 10330, Thailand

[2] Univ Nacl Autonoma Mexico, Ctr Ciencias Mat Condensada, Ensenada 22800, Baja California, Mexico

来源：

CATALYSIS COMMUNICATIONS | 2004年 / 5卷 / 05期

关键词：

Pd-Ag/Al2O3; acetylene hydrogenation; pretreatment; NO; N2O; TPR; TPD; IR;

D O I：

10.1016/j.catcom.2004.02.007

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：

This contribution concerns the surface characterisation of the Pd-Ag/Al2O3 catalyst for the selective hydrogenation of acetylene. It is shown that, by means of the temperature programmed reduction (TPR) and temperature programmed desorption (TPD), it is possible to view the surface Pd sites of the catalyst prior to pretreatment with NO or N2O, as well as seeing the effect of Ag addition. It is shown that hydrogen adsorption on the palladium is effectively inhibited by the presence of Ag. The role of pretreatment on the activity and ethylene gain enhancement reported in our previous communication is investigated by employing transmission infrared spectroscopy. Strong adsorption of nitrate or nitrite species on Pd surface was observed from NO and N2O pretreatment, resulting in the blockage of Pd sites responsible for direct ethane formation. Accordingly, higher ethylene gain from NOx-treated catalysts was seen over the untreated catalyst. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：243 / 248

页数：6

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