Effect of Ag addition on the properties of Pd-Ag/TiO2 catalysts containing different TiO2 crystalline phases

被引：40

作者：

Kontapakdee, Kunyaluck ^{[1
]}

Panpranot, Joongjai ^{[1
]}

Praserthdam, Piyasan ^{[1
]}

机构：

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

来源：

CATALYSIS COMMUNICATIONS | 2007年 / 8卷 / 12期

关键词：

Pd/TiO2; Pd-Ag/TiO2; selective acetylene hydrogenation; crystalline phase;

D O I：

10.1016/j.catcom.2007.03.003

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：

Anatase and rutile TiO2 were used for preparation of the TiO2 supported Pd and Pd-Ag catalysts for selective hydrogenation of acetylene. It was found that Pd/TiO2-anatase exhibited higher acetylene conversion and ethylene selectivity than rutile TiO2 supported ones. However. addition of Ag to Pd/TiO2-anatase catalyst resulted in lower ethylene selectivity while that of Pd/TiO2-rutile increased. It is suggested that Ag addition suppressed the beneficial effect of the Ti3+ sites presented on the anatase TiO2 during selective acetylene hydrogenation whereas without Ti3+, Ag promoted ethylene selectivity by blocking sites for over-hydrogenation of ethylene to ethane. (c) 2007 Elsevier B.V. All rights reserved.

引用

收藏

页码：2166 / 2170

页数：5

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