Characterization and activity of vanadia-promoted Pt/ZrO2 Catalysts for the water-gas shift reaction

被引：6
作者：
Nguyen-Thanh, Danh [1 ]
Duarte de Farias, Andrea M. [1 ]
Fraga, Marco A. [1 ]
机构：
[1] Inst Nacl Tecnol MCT, Lab Catalise, BR-20081312 Rio De Janeiro, Brazil
来源：
CATALYSIS TODAY | 2008年 / 138卷 / 3-4期
关键词：
WGS; Fuel cell; VOx; Zirconia;
D O I：
10.1016/j.cattod.2008.05.036
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
Pt/ZrO2 catalysts for the water-gas shift (WGS) were promoted with various amounts of vanadia. Analyses by XRD, N-2 adsorption, Raman, and UV-vis DRS showed that vanadia is present below monolayer coverage as monovanadate and polyvanadate, with the former dominating at lower loadings, and that following monolayer formation, VO5 species appear, with the eventual generation of V2O5 and ZrV2O7 fora vanadia weight loading of 13%. Though in all cases vanadia induced an enhancement in WGS activity, the best catalyst, that contained 3 wt.% of vanadia, gave a rate that was nearly double that of the unpromoted Pt/ZrO2. That superior global activity probably results from the monovanadate that is the main species at low loadings. It is believed that monovanadate promotes the WGS by rendering the support's surface more oxidizing through its V-O-Zr bonds. (C) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码：235 / 238
页数：4
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