Investigation on gold dispersion of Au/ZrO2 catalysts and activity in the low-temperature WGS reaction

被引：28
作者：
Zane, F.
Trevisan, V.
Pinna, F.
Signoretto, M. [1 ]
Menegazzo, F.
机构：
[1] Univ Ca Foscari, Dipartimento Chim, I-2137 Dorsoduro, Italy
来源：
APPLIED CATALYSIS B-ENVIRONMENTAL | 2009年 / 89卷 / 1-2期
关键词：
Chemisorption; Dispersion; Gold; Sulfated zirconia; Zirconia; WGS reaction; WATER-GAS-SHIFT; ZIRCONIA; NANOPARTICLES; HYDROGEN; SUPPORT; CERIA;
D O I：
10.1016/j.apcatb.2009.02.004
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：
Gold over zirconia and sulfated zirconia catalysts were tested in the water-gas shift (WGS) reaction at temperatures between 423 and 453 K. Samples were characterized by N-2 adsorption analysis, XRD, TPO, TG-DTA and pulse-flow CO chemisorption. A very good linear relationship between catalytic activity and dispersion determinated by chemisorption has been evidenced. Sulfated catalysts showed higher activities than samples over plain zirconia. SO4- do not behave as promoters of the gold active phase, but they yield a larger specific surface area of the zirconia, thus favouring a better dispersion of gold nanoparticles on the support. CO amount at the reactor outlet has been checked and will be discussed. (C) 2009 Elsevier B.V. All rights reserved.
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收藏
页码：303 / 308
页数：6
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