Gold catalysts supported on mesoporous zirconia for low-temperature water–gas shift reaction

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• 作者：V. Idakiev ; T. Tabakova ; A. Naydenov ; Z.-Y. Yuan and B.-L. Su
• 关键词：Gold catalysts ; Mesoporous zirconia ; Water– ; gas shift reaction
• 刊名：Applied Catalysis B ; Environmental
• 出版年：2006
• 期刊代码：4_09263373
• 类别：ce
• 出版时间：31 March 2006
• 卷：63
• 期：3-4
• 页码：178-186
• 文件大小：653 K

摘要

Mesoporous ZrO₂ with high surface area and uniform pore size distribution, synthesized by surfactant templating through a neutral [C₁₃(EO)₆–Zr(OC₃H₇)₄] assembly pathway, was used as a support of gold catalysts prepared by deposition–precipitation method. The supports and the catalysts were characterized by powder X-ray diffraction, scanning and transmission electron microscopy, N₂ adsorption analysis, temperature programmed reduction and desorption. The catalytic activity of gold supported on mesoporous zirconia was evaluated in water–gas shift (WGS) reaction at wide temperature range (140–300 °C) and at different space velocities and H₂O/CO ratios. The catalytic behaviour and the reasons for а reversible deactivation of Au/mesoporous zirconia catalysts were studied. The influence of gold content and particle size on the catalytic performance was investigated. The WGS activity of the new Au/mesoporous zirconia catalyst was compared to the reference Au/TiO₂ type A (World Gold Council), revealing significantly higher catalytic activity of Au/mesoporous zirconia catalyst. It is found that the mesoporous zirconia is a very efficient support of gold-based catalyst for the WGS reaction.