Support effect of zinc tin oxide on gold catalyst for CO oxidation reaction

Wei Li ^a, ,
Linying Du ^b ,
Chunjiang Jia ^b ,
Rui Si ^a

a Key Laboratory of Interfacial Physics and Technology, Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, China;
b Key Laboratory for Colloid and Interface Chemistry, Key Laboratory of Special Aggregated Materials, School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, Shandong, China

Received Date: 18 April 2016
Revised Date: 23 May 2016

Fund Project: This work was supported by the National Natural Science Foundation of China (21373259, 21301107), the Hundred Talents Project of the Chinese Academy of Sciences, the Strategic Priority Research Program of the Chinese Academy of Sciences (XDA09030102), the Fundamental Research Funding of Shandong University (2014JC005), the Taishan Scholar Project of Shandong Province (China), and the Open Funding from Key Laboratory of Interfacial Physics and Technology, Chinese Academy of Sciences.

Nanostructured gold catalyst supported on metal oxide is highly active for the CO oxidation reaction. In this work, a new type of oxide support, zinc tin oxide, has been used to deposit 0.7 wt% Au via a deposition-precipitation method. The textural properties of Zn₂SnO₄ support have been tuned by varying the molar ratio between base (N₂H₄·H₂O) and metal ion (Zn²⁺) to be 4/1, 8/1 and 16/1. The catalytic tests for CO oxidation reaction revealed that the reactivity on Au-Zn₂SnO₄ with N₂H₄·H₂O/Zn²⁺=8/1 was the highest, while the reactivity on Au-Zn₂SnO₄ with N₂H₄·H₂O/Zn²⁺=16/1 was almost identical to that of the pure support. Both fresh and used catalysts have been characterized by multiple techniques including nitrogen adsorption-desorption, X-ray diffraction, transmission electron microscopy, high-angle annular dark-field scanning transmission electron microscopy, X-ray photoelectron spectroscopy, X-ray adsorption fine structure, and temperature-programmed reduction by hydrogen. These demonstrated that the textural properties, especially pore volume and pore size distribution, of Zn₂SnO₄ play crucial roles in the averaged size of gold nanoparticles, and thus determine the catalytic activity of Au-Zn₂SnO₄ for CO oxidation.

Support effect of zinc tin oxide on gold catalyst for CO oxidation reaction

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