Citation: Bingbing Chen, Xiaobing Zhu, Yidi Wang, Limei Yu, Chuan Shi. Gold stabilized on various oxide supports catalyzing formaldehyde oxidation at room temperature[J]. Chinese Journal of Catalysis, ;2016, 37(10): 1729-1737. doi: 10.1016/S1872-2067(16)62470-1 shu

Gold stabilized on various oxide supports catalyzing formaldehyde oxidation at room temperature

a State Key Laboratory of Fine Chemicals, School of Chemistry, Dalian University of Technology, Dalian 116024, Liaoning, China;
b Laboratory of Plasma Physical Chemistry, Dalian University of Technology, Dalian 116024, Liaoning, China

Received Date: 15 April 2016
Revised Date: 21 May 2016

Fund Project: This work was supported by the National Natural Science Foundation of China (21373037, 21577013), China Postdoctoral Science Foundation (2014M560201), and the Fundamental Research Funds for the Central Universities (DUT15TD49, DUT16ZD224).

Gold stabilized on reducible oxide (CeO₂ and FeO_x) and irreducible oxide (γ-Al₂O₃, SiO₂, and HZSM-5) were prepared by deposition precipitation method and tested for catalytic oxidation of formaldehyde (HCHO) at room temperature under high GHSV of 600000 ml/(g·s). Au/γ-Al₂O₃ catalyst showed distinctive catalytic performance, presenting the highest initial HCHO conversion and stability. Correlating the reaction rate with Au particle size, there is a linear relationship, suggesting that the smaller Au particle size with higher dispersion possesses high reactivity for HCHO oxidation. All the catalysts deactivated at high GHSV (600000 ml/(g·s)), but in a quite different rate. Reducible oxide (CeO₂ and FeO_x) could stabilize gold through O linkage and therefore exhibits a better stability for HCHO oxidation reaction. However, the aggregation of gold particles occurred over Au/SiO₂ and Au/HZSM-5 catalysts, which result in the fast deactivation. Therefore, our results suggest that the reducibility of the supports for Au catalysis has no direct influence on the activity, but affects the catalytic stability.
- Gold catalyst,
- Oxide support,
- Formaldehyde oxidation,
- Reducibility,
- Catalytic stability
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