期刊
CATALYSIS TODAY
卷 400-401, 期 -, 页码 66-72出版社
ELSEVIER
DOI: 10.1016/j.cattod.2021.11.013
关键词
Catalytic combustion; oxidation of methane; Core-shell structure; CO-FTIR; Hydrothermal stability; Zeolite
资金
- INPC, National magnetic confinement fusion energy R & D projects in China [2017YFE0301601]
- International Scientific Cooperation Projects of key R & D Programs in Shanxi Province, China [201803D421101]
Supported palladium catalysts have shown promise for the combustion/oxidation of unburned methane. In this study, core-shell Pd@silicalite-1 catalysts were synthesized and CO-FTIR method was used to probe the completeness of the zeolite shell. The Pd@S-x (x = 1.5, 2.0) catalysts exhibited excellent stability in practical wet conditions.
Supported palladium is the most promising catalyst for catalytic combustion/oxidation of unburned methane generated in vehicles and thermal power generation. The development of a stable catalyst in the presence of high concentrations of water vapor is a challenging task. Herein, core-shell Pd@silicalite-1 catalysts were synthesized with a two-step seed-directed hydrothermal growth method. Firstly, we demonstrate that Fourier transform infrared spectroscopy of CO adsorption (CO-FTIR) is a facile, sensitive, and definite method to probe the completeness of the zeolite shell for metal@zeolite materials. CO-FTIR method is based on the CO access to metal surface because the structure directing agent (SDA) retained in the pores of zeolite shell in the fresh metal@zeolite materials will block the transport of CO. More importantly, for catalysts with complete shell, Pd@S-x (x = 1.5, 2.0) catalyst show no deactivation for 200 h in practical wet conditions (10% H2O, 500 degrees C). To the best of our knowledge, this is one of the scare Pd catalysts which show 200 h stability in these practical conditions. Pd@S-2.0 shows negligible low temperature water absorption which lead to its high catalytic stability in wet conditions.
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