Inert Can Be Advantageous: Advisable Reconstruction and Application of Palladium Chloride for the Preferential Oxidation of the Hydrogen Impurity in Carbon Monoxide Streams

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• 作者：Dr. Luyang Qiao ; Dr. Qiaohong Li ; Dr. Zhangfeng Zhou ; Prof. Rui Si and Prof. Yuangen Yao
• 刊名：ChemCatChem
• 出版年：2016
• 出版时间：June 7, 2016
• 年：2016
• 卷：8
• 期：11
• 页码：1909-1914
• 全文大小：1271K
• ISSN：1867-3899

文摘

Preferential oxidation of the H₂ impurity in CO streams is crucial for the catalytic conversion of CO into ethylene glycol. It is uncertain as to whether H₂ can overthrow the dominance of CO and finally lead the reaction. Not only is this a typical research issue, but it is also extremely critical for practical applications. So far, no catalyst has shown selectivity higher than 50 % owing to competitive adsorption of CO. In this work, we report a PdCl_x-based catalyst that can readily overcome the challenge mentioned above. Over this catalyst, the selectivity of H₂ oxidation is promoted by more than 40 % relative to that over the conventional Pd/Al₂O₃ catalyst and reaches a value of 87 %. The turnover frequency of undesired CO oxidation is inhibited by at least one order of magnitude. We found that the reconstructed palladium chloride was highly selective to this reaction by facile inhibition of the adsorption and oxidation of CO.