文献类型：期刊文献

英文题名：Insight into promotion effect of platinum on CH4 catalytic combustion performance of La0.9AlOx supported Pd-Pt bimetal catalysts

作者：Yu, Jihang[1];Chen, Wei[1];Ding, Min[1];Guo, Yanglong[1];Guo, Yun[1];Wang, Li[1];Dai, Sheng[2,3,4];Wang, Aiyong[1];Zhan, Wangcheng[1,4]

机构：[1]East China Univ Sci & Technol, Res Inst Ind Catalysis, Sch Chem & Mol Engn, State Key Lab Green Chem Engn & Ind Catalysis, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Inst Fine Chem, Sch Chem & Mol Engn, Key Lab Adv Mat, Shanghai 200237, Peoples R China;[3]East China Univ Sci & Technol, Inst Fine Chem, Feringa Nobel Prize Scientist Joint Res Ctr, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China;[4]East China Univ Sci & Technol, Frontiers Sci Ctr Materiobiol & Dynam Chem, Shanghai 200237, Peoples R China

年份：2025

卷号：43

期号：8

起止页码：1652

外文期刊名：JOURNAL OF RARE EARTHS

收录：;EI(收录号：20252518634827);WOS:【SCI-EXPANDED(收录号:WOS:001550409700008)】；

语种：英文

外文关键词：Pd based catalyst; Pd-Pt bimetal; Methane combustion; Water resistance; Perovskites; Rare earths

摘要：Pd-based catalysts have been extensively studied in the catalytic oxidation of methane, but their longterm stability and water resistance are unsatisfactory as the active sites are susceptible to water toxicity. The addition of Pt to Pd-based catalysts is found to be the most effective and promising method. However, distinct states of existence of Pt can affect the catalytic performance to different degrees, even negatively. Therefore, the impact mechanism of Pt on Pd-based catalysts needs to be further understood. In this work, A-site defective La0.9AlOx perovskite was used as a support, and the state of Pt in catalysts was regulated by adjusting the introducing sequence of Pd and Pt. It is found that only when Pt is introduced preferentially, the activity and water resistance of the bimetal can be improved. Combining a series of characterization results of the fresh catalysts, reduced catalysts, and the samples after reduction and use, it is found that the higher Pt2+ content in the catalyst is the main reason for promoting bimetallic properties, while more Pt0 has an inhibitory effect. This work provides a new understanding of the promotion effect of Pt on Pd-Pt bimetal in the catalytic oxidation reaction of methane. (c) 2024 Chinese Society of Rare Earths. Published by Elsevier B.V. All rights are reserved, including those for text and data mining, AI training, and similar technologies.