Synergistic effect of bimetallic RuPt/TiO_(2) catalyst in methane combustion  

作　　者：Shi-Ying Cao Fan Ye Ni-Ni Zhang Yang-Long Guo Yun Guo Li Wang Sheng Dai Wang-Cheng Zhan 

机构地区：[1]Key Laboratory for Advanced Materials and Research Institute of Industrial Catalysis,School of Chemistry and Molecular Engineering,East China University of Science and Technology,Shanghai,200237,China [2]Key Laboratory for Advanced Materials and Feringa Nobel Prize Scientist Joint Research Centre,Institute of Fine Chemicals,School of Chemistry and Molecular Engineering,East China University of Science and Technology,Shanghai,200237,China

出　　处：《Rare Metals》2023年第1期165-175,共11页稀有金属（英文版）

基　　金：financially supported by National Natural Science Foundation of China(Nos.21922602,22076047 and U21A20326);Shanghai Science and Technology Innovation Action Plan(No.20dz1204200);the Fundamental Research Funds for the Central Universities。

摘　　要：Designing metal compounds based on their structure and chemical composition is essential in achieving desirable performance in methane oxidation,because of the synergistic effect between different metal elements.Herein,a bimetallic Ru-Pt catalyst on TiO_(2) support(RuPt-O/TiO_(2)) was prepared by in situ reduction followed by calcination in air.Compared with monometallic catalysts(Ru-O/TiO_(2) and Pt-O/TiO_(2)),the synergistic effect of mixed metals endowed bimetallic catalysts with excellent stability and outstanding performance in methane oxidation,with a reaction rate of 13.9×10^(-5)mol^(-1)_(CH_(4))·g^(-1)_(Ru+Pt)·s^(-1)at 303℃.The varied characterization results revealed that among the bimetallic catalysts,RuO_(2)was epitaxially grown on the TiO_(2) substrate owing to lattice matching between them,and part of the PtO_(x) adhered to the RuO_(2) surface,in addition to a single PtO_(x) nanoparticle with 4 nm in size.Consequently,Pt mainly existed in the form of Pt2+and Pt4+and a small amount of zero valence in the bimetallic catalyst,prompting the adsorption and activation of methane as the first and rate-controlling step for CH_(4) oxidation.More importantly,the RuO_(2) species provided additional oxygen species to facilitate the redox cycle of the PtO_(x) species.This study opens a new route for structurally designing promising catalysts for CH4oxidation.

关 键 词：Synergistic effect Bimetallic catalyst Methane combustion Redox cycle 

分 类 号：O643.36[理学—物理化学]