高等学校化学学报 ›› 2018, Vol. 39 ›› Issue (8): 1721.doi: 10.7503/cjcu20180118

• 物理化学 • 上一篇    下一篇

金基二元合金团簇Au12M(M=Cu,Pt,Ni)催化水煤气变换反应的理论研究

方镭1, 夏盛杰1(), 薛继龙1, 孟跃2, 钱梦丹1, 罗伟1, 张晓锋1, 倪哲明1()   

  1. 1. 浙江工业大学化学工程学院, 杭州 310014
    2. 湖州师范学院生命科学学院, 湖州 313000
  • 收稿日期:2018-02-09 出版日期:2018-08-10 发布日期:2018-06-04
  • 作者简介:联系人简介: 倪哲明, 女, 博士, 教授, 博士生导师, 主要从事计算化学及纳米无机光催化材料研究. E-mail: jchx@zjut.edu.cn;夏盛杰, 男, 博士, 副教授, 主要从事无机材料及光催化研究. E-mail: xiasj@zjut.edu.cn
  • 基金资助:
    国家自然科学基金(批准号: 21503188)和浙江省自然科学基金(批准号: LQ15B030002)资助.

Catalysis Theoretical Study on Water Gas Shift Reaction of Au-based Binary Alloy Au12M(M=Cu,Pt,Ni)

FANG Lei1, XIA Shengjie1,*(), XUE Jilong1, MENG Yue2, QIAN Mengdan1, LUO Wei1, ZHANG Xiaofeng1, NI Zheming1,*()   

  1. 1. College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China
    2. School of Life Sciences, Huzhou University, Huzhou 313000, China
  • Received:2018-02-09 Online:2018-08-10 Published:2018-06-04
  • Contact: XIA Shengjie,NI Zheming E-mail:xiasj@zjut.edu.cn;jchx@zjut.edu.cn
  • Supported by:
    † Supported by the National Natural Science Foundation of China(No.21503188) and the Natural Science Foundation of Zhejiang Province, China(No.LQ15B030002).

摘要:

利用密度泛函理论(DFT)对Au12M(M=Cu, Pt, Ni) 3种合金团簇的结构稳定性、 热力学稳定性和反应活性进行研究, 并对金基二元合金团簇催化水煤气变换反应(WGSR)的反应机理进行探讨. 研究发现, Au12Ni合金团簇的稳定性及电子活性最优. 考察了WGSR在金基二元合金团簇上的氧化还原机理和羧基机理, 表明Au12Cu合金团簇上WGSR按照氧化还原机理A进行, 水解离后产生的OH*会继续解离为O*和H*(*代表吸附物质); Au12Pt及Au12Ni合金团簇上按照氧化还原机理B进行, 2个OH*发生歧化反应. 比较3种团簇上的最佳反应路径发现, Au12Cu团簇对WGSR表现出较好的催化活性.

关键词: 密度泛函理论, Au12M团簇, 水煤气变换反应, 氧化还原机理, 羧基机理

Abstract:

The structural stability, thermodynamic stability and reactivity of Au12M(M=Cu,Pt,Ni) alloy clusters doped with Cu, Pt and Ni were studied by density functional theory(DFT) calculations. The reaction mechanism of water gas shift reaction(WGSR) in gold-based binary alloy clusters was also discussed. The Au12Ni alloy clusters were found to have the best stability and electron activity. The reaction mechanism of redox mechanism and carboxyl mechanism in gold-based binary alloy clusters was explored. The result shows that the WGSR on the Au12Cu alloy is in accordance with the redox mechanism A, those on Au12Pt and Au12Ni alloy clusters are in accordance with the redox mechanism B. Comparing the optimal reaction path of the three clusters, Au12Cu clusters show the best catalytic activity for WGSR.

Key words: Density functional theory, Au12M cluster, Water gas shift reaction(WGSR), Redox mechanism, Carboxy mechanism

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