Citation: ZHANG Lian-Yang, SHI Wei, XIA Sheng-Jie, NI Zhe-Ming. Hydrodesulfurization Mechanisms of Thiophene Catalyzed by Au/Pd(111) Bimetallic Surfa[J]. Acta Physico-Chimica Sinica, ;2014, 30(10): 1847-1854. doi: 10.3866/PKU.WHXB201407141 shu

Hydrodesulfurization Mechanisms of Thiophene Catalyzed by Au/Pd(111) Bimetallic Surfa

1.
Laboratory of Advanced Catalytic Materials, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310032, P. R. China

Received Date: 3 June 2014
Available Online: 14 July 2014

The formation energy of different ensembles on Pd(111) surfaces containing N (N=1-4) Au atoms were investigated using a density functional theory model. The best model for exploring the adsorption of thiophene was selected, and the mechanism of competitive hydrodesulfurization on a Au/Pd(111) bimetallic surface was investigated. The results showed that Au/Pd(111) has the lowest formation energy, and adsorption at the hexa nal close-packed site is most stable when the thiophene plane is tilted at 30° to the Au/Pd(111) bimetallic surface with S atom. The reactions are exothermic, and desulfurization can be either direct or indirect. The direct desulfurization pathway has a low activation energy, but it is difficult to control the products. The indirect desulfurization pathway is the best fit for the cis-hydrogenation process; C―S cleavage has the highest reaction energy barrier, and is the rate-determining step. The activation energy barrier of the rate-determining step on Au/Pd(111) is lower than those on Au(111) and Pd(111). This indicates that bimetallic AuPd is more active than single Au and Pd in the hydrodesulfurization of thiophene.
- Density functional theory,
- Thiophene,
- Au/Pd(111) bimetallic surface,
- Adsorption,
- Hydrodesulfurization
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