Citation: SHEN Xian-Rong, MENG Yue, XIA Sheng-Jie. Water Gas Shift Reaction Catalyzed by AuCu Alloy Nanoparticles Supported on Layered Double Hydroxides: Catalytic Performance and Structural Composition[J]. Chinese Journal of Inorganic Chemistry, ;2019, 35(7): 1239-1247. doi: 10.11862/CJIC.2019.159 shu

Water Gas Shift Reaction Catalyzed by AuCu Alloy Nanoparticles Supported on Layered Double Hydroxides: Catalytic Performance and Structural Composition

1.
School of Biological and Chemical Engineering, Anhui Polytechnic University, Wuhu, Anhui 241000, China
2.
School of Life Sciences, Huzhou University, Huzhou, Zhejiang 313000, China
3.
College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China

Corresponding author: XIA Sheng-Jie, xiasj@zjut.edu.cn
Received Date: 30 March 2019
Revised Date: 15 May 2019

Figures(5)

Au nanoparticles supported on layered double hydroxides (Au/LDHs) and AuCu alloy nanoparticles supported on layered double hydroxides (AuCu/LDHs) based on ZnAl layered double hydroxides (ZnAl-LDHs) were synthesized and used for catalyzing water gas shift reaction (WGSR). The structure and composition of Au/LDHs and AuCu/LDHs was characterized and confirmed by using X-ray powder diffraction (XRD), high resolution transmission electron microscopy (HRTEM) and scanning and transmission electron microscope (STEM). The effect of different molar ratios of Au and Cu (n_Au:n_Cu) for AuCu/LDHs onto the catalytic performance of WGSR was investigated and compared with the activity from Au/LDHs. It indicates that Au/LDHs has obviously higher activity compared to plain LDHs, while, AuCu alloy supporting can further largely enhance the catalytic activity for WGSR. Au₂Cu₁/LDHs (n_Au:n_Cu=2:1) exhibited the best catalytic efficiency:activity was 207.1 μmol·g_cat^-1·s^-1, TOF was 1.79 s^-1, and activity energy was 31.1 kJ·mol^-1. The effect of n_Au:n_Cu onto the Au particle size, Au dispersity, coverage degree of Au, and catalytic activity was discussed based on the comparison of physicochemical properties for different catalysts. The active species of Au/LDHs and AuCu/LDHs with different n_Au:n_Cu were analyzed and compared by X-ray photoelectron spectrometry (XPS). It was found that the introduction of the secondary element increased the percentage of Au^δ+ (Au₂Cu₁/LDHs had the highest Au^δ+ content), which maybe resulted in the enhancement of WGSR activity.
- AuCu alloy,
- supporting,
- layered double hydroxides,
- water gas shift reaction,
- catalyst composition,
- reaction activity
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