期刊
LANGMUIR
卷 37, 期 7, 页码 2341-2348出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.langmuir.0c03216
关键词
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资金
- National Natural Science Foundation of China [NSFC 21976055, 51772010]
- Fundamental Research Funds for the Central Universities [2019 MS047]
- Science and Technology Projects of State Grid Corporation of China
Homogeneously dispersed Au and SnO2 nanoparticles were successfully generated in the confined layer space of layered silicate RUB-15, resulting in the high catalytic activity of the Au-SnO2/SiO2 composite. The interaction between Au and SnO2 NPs increased the electron density around Au NPs, leading to excellent catalytic performance. The study provides a new perspective on the catalysis mechanism to the metal/semiconductor synergistic catalyst system.
With the aid of the confined conversion of layered silicate RUB-15, homogeneously dispersed Au and SnO2 nanoparticles (NPs) were generated in the confined layer space of RUB-15. The Au-SnO2/SiO2 composite was obtained with the structure that ultrafine Au and SnO2 NPs were supported on SiO2 lamellas. Benefited by the Sn(II)-assisted in situ reduction strategy, Au NPs were highly uniformed and evenly distributed in/ on the RUB-15. This Au-SnO2/SiO2 composite was employed as a catalyst to the reduction of 4-nitrophenol showing excellent catalytic activity. The catalytic rate constant at room temperature was calculated to be 6.64 min(-1), which was dramatically higher than that of Au/SiO2 composite produced by reduction with hydrazine hydrate on the same support of layered silicate RUB-15. The interaction between Au and SnO2 NPs increased the electron density around Au NPs, which was demonstrated to be an essential factor to the excellent catalytic activity of the Au-SnO2/SiO2 composite. The simple and universal synthesis method afforded precise control over the size/spatial arrangement of Au and SnO2 NPs on SiO2 lamellas. The high activity of the Au-SnO2/SiO2 composite demonstrated that the strategy used in this study has good potential application prospect. Furthermore, this work provided new perspective on the catalysis mechanism to the metal/semiconductor synergistic catalyst system.
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