Insights into SnO2 Nanoparticles Supported on Fibrous Mesoporous Silica for CO Catalytic Oxidation

Author:

Li Guobo1,Zhang Yingying1,Yan Jie1,Luo Yiwei1,Wang Conghui2,Feng Weiwei1,Zhang Shule3,Liu Wenming2,Zhang Zehui4,Peng Honggen1ORCID

Affiliation:

1. School of Resources and Environment, Nanchang University, Nanchang 330031, China

2. School of Chemistry and Chemical Engineering, Nanchang University, Nanchang 330031, China

3. School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China

4. School of Chemistry and Materials Science, Central South National University, Wuhan 430074, China

Abstract

A large surface area dendritic mesoporous silica material (KCC-1) was successfully synthesized and used as a support to confine SnO2 nanoparticles (NPs). Owing to the large specific surface area and abundant mesoporous structure of dendritic KCC-1, the SnO2 NPs were highly dispersed, resulting in significantly improved CO catalytic oxidation activity. The obtained Snx/KCC-1 catalysts (x represents the mass fraction of SnO2 loading) exhibited excellent CO catalytic activity, with the Sn7@KCC-1 catalyst achieving 90% CO conversion at about 175 °C. The SnO2 NPs on the KCC-1 surface in a highly dispersed amorphous form, as well as the excellent interaction between SnO2 NPs and KCC-1, positively contributed to the catalytic removal process of CO on the catalyst surface. The CO catalytic removal pathway was established through a combination of in situ diffuse reflectance infrared transform spectroscopy and density-functional theory calculations, revealing the sequential steps: ① CO → CO32−ads, ② CO32−ads → CO2free+SnOx−1, ③ SnOx−1+O2 → SnOx+1. This study provides valuable insights into the design of high-efficiency non-precious metal catalysts for CO catalytic oxidation catalysts with high efficiency.

Funder

National Natural Science Foundation of China

Natural Science Foundation of Jiangxi Province

Hubei Provincial Natural Science Foundation of China

Publisher

MDPI AG

Subject

Physical and Theoretical Chemistry,Catalysis,General Environmental Science

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