Design of a high-performance catalyst for CO oxidation: Au nanoparticles confined in mesoporous aluminosilicate
Resource
Catalysis Today 93-95: 141-147
Journal
Catalysis Today
Journal Volume
93-95
Pages
141-147
Date Issued
2004
Author(s)
Abstract
Au nanoparticles embedded within mesoporous aluminosilicate particles have been prepared and used as catalyst for CO oxidation. In the presence of C 16TMAB, a stable aqueous solution of Au nanoparticles-surfactant without apparent aggregations was obtained by chemical reduction. After combining with aluminosilicates in an alkaline solution, the Au nanoparticles were mostly embedded within the mesoporous aluminosilicate particles, and the maximum loading of Au nanoparticle can reach around 36wt.%. The diameter of Au nanoparticles in mesoporous aluminosilicates are <10nm after calcination at 560°C under air. In this research, the quaternary ammonium surfactants serve as dual function agents, protecting agent for Au nanoparticle and templates for mesoporous silica. When the mesoporous aluminosilicate supports are in micron-size, the highest CO conversion is only about 16% over the catalyst with gold loading, Au/SiO2 = 8%. The conversion decreases to nearly zero at higher gold loadings due to extensive pore blocking. Reducing the dimension of mesoporous aluminosilicates to tens of nanometers makes the Au nanoparticles more accessible for CO oxidation, and the highest CO conversion reaches 70% over the catalyst with gold loading, Au/SiO2 = 24wt.%. © 2004 Elsevier B.V. All rights reserved.
Au nanoparticles embedded within mesoporous aluminosilicate particles have been prepared and used as catalyst for CO oxidation. In the presence of C 16TMAB, a stable aqueous solution of Au nanoparticles-surfactant without apparent aggregations was obtained by chemical reduction. After combining with aluminosilicates in an alkaline solution, the Au nanoparticles were mostly embedded within the mesoporous aluminosilicate particles, and the maximum loading of Au nanoparticle can reach around 36wt.%. The diameter of Au nanoparticles in mesoporous aluminosilicates are <10nm after calcination at 560°C under air. In this research, the quaternary ammonium surfactants serve as dual function agents, protecting agent for Au nanoparticle and templates for mesoporous silica. When the mesoporous aluminosilicate supports are in micron-size, the highest CO conversion is only about 16% over the catalyst with gold loading, Au/SiO2 = 8%. The conversion decreases to nearly zero at higher gold loadings due to extensive pore blocking. Reducing the dimension of mesoporous aluminosilicates to tens of nanometers makes the Au nanoparticles more accessible for CO oxidation, and the highest CO conversion reaches 70% over the catalyst with gold loading, Au/SiO2 = 24wt.%. © 2004 Elsevier B.V. All rights reserved.
SDGs
Type
journal article