Release Time:2019-03-09  Hits:

Indexed by: Journal Article

Date of Publication: 2013-05-01

Journal: CHEMISTRY-AN ASIAN JOURNAL

Included Journals: Scopus、PubMed、EI、SCIE

Volume: 8

Issue: 5

Page Number: 934-938

ISSN: 1861-4728

Key Words: gold; mesoporous materials; nanoparticles; reduction; surface chemistry

Abstract: Silanol groups on a silica surface affect the activity of immobilized catalysts because they can influence the hydrophilicity/hydrophobicity, matter transfer, or even transition state in a catalytic reaction. Previously, these silanol groups have usually been passivated by using surface-passivation reagents, such as alkoxysilanes, bis-silylamine reagents, chlorosilanes, etc., and surface passivation has typically been found in mesoporous-silicas-supported molecular catalysts and heteroatomic catalysts. However, this property has rarely been reported in mesoporous-silicas-supported metal-nanoparticle catalysts. Herein, we prepared an almost-superhydrophobic SBA-15-supported gold-nanoparticle catalyst by using surface passivation, in which the catalytic activity increased more than 14times for the reduction of nitrobenzene compared with non-passivated SBA-15. In addition, this catalyst can selectively catalyze hydrophobic molecules under our experimental conditions, owing to its high (almost superhydrophobic) hydrophobic properties.