Surface-Passivated SBA-15-Supported Gold Nanoparticles: Highly Improved Catalytic Activity and Selectivity toward Hydrophobic Substrates

被引:15
作者
Gao, Jinsuo [1 ]
Zhang, Xueying [1 ]
Yang, Yan [1 ]
Ke, Jun [1 ]
Li, Xinyong [1 ]
Zhang, Yaobin [1 ]
Tan, Feng [1 ]
Chen, Jingwen [1 ]
Quan, Xie [1 ]
机构
[1] Dalian Univ Technol, Sch Environm Sci & Technol, Key Lab Ind Ecol & Environm Engn MOE, Dalian 116024, Peoples R China
基金
中国国家自然科学基金;
关键词
gold; mesoporous materials; nanoparticles; reduction; surface chemistry; SULFONIC-ACID FUNCTIONALIZATION; COOPERATIVE CATALYSIS; MCM-41-TYPE SILICA; DIBLOCK COPOLYMER; COMBINED ALKYL; CHIRAL BINOL; AU; NANOSTRUCTURES; ESTERIFICATION; DIETHYLZINC;
D O I
10.1002/asia.201300088
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
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.
引用
收藏
页码:934 / 938
页数:5
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