Accelerated catalytic activity of Pd NPs supported on amine-rich silica hollow nanospheres for quinoline hydrogenation

被引：95
作者：
Guo, Miao [1 ,2 ]
Li, Can [1 ]
Yang, Qihua [1 ]
机构：
[1] Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, 457 Zhongshan Rd, Dalian 116023, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100039, Peoples R China
来源：
CATALYSIS SCIENCE & TECHNOLOGY | 2017年 / 7卷 / 11期
关键词：
CHEMOSELECTIVE HYDROGENATION; SELECTIVE CATALYSTS; MILD CONDITIONS; NANOPARTICLES; EFFICIENT; SIZE; NANOSTRUCTURES; OXIDATION; CLUSTERS; CARBON;
D O I：
10.1039/c7cy00394c
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Tuning the catalytic performance of metal nanoparticles (NPs) is very important in nanocatalysis. Herein, we report that amine- rich mesoporous silica hollow nanospheres (HS-NH2) synthesized by one-pot condensation could efficiently stabilize ultra-small Pd NPs and also increase the surface electron density of Pd NPs due to the coordinating and electron-donating effects of the amine group. Pd NPs supported on HSNH2 afford TOF as high as 5052 h(-1) in quinoline hydrogenation reaction and are much more active than Pd/C with a TOF of 960 h(-1) as well as most reported solid catalysts. The intrinsic activity of Pd NPs increases as the particle size of Pd decreases, revealing that quinoline hydrogenation is a structure-sensitive reaction. The results of TEM, XPS, CO adsorption and CO stripping voltammetry indicate that the high activity of Pd NPs supported on HS-NH2 is mainly attributed to their ultra-small particle size and high surface electron density. Our primary results demonstrate that the organo-modified silica nanospheres are promising solid supports for modifying the electronic properties of metal NPs supported and consequently tailoring their catalytic functions.
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收藏
页码：2221 / 2227
页数：7
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