Enhancing the catalytic activity of Ru NPs deposited with carbon species in yolk-shell nanostructures

被引：27
作者：
Guo, Miao [1 ,2 ]
Lan, Guojun [3 ]
Peng, Juan [1 ,2 ]
Li, Mingrun [1 ]
Yang, Qihua [1 ]
Li, Can [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
[3] Zhejiang Univ Technol, Inst Ind Catalysis, Hangzhou 310014, Zhejiang, Peoples R China
来源：
JOURNAL OF MATERIALS CHEMISTRY A | 2016年 / 4卷 / 28期
关键词：
PERIODIC MESOPOROUS ORGANOSILICA; RUTHENIUM NANOPARTICLES; BIMETALLIC CATALYSTS; SILICA MICROSPHERES; AU NANOPARTICLES; HYDROGENATION; FABRICATION; TOLUENE; CORE; GOLD;
D O I：
10.1039/c6ta03576k
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：
The synthesis of metal NPs with a well-defined size, shape and composition provides opportunities for tuning the catalytic performance of metal NPs. However, the presence of a stabilizer on the metal surface always blocks the active sites of metal NPs. Herein, we report an efficient method to remove the stabilizer on the metal surface via H-2 pyrolysis with Ru-poly(amindoamine) encapsulated in silica-based yolk-shell nanostructures as an example. The CO uptake amount of Ru NPs increases sharply after H-2 pyrolysis, indicating that the exposure degree of Ru NPs is increased. No aggregation of the colloidal Ru NPs occurs after H-2 pyrolysis, which could be mainly assigned to the protection effect of C and N species formed on Ru NPs. The overall activity of Ru NPs in the yolk-shell nanostructure after the pyrolysis could reach as high as 20 300 mmol per mmol Ru per h in the hydrogenation of toluene, which is much higher than that of most reported Ru-based solid catalysts. It was found that the yolk-shell nanostructure could efficiently prevent the leaching of Ru NPs during the catalytic process. Ru NPs in the yolk-shell nanostructure could also catalyze the hydrogenation of benzoic acid and Levulinic acid with high activity and selectivity.
引用
收藏
页码：10956 / 10963
页数：8
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