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题名: Bimetallic Au-Pd Nanoparticles Confined in Tubular Mesoporous Carbon as Highly Selective and Reusable Benzyl Alcohol Oxidation Catalysts
作者: Hao, Yan1;  Hao, Guang-Ping1;  Guo, De-Cai1;  Guo, Chun-Zao1;  Li, Wen-Cui1;  Li, Ming-Run2;  Lu, An-Hui1
关键词: carbon ;  mesoporous materials ;  nanoparticles ;  oxidation ;  transition metals
刊名: CHEMCATCHEM
发表日期: 2012-10-01
DOI: 10.1002/cctc.201200207
卷: 4, 期:10, 页:1595-1602
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical
研究领域[WOS]: Chemistry
英文摘要: Size-uniform and highly dispersed bimetallic AuPd nanoparticles were formed in situ and confined in tubular mesoporous carbon by successive incipient wetness impregnation and a thermal annealing method. The bimodal mesoporous carbon (CMK-5) encapsulated AuPd nanoparticles with 1 wt?% metal loading enables superior activity compared with mono-modal mesoporous carbon for benzyl alcohol oxidation. A conversion of >99?% and selectivity of >99?% can be reached within 3 h under mild conditions, for example, at 80?degrees C and at atmospheric pressure. It is found that during the catalyst preparation, the Au and Pd precursor impregnation sequence is a key factor to the formation of AuPd nanoparticles under identical conditions. A relatively high activity is realized by the first impregnation of the Au precursor, followed by the second impregnation of the Pd precursor. The crystalline structure and distribution of AuPd nanoparticles are characterized by high-resolution transmission electron microscopy (HRTEM), energy-dispersive X-ray spectroscopy (EDX), and XRD. It is found that a larger proportion of surface-exposed Pd atoms in AuPd nanoparticles have a positive effect on catalytic activity. The AuPd nanoparticles have a narrow size distribution that is concentrated at approximately 4 nm. TEM and N2 adsorption results reveal that the catalyst has a large surface area and well-developed bimodal pore interconnectivity, which contribute to its excellent activity. The used catalyst retained a high selectivity but conversion decreased with recycling. The deactivation mechanism was attributed to the tiny amount of incompletely removed benzaldehyde adsorbed onto the active surface, which blocked access from the active sites to benzyl alcohol. Importantly, the used catalyst can be recovered by a simple heat treatment at 200?degrees C in air after the catalytic cycles have completed; the adsorbed benzaldehyde is removed from the active surface. Hence, AuPd nanoparticles confined in tubular mesoporous carbon can be used as an alternative method to develop highly dispersed nanocatalysts to improve catalytic efficiency.
关键词[WOS]: LIQUID-PHASE OXIDATION ;  SOLVENT-FREE OXIDATION ;  STRUCTURAL-ANALYSIS ;  METHANOL OXIDATION ;  HYDROGEN-PEROXIDE ;  AEROBIC OXIDATION ;  MOLECULAR-SIEVES ;  PORE SYSTEM ;  REDUCTION ;  CLUSTERS
语种: 英语
WOS记录号: WOS:000309396800016
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/143060
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Dalian Univ Technol, Fac Chem Environm & Biol Sci & Technol, Sch Chem Engn, State Key Lab Fine Chem, Dalian 116024, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China

Recommended Citation:
Hao, Yan,Hao, Guang-Ping,Guo, De-Cai,et al. Bimetallic Au-Pd Nanoparticles Confined in Tubular Mesoporous Carbon as Highly Selective and Reusable Benzyl Alcohol Oxidation Catalysts[J]. CHEMCATCHEM,2012,4(10):1595-1602.
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