Poison Tolerance to the Selective Hydrogenation of Cinnamaldehyde in Water over an Ordered Mesoporous Carbonaceous Composite Supported Pd Catalyst

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	Poison Tolerance to the Selective Hydrogenation of Cinnamaldehyde in Water over an Ordered Mesoporous Carbonaceous Composite Supported Pd Catalyst
	Chen, Shangjun ; Meng, Li ; Chen, Bingxu ; Chen, Wenyao ; Duan, Xuezhi ; Huang, Xing ; Zhang, Bingsen ; Fu, Haibin ; Wan, Ying
刊名	ACS CATALYSIS
	2017-03-01
卷号	7 期号:3 页码:2074-2087
关键词	C-modified Pd hydrogenation poison tolerance thermal reduction
ISSN号	2155-5435
通讯作者	Wan, Y (reprint author), Shanghai Normal Univ, Shanghai Key Lab Rare Earth Funct Mat, Minist Educ, Key Lab Resource Chem, Shanghai 200234, Peoples R China. ; Wan, Y (reprint author), Shanghai Normal Univ, Dept Chem, Shanghai 200234, Peoples R China.
中文摘要	A coordination-assisted pyrolysis procedure was adopted to encapsulate palladium (Pd) nanoparticles in a mesoporous carbonaceous matrix. X-ray diffraction and transmission electron microscopy measurements revealed that approximately 2.5 nm nanoparticles were highly dispersed inside the well-ordered porous framework. High-resolution TEM and temperature-programmed hydride decomposition analysis demonstrated the formation of interstitial carbon in the Pd lattice. Diffuse reflectance infrared Fourier transform spectroscopy indicated that carbon species could be deposited on low-coordinated surface sites of the Pd particles. This catalyst exhibited high activity in the selective hydrogenation of cinnamaldehyde (CAL) at 80 degrees C under an H-2 pressure of 1.0 MPa (turnover frequency (TOF) of 2.4 s(-1)) to produce hydrocinnamyl aldehyde with high selectivity (HCAL; approximately 80%) in water and could be reused eight times with no dear activity loss. A trapping agent poisoning experiment using solid SH-SBA-15 revealed unobvious leaching of Pd into the solution. Exposure to thiourea with a S:Pd ratio of 0.1 resulted in slight activity and undetectable selectivity losses over the current catalyst in the selective hydrogenation of CAL at 80 degrees C under an H2 pressure of 1.0 MPa. However, a 50% activity loss was observed for commercial Pd/C. Even after an increase in the thiourea concentration to a S:Pd ratio of 3, the TOF remained at 1.9 s(-1) with a negligible effect on the HCAL selectivity. Nearly complete deactivation of Pd/C occurred upon high exposure to thiourea. DFT calculations showed that the presence of surface or subsurface carbon can enhance the poison tolerance of the encapsulated Pd catalysts. The enhanced hydrogenation activity and strong poison tolerance are consistent with the interpretation that Pd nanoparticles are modified by carbonaceous deposits.
学科主题	Chemistry, Physical
收录类别	SCI
资助信息	State Key Basic Research Program of China [2013CB934102]; NSF of China [21322308]; Ministry of Education of China [PCSIR-T_IRT_16R49, 20123127110004]; International Joint Laboratory on Resource Chemistry of China (IJLRC); Shanghai Sci. & Tech. and Edu. Committee [14YF1409200]
语种	英语
公开日期	2017-08-17
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/78262]
专题	金属研究所_中国科学院金属研究所
推荐引用方式 GB/T 7714	Chen, Shangjun,Meng, Li,Chen, Bingxu,et al. Poison Tolerance to the Selective Hydrogenation of Cinnamaldehyde in Water over an Ordered Mesoporous Carbonaceous Composite Supported Pd Catalyst[J]. ACS CATALYSIS,2017,7(3):2074-2087.
APA	Chen, Shangjun.,Meng, Li.,Chen, Bingxu.,Chen, Wenyao.,Duan, Xuezhi.,...&Wan, Ying.(2017).Poison Tolerance to the Selective Hydrogenation of Cinnamaldehyde in Water over an Ordered Mesoporous Carbonaceous Composite Supported Pd Catalyst.ACS CATALYSIS,7(3),2074-2087.
MLA	Chen, Shangjun,et al."Poison Tolerance to the Selective Hydrogenation of Cinnamaldehyde in Water over an Ordered Mesoporous Carbonaceous Composite Supported Pd Catalyst".ACS CATALYSIS 7.3(2017):2074-2087.