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	Carbon nanotube-supported Pd-ZnO catalyst for hydrogenation of CO2 to methanol
	Liang, Xue-Lian ; Dong, Xin ; Lin, Guo-Dong ; Zhang, Hong-Bin ; Zhang HB(张鸿斌)
	2008-11
关键词	Carbon nanotubes CNT-supported Pd-ZnO catalyst CO2 hydrogenation Methanol synthesis
英文摘要	A type of Pd-ZnO catalysts supported on multi-walled carbon nanotubes (MWCNTs) were developed, with excellent performance for CO2 hydrogenation to methanol. Under reaction conditions of 3.0 MPa and 523 K, the observed turnover-frequency of CO2 hydrogenation reached 1.15 x 10(-2) s(-1) over the 16%Pd0.1Zn1/CNTs(h-type). This value was 1.17 and 1.13 times that (0.98 x 10(-2) and 0.97 x 10(-2) s(-1)) of the 35%Pd0.1Zn1/AC and 20%Pd0.1Zn1/gamma-Al2O3 catalysts with the respective optimal Pd0.1Zn1-loading. Using the MWCNTs in place of AC or gamma-Al2O3 as the catalyst support displayed little change in the apparent activation energy for the CO2 hydrogenation, but led to an increase of surface concentration of the Pd-0-species in the form of PdZn alloys, a kind of catalytically active Pd-0-species closely associated with the methanol generation. On the other hand, the MWCNT-supported Pd-ZnO catalyst could reversibly adsorb a greater amount of hydrogen at temperatures ranging from room temperature to 623 K This unique feature would help to generate a micro-environment with higher concentration of active H-adspecies at the surface of the functioning catalyst, thus increasing the rate of surface hydrogenation reactions. In comparison with the "Parallel-type (p-type)" MWCNTs, the "Herringbone-type (h-type)" MWCNTs possess more active surface (with more dangling bonds), and thus, higher capacity for adsorbing H-2, which make their promoting action more remarkable. (C) 2008 Elsevier B.V. All rights reserved.; National Natural Science Foundation [20590364]; National Basic Research ("973") Project of China [2005CB221403]
语种	英语
出版者	ELSEVIER SCIENCE BV
内容类型	期刊论文
源URL	[http://dx.doi.org/doi:10.1016/j.apcatb.2008.11.018]
专题	化学化工－已发表论文
推荐引用方式 GB/T 7714	Liang, Xue-Lian,Dong, Xin,Lin, Guo-Dong,et al. Carbon nanotube-supported Pd-ZnO catalyst for hydrogenation of CO2 to methanol[J],2008.
APA	Liang, Xue-Lian,Dong, Xin,Lin, Guo-Dong,Zhang, Hong-Bin,&张鸿斌.(2008).Carbon nanotube-supported Pd-ZnO catalyst for hydrogenation of CO2 to methanol..
MLA	Liang, Xue-Lian,et al."Carbon nanotube-supported Pd-ZnO catalyst for hydrogenation of CO2 to methanol".(2008).

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