Pd/CNT-promoted Cu-ZrO2/HZSM-5 hybrid catalysts for direct synthesis of DME from CO2/H-2

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	Pd/CNT-promoted Cu-ZrO2/HZSM-5 hybrid catalysts for direct synthesis of DME from CO2/H-2
	Zhang, Meng-Hui ; Liu, Zhi-Ming ; Lin, Guo-Dong ; Zhang, Hong-Bin ; Zhang HB(张鸿斌)
刊名	http://dx.doi.org/10.1016/j.apcata.2012.10.038
	2013-01-31
关键词	Pd-decorated CNTs Pd-decorated CNT-promoted Cu-ZrO2/HZSM-5 hybrid catalysts CO2 hydrogenation Direct DME synthesis
英文摘要	A type of bi-functional hybrid catalyst of Pd-decorated CNT-promoted Cu-ZrO2 admixed with HZSM-5 zeolite was developed, and displayed excellent performance for the direct synthesis of dimethyl ether (DME) from CO2/H-2 via CH3OH in a single fixed-bed continuous flow reactor. Over a CuZr-PdCNTs/HZSM-5 hybrid catalyst under reaction conditions of 5.0 MPa, 523 K, V(H-2)/V(CO2)/V(N-2) = 69/23/8, GHSV = 25,000 mL(STP)/(h g-hydr. catal.), the observed specific rate of CO2 hydrogenation-conversion reached 0.39 mu mol/(s m(2)-Cu-0-SA), which was 1.22 times that of the corresponding Pd/CNTs-free counterpart CuZr/HZSM-5. The addition of a minor amount of the Pd-decorated CNTs into the CuZr/HZSM-5 host catalyst caused little change in the apparent activation energy for CO2 hydrogenation, but led to an increase of metal Cu exposed area (catalytically active Cu surface-sites closely associated with the CO2 hydrogenation to methanol) and marked improvement of adsorption performance of the catalyst for H-2 and CO2. The latter would help generate a micro-environment with higher concentration of active H and CO2 adspecies at the surface of the functioning catalyst, thus increasing the rate of the surface hydrogenation reactions. The present study also demonstrated that combining the methanol-synthesis and methanol-dehydration-to-DME processes in heterogeneous "one-pot" reactions by using the bifunctional hybrid catalyst could indeed enhance the driving force for CO2 hydrogenation conversion. (C) 2012 Elsevier B.V. All rights reserved.
语种	英语
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/62037]
专题	化学化工－已发表论文
推荐引用方式 GB/T 7714	Zhang, Meng-Hui,Liu, Zhi-Ming,Lin, Guo-Dong,et al. Pd/CNT-promoted Cu-ZrO2/HZSM-5 hybrid catalysts for direct synthesis of DME from CO2/H-2[J]. http://dx.doi.org/10.1016/j.apcata.2012.10.038,2013.
APA	Zhang, Meng-Hui,Liu, Zhi-Ming,Lin, Guo-Dong,Zhang, Hong-Bin,&张鸿斌.(2013).Pd/CNT-promoted Cu-ZrO2/HZSM-5 hybrid catalysts for direct synthesis of DME from CO2/H-2.http://dx.doi.org/10.1016/j.apcata.2012.10.038.
MLA	Zhang, Meng-Hui,et al."Pd/CNT-promoted Cu-ZrO2/HZSM-5 hybrid catalysts for direct synthesis of DME from CO2/H-2".http://dx.doi.org/10.1016/j.apcata.2012.10.038 (2013).