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
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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). |
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