An efficient Ni-Mo-K sulfide catalyst doped with CNTs for conversion of syngas to ethanol and higher alcohols

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	An efficient Ni-Mo-K sulfide catalyst doped with CNTs for conversion of syngas to ethanol and higher alcohols
	Wang, Ji-Jie ; Xie, Jian-Rong ; Huang, Yan-Hui ; Chen, Bing-Hui ; Lin, Guo-Dong ; Zhang, Hong-Bin ; Chen BH(陈秉辉) ; Zhang HB(张鸿斌)
刊名	http://dx.doi.org/10.1016/j.apcata.2013.08.026
	2013
关键词	Carbon dioxide Ethanol Hydrogen Hydrogenation Multiwalled carbon nanotubes (MWCN) Nickel Sulfur compounds Synthesis (chemical) Synthesis gas
英文摘要	A type of Ni-Mo-K sulfide catalyst doped with CNTs for conversion of syngas to ethanol and higher alcohols was developed, and displayed high activity and selectivity for direct synthesis of C1-4-alcohols, especially ethanol, from syngas. Over a Ni0.5Mo1K0.5- 15%CNTs catalyst under the reaction conditions of 8.0 MPa and 593 K, the S(total oxy.) reached 64.1% (CO2-free), with the corresponding STY(total oxy.) being 113 mg h-1 g-1. Ethanol was the dominant product, with S(EtOH) and STY(EtOH) reaching 33.1% (CO2-free) and 55.6 mg h-1 g-1, respectively. This STY(EtOH)-value was 1.47 times that (37.9 mg h-1 g-1) of the CNTs-free counterpart under the same reaction conditions. Addition of a minor amount of CNTs to the sulfurized Ni0.5Mo1K0.5 catalyst caused little change in the Ea for the hydrogenation-conversion of syngas. Appropriately reducing CNT's grain-size could improve its capability to adsorb hydrogen, thus increasing CO hydrogenation-conversion, yet did not influence selectivity of the products. The present work demonstrated that CNTs as promoter function through their adsorbing/activating H2 to generate a surface micro-environment with higher stationary-state concentration of H-adspecies on the functioning catalyst. This resulted in a dramatic increase, at the surface of the functioning catalyst, of the molar percentage of catalytically active Mo4+/Mo5+ species in the total amounts of surface Mo. On the other hand, those active H-species adsorbed at the CNTs surface could be readily transferred to NiiMojK k active sites via the CNT-assisted hydrogen spillover. The aforementioned two factors both were conducive to increasing the rate of hydrogenation conversion of syngas. ? 2013 The Authors.
语种	英语
出版者	Elsevier
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/89191]
专题	化学化工－已发表论文
推荐引用方式 GB/T 7714	Wang, Ji-Jie,Xie, Jian-Rong,Huang, Yan-Hui,et al. An efficient Ni-Mo-K sulfide catalyst doped with CNTs for conversion of syngas to ethanol and higher alcohols[J]. http://dx.doi.org/10.1016/j.apcata.2013.08.026,2013.
APA	Wang, Ji-Jie.,Xie, Jian-Rong.,Huang, Yan-Hui.,Chen, Bing-Hui.,Lin, Guo-Dong.,...&张鸿斌.(2013).An efficient Ni-Mo-K sulfide catalyst doped with CNTs for conversion of syngas to ethanol and higher alcohols.http://dx.doi.org/10.1016/j.apcata.2013.08.026.
MLA	Wang, Ji-Jie,et al."An efficient Ni-Mo-K sulfide catalyst doped with CNTs for conversion of syngas to ethanol and higher alcohols".http://dx.doi.org/10.1016/j.apcata.2013.08.026 (2013).