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Effect of mn promoter on Structure and Performance of K-Co-Mo Catalyst for Synthesis of Higher Alcohols from CO Hydrogenation

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Chinese Journal of Chemical Physics 2016年第6期29卷 671-680,I0001页

作者： Wei Xie Li-li Ji Ji-long Zhou Hai-bin Pan Jun-fa Zhu Yi Zhang Song Sun Jun Bao Chen Gao NationalSynchrotronRadiationLaboratory CollaborativeInnovationCenterofChemistryforEnergyMaterialsUniversityofScienceandTechnologyofChinaHefei230029China StateKeyLaboratoryofOrganic-InorganicComposites BellingUniversityofChemicalTechnologyBeijing100029China CASKeyLaboratoryofMaterialsforEnergyConversion DepartmentofMaterialsScienceandEngineeringUniversityofScienceandTechnologyofChinaHefei230025China

A series of mn-doped K-Co-Mo catalysts were prepared by a sol-gel method. The catalyst structure was well characterized by X-ray diffraction, N2 physisorption, NH3 temperature- programmed adsorption, in situ diffuse reflectance infrared Fourier transform spectroscopy, and X-ray absorption fine structure spectroscopy. The catalytic performance for higher alcohol synthesis from syngas was measured. It was found that the mn-doped catalysts ex- hibited a much higher activity as compared to the unpromoted catalyst, and in particular the C2＋ alcohol selectivity increased significantly. The distribution of alcohol products de- viated from the Anderson-Schulz-Flory law. The portion of methanol in total alcohol was suppressed remarkably and the ethanol became the predominant product. Characterization results indicated that the incorporation of mn enhanced the interaction of Co and Mo and thus led to the formation of Co-Mo-O species, which was regarded as the active site for the alcohol synthesis. Secondly, the presence of mn reduced the amount of strong acid sites significantly and meanwhile promoted the formation of weak acid sites, which had a positive effect on the synthesis of alcohol. Furthermore, it was found that the incorporation of mn can enhance the adsorption of linear- and bridge-type CO significantly, which contributed to the formation of alcohol and growth of carbon chain and thus increased the selectivity to C2＋OH.

关键词： CO hydrogenation Sol-gel method Mo-based catalyst mn promoter Higheralcohols synthesis

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Effects of K and mn promoters over Fe2O3 on Fischer–Tropsch synthesis

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Journal of Energy Chemistry 2020年第8期29卷 118-127,I0004页

作者： Teng Lv Wei Weng Jing Zhou Dong Gu Wei Xiao School of Resource and Environmental Sciences Hubei International Scientific and Technological Cooperation Base of Sustainable Resource and EnergyWuhan UniversityWuhan 430072HubeiChina The Institute for Advanced Studies Wuhan UniversityWuhan 430072.HubeiChina

Structural and compositional design of core-shell structure is an effective strategy towards enhanced ***,amorphous mnO2 nanosheets and K+-intercalated layered mnO2 nanosheets are controllably assembled over Fe2O3 spindles,in which the mnO2 nanosheets are perpendicularly anchored to the surface of *** a core shell structure contributes to a high specific surface area and abundant pore channels on the surface of *** addition,the existence of K+provides large numbers of basic sites and restrains the formation of unpleasant(Fe1-xmnx)*** from the merits in structure and composition,CO adsorption is enhanced and remaining time of intermediates is prolonged on the surfaces of catalysts during the Fischer–Tropsch synthesis(FTS),facilitating to the formation of active iron carbides and C–C coupling ***,the Fe2O3@K+-mn O2 shows both a high CO conversion of 82.3%and a high C5+ selectivity of 73.1%.The present study provides structural and compositional rationales on design high-performance catalysts towards FTS.

关键词： Fischer–Tropsch synthesis K promoter mn promoter CO conversion C5+selectivity

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