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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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Double perovskite oxides Sr_2Mg_(1-x)Fe_xMoO(6-δ) for catalytic oxidation of methane

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Journal of Natural Gas Chemistry 2011年第4期20卷 345-349页

作者： Chen Li Wendong W ang Congying Xu Yuanxu Liu BO He Chusheng Chen caskeylaboratoryofmaterialsforenergyconversion UniversityofScienceandTechnologyofChinaHefei230026AnhuiChina DepartmentofChemicalPhysics UniversityofScienceandTechnologyofChinaHefei230026AnhuiChina NationalSynchrotronRadiationLaboratory UniversityofScienceandTechnoiogvofChinaHefei230029AnhuiChina： Department ofChemistry and Chemical Engineering Huainan Normal UniversityHuainan 232001AnhuiChina

The double perovskite oxides Sr2Mg1-xF exMoO6-δ were investigated as catalysts for the methane *** structural properties of catalysts were characterized in detail by X-ray diffraction,X-ray photoelectron spectroscopy and X-ray absorption *** catalytic property was strongly influenced by the Fe *** relation between catalytic performance and the degree of Fe substitution was examined with regard to the structure and surface characteristics of the mixed *** Fe-containing catalysts exhibited higher activity attributable to the possible（Fe2＋,Mo6＋） and （Fe3＋,Mo5＋）valency pairs,and the highest activity was observed for Sr2Mg0.2Fe0.8MoO6-δ.The enhancement of the catalytic activity may be correlated with the Fe-relating surface lattice oxygen species and was discussed in view of the presence of oxygen vacancies.

关键词： catalytic combustion methane double perovskites Sr2Mg1-xF exMoO6-δ SOFC anode materials

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