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Potassium-decorated active carbon supported co-mo-based catalyst for water-gas shift reaction

Journal of Natural Gas Chemistry 2011年第1期20卷 77-83页

作者： Yixin Lian RuiFen Xiao Weiping Fang Yiquan Yang National Engineering Laboratory for Green Chemical Productions of Alcohols Ethers and Esters College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 Fujian China Minnan Science and Technology Institute Fujian Normal University Quanzhou 362332 Fujian China

The effect of potassium-decoration was studied on the activity of water-gas shift （WGS） reaction over the co-mo-based catalysts supported on active carbon （AC）, which was prepared by incipient wetness co-impregnation method. The decoration of potassium on active carbon in advance enhances the activities of the como-K/AC catalysts for WGS reaction. Highest activity （about 92% conversion） was obtained at 250 ？ C for the catalyst with an optimum K 2 O/AC weight ratio in the range from 0.12 to 0.15. The catalysts were characterized by TPR and EPR, and the results show that activated carbon decorated with potassium makes co-mo species highly dispersed, and thus easily reduced and sulfurized. XRD results show that an appropriate content of potassium-decoration on active carbon supports may favors the formation of highly dispersed co 9 S 8 -type structures which are situated on the edge or a site in contact with moS 2 , K-mo-O-S, mo-S-K phase. Those active species are responsible for the high activity of como-K/AC catalysts.

关键词： active carbon potassium-decorated active phase co-mo-based catalyst water-gas shift

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Water gas shift activity of co-mo/MgO-Al_2O_3 catalysts presulfided with ammonium sulfide

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Journal of Natural Gas Chemistry 2010年第1期19卷 61-66页

作者： Yixin Lian, Huifang Wang, Weiping Fang, Yiquan Yang Department of Chemistry, college of Chemistry and Chemical Engineering, National Engineering Laboratory for Green Chemical Productions of Alcohols, Ethers and Esters, Xiamen University, Xiamen 361005, Fujian, China Department of Chemistry College of Chemistry and Chemical Engineering National Engineering Laboratory for Green Chemical Productions of Alcohols Ethers and Esters Xiamen University Xiamen 361005 Fujian China

co-mo/MgO-Al2O3 catalyst was presulfided with ammonium sulfide in aqueous solution and activated with synthesis gas for water gas shift reaction. The assay results indicate that the presulfided co-mo/MgO-Al2O3 catalyst exhibits an excellent catalytic activity and stability. XRD and EPR characterization results show that the O-S exchange might occur during the impregnation, leading to the formation of （NH4）2moS4 （or （NH4）zmoxSy） precursor, which was then thermally decomposed and reduced to moS2. The higher catalytic performance is attributed to an optimization formation of active co-mo sulfides, consisting of well dispersed moS2 and co-mo-S phase due to the redispersion of co sulfide particles over the edges of newly formed moS2 crystallites.

关键词： co-mo-based catalyst ammonium sulfide presulfidation water-gas shift

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