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Support effects on the chemical property and catalytic activity of co-mo HDS catalyst in sulfur recovery

Journal of Natural Gas Chemistry 2010年第1期19卷 91-95页

作者： Ali Nakhaei Pour Ali morad Rashidi Kherolah Jafari Jozani Ali mohajeri Payman Khorami Research Institute of Petroleum Industry of National Iranian Oil company P. O. Box 114665-137 Tehran Iran

Effects of carbon nanotubes （CNT） and alumina （γ-Al2O3） supports on the catalytic activities of hydrodesulfurization （HDS） process over co- mo catalyst have been studied. XRD results indicated that the main active phases in CNT and γ-Al2O3 supported co-mo catalysts are moO2 and moO3, respectively. The TPR results reveal that the reduction peak temperatures of the active species on CNT supported co-mo catalyst is lower than those on alumina supported co-mo catalyst, indicating that the CNT supports favor the reduction of active species. Catalytic evaluation results displayed that the sulfur content in the reaction products on the CNT supported co-mo catalyst is lower than that on the alumina supported co-mo catalyst if the HDS reaction was carried out at a temperature above 583 K.

关键词： sulfur recovery co-mo catalyst carbon nanotubes HDS process

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Effect of Mg/Al atom ratio of support on catalytic performance of co-mo/MgO-Al_2O_3 catalyst for water gas shift reaction

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Journal of Natural Gas Chemistry 2009年第2期18卷 161-166页

作者： Yixin Lian Huifang Wang Quanxing Zheng 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

co-mo-based catalysts supported on mixed oxide supports MgO-Al2O3 with different Mg/Al atom ratios for water gas shift reaction were studied by means of TPR, Raman, XPS and ESR. It was found that the octahedral mo species in oxidized co-mo/MgO（x）-Al2O3 catalyst and the contents of mo^5＋, mo^4＋, S^2- and S^2-2 species in the functioning catalysts increased with increasing the Mg/Al atom ratio of the support under the studied experimental conditions. This is favorable for the formation of the active co-mo-S phase of the catalysts. Catalytic performance testing results showed that the catalysts co-mo/MgO-Al2O3 with the Mg/Al atom ratio of the support in the range of 0.475-0.525 exhibited optimal catalytic activity for the reaction.

关键词： co-mo catalyst reduction sulfidation mixed support water gas shift

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XPS Characterization of Carbon Nanotube Supported como Hydrodesulfurization catalysts

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Chinese Journal of Chemistry 2004年第11期22卷 1250-1256页

作者：商红岩刘晨光赵瑞玉吴明铂魏飞 Key Laboratory of Catalysis Chinese National Petroleum Corporation (CNPC) University of Petroleum Dongying Shandong 257061 China State Key Laboratory of Heavy Oil Processing University of Petroleum Dongying Shandong 257061 China Department of Chemical Engineering Tsinghua University Beijing 100084 China

In this paper, the effect of catalytic support and sulfiding method on the chemical state of supported co-mo catalysts is studied by XPS. After sulfidation with in-situ method, the majority of molybdenum in CNT supported como catalyst is transferred to a species with a formal chemical state mo(IV) in moS2 phase, and the rest to mo(V) which consists of mo coordinated both to O and S, such as moO2S2-2 and moO3S2-. In case of como/-Al2O3 catalyst sulfided with in-situ method, a fraction of molybdenum is transferred to formal state mo(IV) in the form of moS2, but there is still a mount of unreduced mo(VI) phase which is difficult to be sulfided. In como/CNT cata-lytic system sulfided with ex-situ method, mo(IV) in the form of moS2 is detected along with a portion of unre-duced mo(VI) phase, suggesting that not all the mo phases are reduced and sulfided by ex-situ method. As for como/-Al2O3, a portion of molybdenum is sulfided to intermediate reduced state mo(V) which consists of mo co-ordinated both to O and S, such as moO2S2-2 and moO3S2-, in addition, there is still a fraction of unreduced mo(VI) phase. XPS analyses results suggest that CNT support facilitates the reduction and sulfidation of active species to a large extent, and that alumina support strongly interacts with active species, hereby producing a fraction of phase which resists complete sulfiding. Catalytic measurements of catalysts in the HDS of dibenzothiophene (DBT) show that como/CNT catalysts are of higher HDS activity and selectivity than como/-Al2O3 catalyst, which is in good relation with the sulfiding behavior of the corresponding catalyst.

关键词： carbon nanotube XPS HDS molybdenum co-mo catalyst

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