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• W2055120239 abstract "Abstract Ni–W hydrodesulfurization (HDS) catalysts supported on MCM-41 synthesized from two different silica sources (sodium silicate hydrate and tetraethylorthosilicate) as well as on Na + or K + ion exchanged MCM-41 were prepared. These catalysts were used to investigate the influence of the surface properties of MCM-41 on the performance of HDS catalysts with DBT as the model molecule. The XRD and N 2 adsorption results indicated that the MCM-41 prepared from tetraethylorthosilicate (MCM-41(T)) exhibited the best structural properties. The mesostructure of MCM-41 synthesized from sodium silicate (MCM-41(S)) remained after ion exchange with Na 2 C 2 O 2 and K 2 C 2 O 2 . Both pyridine FT-IR and Hammett indicators showed that only MCM-41(S) possessed some Bronsted and Lewis acid sites. Ni–W/MCM-41(S) showed the highest HDS and hydrogenation activities. The introduction of Na + and K + strongly inhibited the hydrogenation activity of Ni–W/MCM-41(S) but enhanced its hydrogenolysis activity. UV–vis and TPR studies indicated that the introduction of Na + and K + into MCM-41(S) may lead to the segregation of surface Ni species and may hinder the reducibility of the supported Ni–W oxides. Spillover hydrogen, which is “trapped” by Na + and K + , may play an important role in the HDS activity and selectivity of Ni–W catalysts." @default.
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• W2055120239 date "2007-01-01" @default.
• W2055120239 modified "2023-10-05" @default.
• W2055120239 title "Effect of surface Na+ or K+ ion exchange on hydrodesulfurization performance of MCM-41-supported Ni–W catalysts" @default.
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• W2055120239 doi "https://doi.org/10.1016/j.apcata.2006.08.027" @default.
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