HDS of 4,6-DMDBT over NiMoP/(x)Ti-SBA-15 catalysts prepared with H3PMo12O40

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• 作者：Jorge Ram铆rez ; A铆da Guti茅rrez-Alejandre ; Felipe S谩nchez-Minero ; V铆ctor Mac铆as-Alc谩ntara ; Perla Castillo-Villal贸n ; Laetitia Oliviero ; Fran莽oise Maug茅
• 刊名：Energy & Fuels
• 出版年：2012
• 出版时间：February 16, 2012
• 年：2012
• 卷：26
• 期：2
• 页码：773-782
• 全文大小：417K
• 年卷期：v.26,no.2(February 16, 2012)
• ISSN：1520-5029

文摘

HDS of 4,6-DMDBT over NiMoP/SBA-15 and NiMoP/(x)TiSBA-15 catalysts prepared using an heteropolyacid (H₃PMo₁₂O₄₀) and nickel citrate (C₁₂H₁₀Ni₃O₁₄) as Mo and Ni precursors was studied. To analyze the effect of calcination temperature on HDS activity, catalysts noncalcined and calcined at 773 K were prepared. The performance of the different catalysts during the hydrodesulfurization of 4,6-dimethyldibenzothiophene was compared with that of a reference catalyst prepared by impregnation with a solution containing ammonium heptamolybdate and nickel nitrate. Kinetic parameters for the HDS of 4,6-DMDBT were estimated using a simplified kinetic model. The catalysts were characterized by N₂ physisorption, X-ray diffraction, Raman, and IR of adsorbed CO at 100 K. The results show that for catalysts supported on pure SBA-15 the noncalcined catalyst prepared with H₃PMo₁₂O₄₀ (NiMoP(H-nc)/SBA-15) presents the highest number of active sites, the higher apparent reaction rate constant for the hydrogenation route, and therefore the best 4,6-DMDBT HDS activity. In contrast, for Ti-modified catalysts, NiMoP/(x)Ti-SBA-15, the highest HDS activity was found when 15% of TiO₂ was incorporated to SBA-15 and the catalyst was calcined at 773 K. This catalyst presented the highest TOF.