Characterization of active sites in sulfided molybdenum/alumina hydrodesulfurization catalysts.

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概要

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• The site configuration of Al<SUB>2</SUB>O<SUB>3</SUB>-supported molybdenum sulfides catalytically active for hydrodesulfurization (HDS) of thiophene has been investigated as a function of pretreatment conditions (H<SUB>2</SUB>S/H<SUB>2</SUB>=0–0.2) by using X-ray photoelectron, laser Raman and IR spectroscopies and temperature-programmed desorption of adsorbed NO. It has been found that when MoO<SUB>3</SUB>/Al<SUB>2</SUB>O<SUB>3</SUB> catalysts are presulfided with H<SUB>2</SUB>S/H<SUB>2</SUB>, MoS<SUB>2</SUB>-like species are formed, whereas when prereduced and subsequently sulfided during the HDS reaction, molybdenum oxide sulfides or highly dispersed amorphous molybdenum sulfides are initially produced. The turnover frequency of the HDS reaction calculated on the basis of the NO adsorption was shown to increase with decreasing dispersion degree of sulfided molyb denum. It is proposed that two kinds of NO adsorption sites are present; triply and doubly coordinatively unsaturated (cus) molybdenum sites. It is considered that both sites are catalytically active, possibly, the triply cus species being more active. It is concluded that the HDS activity of sulfided MoO<SUB>3</SUB>/Al<SUB>2</SUB>O<SUB>3</SUB> catalysts is determined by the structure, dispersion and coordinative unsaturation of sulfided molybdenum.

• 公益社団法人 日本化学会の論文

著者

• Imanaka Toshinobu

  Department Of Chemical Engineering Faculty Of Engineering Science Osaka University

• Okamoto Yasuaki

  Department Of Applied Chemistry Tokyo University Of Science Yamaguchi

• Kitamura Masaru

  Department of Chemical Engineering, Faculty of Engineering Science, Osaka University

• Maezawa Akinori

  Department of Chemical Engineering, Faculty of Engineering Science, Osaka University

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