Elucidation of sulfidation state and hydrodesulfurization mechanism on ruthenium–cesium sulfide catalysts using ³⁵S radioisotope tracer methods

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• 作者：Ishihara ; Atsushi ; Lee ; Jeayoung ; Dumeignil ; Franck ; Higashi ; Ryuichirou ; Wang ; Anjie ; Qian ; Eika W. ; et. al.
• 关键词：Hydrodesulfurization ; Dibenzothiophene ; ³⁵S ; Radioisotope ; Tracer ; Ruthenium ; Cesium ; Sulfide ; Alumina
• 刊名：Journal of Catalysis
• 出版年：2003
• 出版时间：July 1, 2003
• 年：2003
• 卷：217
• 期：1
• 页码：59-68
• 全文大小：560 K

文摘

Alumina-supported ruthenium–cesium catalysts were presulfided using [³⁵S]H₂S pulse tracer method to evaluate their sulfidation state. Subsequently, using these previously ³⁵S-labeled catalysts, HDS reactions of dibenzothiophene (DBT) were performed and the mobility of ³⁵S introduced during the presulfidation stage was investigated. The results showed that the amount of labile sulfur (S₀) was much smaller than the total amount of sulfur accommodated on the catalyst (S_total). DBT conversion and S_total increased linearly with Ru content. In a second part, labile sulfur amount was also determined under the catalyst working conditions and different results were obtained. Indeed, when the catalysts were marked with [³⁵S] and with [³⁵S]DBT under HDS reaction conditions, the obtained labile sulfur quantities (S_0A) were significantly higher than the ones measured during the presulfidation stage (S₀). These results showed that the labile sulfur is not formed on RuCs catalysts until the HDS reaction proceeds, which is quite different from that reported before for Mo, Pt, or Pd systems.