Behavior of catalysts with rhodium in simultaneous hydrodesulfurization and hydrogenation reactions

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• 作者：Sonia A. Giraldo ; Marí ; a H. Pinzó ; n ; Aristó ; bulo Centeno
• 关键词：Rh/γ ; -Al₂O₃ ; Activating mixtures ; RhMo/γ ; -Al₂O₃ ; Hydrodesulfurization ; Hydrogenation
• 刊名：Catalysis Today
• 出版年：2008
• 期刊代码：13_09205861
• 类别：ce
• 出版时间：April-June 2008
• 卷：133-135
• 期：Complete
• 页码：239-243
• 文件大小：158 K

摘要

The behavior of catalysts containing rhodium was evaluated in hydrotreating (HDT) reactions at 583 K and 5 MPa. The influence of the temperature and the nature of the activating agent were analyzed for the monometallic Rh/γ-Al₂O₃ catalyst in simultaneous hydrodesulfurization (HDS) of dibenzothiophene (DBT) and hydrogenation (HYD) of naphthalene (NT). H₂, H₂S, N₂ and H₂S (15 vol.%)/H₂, H₂S (85 vol.%)/H₂ mixtures were used as activating agents. Bimetallic RhMo/γ-Al₂O₃ catalysts with different Rh/Mo ratios were also tested in the same reactions. Some of the catalysts were characterized by XPS. The results show that for the Rh monometallic catalyst, the H₂S present in the activating mixture leads to an increase in the selectivity to HDS. Synergy in both HDS and HYD reactions was detected for the bimetallic catalysts, and it presents a slight increase with the Rh/(Rh + Mo) atomic ratio. These results lead to speculate about the possible role of Rh in bimetallic catalysts.