The Performance of C2 Oxygenates Synthesis from Syngas over Rh-Mn-Li-Fe/SiO2 Catalysts with Various Rh Loadings

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• 作者：Hongmei Yin ; Yunjie Ding ; Hongyuan Luo ; Li Yan ; Tao Wang ; and Liwu Lin
• 刊名：Energy & Fuels
• 出版年：2003
• 出版时间：November 2003
• 年：2003
• 卷：17
• 期：6
• 页码：1401 - 1406
• 全文大小：130K
• 年卷期：v.17,no.6(November 2003)
• ISSN：1520-5029

文摘

The promotion effect of additives on Rh-Mn-Li-Fe/SiO₂ catalyst was investigated by meansof an in-situ FTIR technique. IR results suggested that the additives Fe, Mn, and Li might be inclose contact with Rh, and form new active sites, which promoted CO activation over Rh surfaceand favored the formation of C₂-oxygenated intermediates. The catalysts with rhodium loadingof 1.0-5.0 wt % were tested by CO hydrogenation to find the optimized rhodium loading. Theresults showed that the high-rhodium-loading catalysts exhibited high activity and selectivitytoward C₂ oxygenates at low temperature, but the selectivity was very sensitive to reactiontemperature, low-rhodium-loading catalysts showed low activity, while the selectivity was notso sensitive to reaction temperature, therefore high space time yield (STY) of C₂ oxygenates canbe obtained by increasing the reaction temperature. Among the catalysts investigated, the 1.5wt % rhodium catalyst exhibited the highest selectivity and relative higher rhodium efficiencyfor the synthesis of C₂ oxygenates.