Fe-Promoted Ni/Al2O3 Thioetherification Catalysts with Enhanced Low-Temperature Activity for Removing Mercaptans from Liquefied Petroleum Gas

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• 作者：Deqi Huang ; Ming Ke ; Xiaojun Bao ; Haiyan Liu
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2016
• 出版时间：February 10, 2016
• 年：2016
• 卷：55
• 期：5
• 页码：1192-1201
• 全文大小：517K
• ISSN：1520-5045

文摘

To enhance the low-temperature activity of monometallic Ni/Al₂O₃ catalyst for thioetherification, Fe-promoted Ni/Al₂O₃ catalysts were prepared. The activity of the catalysts was evaluated in a fixed-bed reactor, and their physicochemical properties were characterized. The results showed that the bimetallic NiFe system had significantly improved activity; in particular sample 14Ni8Fe/Al₂O₃ exhibited outstanding activity and stability, with conversions of CH₃SH and C₂H₅SH reaching up to 99.5% and 97.4%, respectively, at 75 °C. The promoting effects of Fe include two aspects: (i) Partial incorporated Fe species act as textural promoters, preventing the formation of NiAl₂O₄, increasing the amount of nickel oxides (NiO and NiFe₂O₄) weakly interacting with Al₂O₃, and thereby generating more active sulfides [NiS_x and NiS(FeS)] after sulfidation, and (ii) Fe species in a NiS(FeS) phase serving as electron donors supply electron density to the intimately contacted NiS species and weaken the Ni–S bonds, promoting the formation of a NiS(FeS) phase with superior activity.