Surface Properties of Rh/AlPO4 Catalyst Providing High Resistance to Sulfur and Phosphorus Poisoning

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• 作者：Haris Puspito Buwono ; Saki Minami ; Kosuke Uemura ; Masato Machida
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2015
• 出版时间：July 29, 2015
• 年：2015
• 卷：54
• 期：29
• 页码：7233-7240
• 全文大小：376K
• ISSN：1520-5045

文摘

A rhodium catalyst supported on AlPO₄ exhibited a much higher resistance to sulfur and phosphorus poisoning compared with a reference catalyst (Rh/Al₂O₃). The acidic surface of AlPO₄ was effective in preventing the adsorption of sulfur oxides (SO₂), whereas Lewis acid/base sites on Al₂O₃ favored SO₂ adsorption followed by the formation of sulfite, leading to deterioration of the activity of Rh/Al₂O₃ for the model NO鈥揅O鈥揅₃H₆鈥揙₂ reaction. Similarly, the AlPO₄ support suppressed the extent of phosphorus poisoning caused by dimethylphosphite (DMP) (CH₃O)₂POH, which was used as a model phosphorus source. A greater amount of inactive phosphate overlayers were deposited from the gas feed containing DMP and O₂ on Rh/Al₂O₃ than Rh/AlPO₄ because of the reaction between P₂O₅ vapors and Al₂O₃. Consequently, the active Rh surface was covered to a greater extent for Rh/Al₂O₃ than Rh/AlPO₄.