Pd鈥揚b/SDB Bimetallic Catalysts for The Direct Oxidative Esterification of Methacrolein to Methyl Methacrylate

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• 作者：Baohe Wang ; Wenjuan Sun ; Jing Zhu ; Weili Ran ; Shuang Chen
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2012
• 出版时间：November 21, 2012
• 年：2012
• 卷：51
• 期：46
• 页码：15004-15010
• 全文大小：367K
• 年卷期：v.51,no.46(November 21, 2012)
• ISSN：1520-5045

文摘

Pd鈥揚b/SDB catalyst prepared by depositing lead and palladium on hydrophobic styrene-divinylbenzene (SDB) copolymer constitutes a new and highly efficient catalyst for the oxidative esterification of methacrolein with methanol to methyl methacrylate under mild conditions. Compared to the monometallic Pd/SDB catalyst and conventional hydrophilic catalysts supported on 纬-Al₂O₃, the Pd鈥揚b/SDB bimetallic catalyst shows higher reaction rate and product selectivity. The Pd鈥揚b/SDB catalyst was prepared by impregnating method and characterized by N₂ adsorption鈥揹esorption isotherm, X-ray diffraction (XRD), environmental scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The results showed that Pd鈥揚b atoms formed intermetallic Pd₃Pb₁ crystals and the active component had a better dispersion and a smaller particle size than Pd/SDB. The SDB-supported catalyst could be recycled easily and reused, even up to seven cycles, without any appreciable loss efficiency. Based on the experimental results, the potential reaction mechanism was also proposed.