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Pd–Pb/SDB bimetallic catalysts for the direct oxidative esterification of methacrolein to methyl methacrylate / Baohe Wang in Industrial & engineering chemistry research, Vol. 51 N° 46 (Novembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 46 (Novembre 2012) . - pp. 15004-15010 Titre : Pd–Pb/SDB bimetallic catalysts for the direct oxidative esterification of methacrolein to methyl methacrylate Type de document : texte imprimé Auteurs : Baohe Wang, Auteur ; Wenjuan Sun, Auteur ; Jing Zhu, Auteur Année de publication : 2013 Article en page(s) : pp. 15004-15010 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Esterification  Oxidation  Catalyst Résumé : Pd―Pb/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 γ-Al2O3, the Pd―Pb/SDB bimetallic catalyst shows higher reaction rate and product selectivity. The Pd―Pb/SDB catalyst was prepared by impregnating method and characterized by N2 adsorption-desorption isotherm, X-ray diffraction (XRD), environmental scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The results showed that Pd―Pb 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. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679619 [article] Pd–Pb/SDB bimetallic catalysts for the direct oxidative esterification of methacrolein to methyl methacrylate [texte imprimé] / Baohe Wang, Auteur ; Wenjuan Sun, Auteur ; Jing Zhu, Auteur . - 2013 . - pp. 15004-15010. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 46 (Novembre 2012) . - pp. 15004-15010 Mots-clés : Esterification  Oxidation  Catalyst Résumé : Pd―Pb/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 γ-Al2O3, the Pd―Pb/SDB bimetallic catalyst shows higher reaction rate and product selectivity. The Pd―Pb/SDB catalyst was prepared by impregnating method and characterized by N2 adsorption-desorption isotherm, X-ray diffraction (XRD), environmental scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The results showed that Pd―Pb 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. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679619