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Direct oxidative esterification of aldehyde with alcohol to ester over Pd / styrene - divinyl benzene copolymer catalyst / Baohe Wang in Industrial & engineering chemistry research, Vol. 51 N° 10 (Mars 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 10 (Mars 2012) . - pp. 3932–3938 Titre : Direct oxidative esterification of aldehyde with alcohol to ester over Pd / styrene - divinyl benzene copolymer catalyst Type de document : texte imprimé Auteurs : Baohe Wang, Auteur ; Weili Ran, Auteur ; Wenjuan Sun, Auteur Année de publication : 2012 Article en page(s) : pp. 3932–3938 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Oxidative  esterification  Catalyst Résumé : The direct oxidative esterification of methacrolein (MAL) with methanol in the presence of molecular O2 at low temperature and ambient pressure to methyl methacrylate (MMA) was carried out over a novel hydrophobic styrene-divinyl benzene copolymer (SDB) supported palladium catalyst, and the results were compared with conventional hydrophilic catalysts over SiO2 and γ-Al2O3. Among the catalysts studied, SDB supported palladium catalyst showed higher activity than the conventional catalysts. The Pd/SDB catalyst was characterized by X-ray powder diffraction (XRD), environmental scanning electron microscope (ESEM), and thermal gravimetric analysis (TGA). A systematic investigation was carried out for the oxidative esterification of MAL with methanol over SDB supported catalyst. The effects of catalyst loading and alcohol/aldehyde molar ratio were studied. The reaction kinetics was studied, and the result showed that the fitting results agreed well with the experimental data. On the basis of the Langmuir–Hinshelwood adsorption model, the probable mechanism was suggested. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202701k [article] Direct oxidative esterification of aldehyde with alcohol to ester over Pd / styrene - divinyl benzene copolymer catalyst [texte imprimé] / Baohe Wang, Auteur ; Weili Ran, Auteur ; Wenjuan Sun, Auteur . - 2012 . - pp. 3932–3938. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 10 (Mars 2012) . - pp. 3932–3938 Mots-clés : Oxidative  esterification  Catalyst Résumé : The direct oxidative esterification of methacrolein (MAL) with methanol in the presence of molecular O2 at low temperature and ambient pressure to methyl methacrylate (MMA) was carried out over a novel hydrophobic styrene-divinyl benzene copolymer (SDB) supported palladium catalyst, and the results were compared with conventional hydrophilic catalysts over SiO2 and γ-Al2O3. Among the catalysts studied, SDB supported palladium catalyst showed higher activity than the conventional catalysts. The Pd/SDB catalyst was characterized by X-ray powder diffraction (XRD), environmental scanning electron microscope (ESEM), and thermal gravimetric analysis (TGA). A systematic investigation was carried out for the oxidative esterification of MAL with methanol over SDB supported catalyst. The effects of catalyst loading and alcohol/aldehyde molar ratio were studied. The reaction kinetics was studied, and the result showed that the fitting results agreed well with the experimental data. On the basis of the Langmuir–Hinshelwood adsorption model, the probable mechanism was suggested. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202701k

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