| Titre : | Pd–Pb/SDB bimetallic catalysts for the direct oxidative esterification of methacrolein to methyl methacrylate (2013) |
| Auteurs : | Baohe Wang, Auteur ; Wenjuan Sun, Auteur ; Jing Zhu, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | Industrial & engineering chemistry research (Vol. 51 N° 46, Novembre 2012) |
| Article en page(s) : | pp. 15004-15010 |
| Note générale : | Industrial chemistry |
| Langues : | Anglais |
| Tags : | 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 |
