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Author: search.filters.author.Ieamviteevanich, PimchanokSubject: search.filters.subject.Catalyst

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    Item type:Publication,
    Modification of acid–base properties of metal-doped ZnO catalysts for the transesterification of propylene carbonate with methanol to dimethyl carbonate
    (2025-04-01)
    Ieamviteevanich, Pimchanok
    ;
    Kim-Lohsoontorn, Pattaraporn
    ;
    Seeharaj, Panpailin
    This study investigated the effect of metal dopants on the surface properties of ZnO-based catalysts for the transesterification of propylene carbonate (PC) with methanol to produce dimethyl carbonate (DMC). A series of metal-doped ZnO nanocatalysts (M-ZnO, where M is Ca<sup>2+</sup>, Cu<sup>2+</sup>, Ce<sup>3+</sup>, La<sup>3+</sup>, and Y<sup>3+</sup> with the mol ratio of Zn<sup>2+</sup>/M<sup>x+</sup> = 4) were prepared by a simple co-precipitation method followed by calcining in air at 673 K for 5 h. Introducing different metal cations into the ZnO system decreased crystallite size and created surface defects of exposed cations and oxygen vacancies, increasing surface-active acid and basic sites. The catalytic performance for DMC production was ranked as follows: Ca-ZnO < Cu–ZnO < ZnO < Ce-ZnO < Y-ZnO < La-ZnO. La-ZnO showed the highest performance of all catalysts, with 67% PC conversion, 67% DMC selectivity, and 45% DMC yield. The improvement of catalytic activity was correlated with an increase in the concentration of moderate and strong acid–base functionalities on the La-ZnO surfaces for participating in the reaction of PC and methanol to form DMC.
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