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A series of Au-supported cerium oxide binary composite oxides doped with different metals (M = Mn, Cu, Ni, and Co) were synthesized and applied to the oxidative esterification of methylacrolein (MAL) with methanol (MeOH) to methyl methacrylate. The structural properties and states of the supports and catalysts were characterized by X-ray diffraction, Brunauer−Emmett−Teller, X-ray photoelectron spectroscopy, and inductively coupled plasma−Mass and transmission electron microscopy. The reducibility and basicity of Au/MnCeO x solid solution were tested by H 2 -TPR and CO 2 -TPD. The effects of various operating parameters such as reaction temperature, reaction pressure, and reaction time were investigated. The highest activity with the conversion 99.9% and selectivity 90.6% for MAL can be observed using Au/MnCeO x as the catalyst because of its high reducibility and more amount of basic sites. The kinetics of gas−liquid−solid heterogeneously catalyzed oxidative esterification of MAL, O 2 , and MeOH was studied. The possible reaction mechanism was also proposed.

Esterification is one of the most pivotal organic transformations. Au catalysts were prepared by using a colloid deposition method with poly(vinyl alcohol) (PVA) as a protective agent. The catalyst was used for the oxidative esterification of methacrylate (MAL) to methyl methacrylate (MMA). Three pre‐treatments were used to remove the PVA, which is unfavorable for catalytic activity. It is found that the catalyst pre‐treated at 300 °C showed substantially improved activity owing to the lower PVA loading compared with catalysts treated with hot water washing and water reflux. Surprisingly, it is also found that the distribution and loading content of Au particles was closely related to the pH of the colloid solution. We demonstrate that the deposition process is controlled by the different charge of the support surface at different colloid solution pH. Further, the catalysts with similar size Au particles loaded on TiO2, SiO2, Al2O3, CeO2, ZrO2, and ZnO were successfully prepared by controlling the colloid solution pH. The Au/ZnO catalyst presented the best performance, which may be a result of the strong basic surface sites that improved the formation of the intermediate and the strong interaction between Au and ZnO. This interaction caused an anchoring effect and changed the geometries of Au particles, which could enhance the stability of catalysts and promote the mobility of oxygen, respectively.

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