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10. Oxygen vacancies generated by Sn-doped ZrO 2 promoting the synthesis of dimethyl carbonate from methanol and CO 2 .

Author

Song S, Wei J, He X, Yan G, Jiao M, Zeng W, Dai F, and Shi M

Abstract

Oxygen vacancy sites on a catalyst surface have been extensively studied and been proved to promote the adsorption and activation of carbon dioxide. We use Sn-doped ZrO 2 to prepare a Zr/Sn catalyst rich in oxygen vacancies (OVs) by co-precipitation. The yield of dimethyl carbonate is 5 times that of ZrO 2 . Compared with the original ZrO 2 , Zr/Sn exhibits a higher specific surface area, number of acid-base sites and a lower band gap, which improves the conductivity of electrons and creates more surface. The number of reaction sites greatly enhances the adsorption and activation capacity of CO 2 molecules on the catalyst surface. In situ infrared spectroscopy shows that CO 2 adsorbs on oxygen vacancies to form monomethyl carbonate, and participates in the reaction as an intermediate species. This work provides new clues for the preparation of ZrO 2 -based catalysts rich in oxygen vacancies to directly catalyze the synthesis of dimethyl carbonate from methanol and CO 2 ., Competing Interests: The authors declare no competing financial interest., (This journal is © The Royal Society of Chemistry.)

Published
2021
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