Preparation of Ce-MOFs derivatives CeO2 catalysts and performance in the synthesis of dimethyl carbonate from CO2 and methanol

Ce-MOF-808, Ce-UiO-66 and Ce-BTC were synthesized by hydrothermal method. Then derivatives CeO2 corresponding to Ce-MOFs was prepared by pyrolysis at different temperatures. Finnally CeO2 was used as catalyst for synthesis of dimethyl carbonate (DMC) from CO2 and methanol. The samples were characterized by XRD, N2 isothermal adsorption and desorption, SEM, NH3-temperature programmed desorption (TPD), CO2-TPD and XPS. All the Ce-MOFs derivatives CeO2 catalysts which pyrolysis at 450℃ exhibited the highest relative oxygen vacancy concentration as well as catalytic activity. Among them, CeO2-BTC-450 showed the best catalytic activity with a DMC space-time yield of 1.77 mmol·g−1·h−1. In this study, a strategy to prepare CeO2-based catalysts with high oxygen vacancy concentration by using Ce-MOFs as precursor was proposed.