“…47,49,50 Therefore, XPS diagrams of the collected catalyst and the HfO 2 -(c) were analyzed to explore the changes in the intensity of the acid-base sites in the catalyst. 48 In the MPV reduction reaction process, the Lewis acid site is mainly used to complete the transfer hydrogenation process, and the Lewis base site mainly plays the role in activating the hydroxyl group. Therefore, it was demonstrated that HfO 2 -(c) can effectively catalyze the production of FA from FF.…”