Harnessing the Beneficial Attributes of Ceria and Titania in a Mixed-Oxide Support for Nickel-Catalyzed Photothermal CO_2 Methanation

作     者：Ee Teng Kho Salina Jantarang Zhaoke Zheng Jason Scott Rose Amal 

作者机构：Particles and Catalysis Research Laboratory School of Chemical Sciences and Engineering The University of New South Wales Sydney NSW 2052 Australia 

出 版 物：《Engineering》 (工程（英文）)

年 卷 期：2017年第3卷第3期

页      面：393-401页

核心收录：

学科分类：07[理学] 08[工学] 

基　　金：financially supported by the Australian Research Council under the Laureate Fellowship Scheme (FL140100081) 

主　　题：Photothermal CO_2 reduction Nickel Ceria Titania 

摘      要：Solar-powered carbon dioxide （CO_2）-to-fuel conversion presents itself as an ideal solution for both CO_2 mit- igation and the rapidly growing world energy demand. In this work, the heating effect of light irradiation onto a bed of supported nickel （Ni） catalyst was utilized to facilitate CO_2 conversion. Ceria （CeO_2）-titania （TiO_2） oxide supports of different compositions were employed and their effects on photothermal CO_2 conver- sion examined, Two factors are shown to be crucial for instigating photothermal CO_2 methanation activity： ① Fine nickel deposits are required for both higher active catalyst area and greater light absorption capacity for the initial heating of the catalyst bed; and ② the presence of defect sites on the support are necessary to promote adsorption of C02 for its subsequent activation, Titania inclusion within the support plays a crucial role in maintaining the oxygen vacancy defect sites on the （titanium-doped） cerium oxide. The combination of elevated light absorption and stabilized reduced states for CO_2 adsorption subsequently invokes effective Dhotothermal CO_2 methanation when the ceria and titania are blended in the ideal ratio（s）.