分级多孔过渡金属钛酸盐基光还原CO2催化剂的设计合成及表面改性

项目名称： 分级多孔过渡金属钛酸盐基光还原CO2催化剂的设计合成及表面改性

项目编号： No.21501052

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 数理科学和化学

项目作者： 曲阳

作者单位： 黑龙江大学

项目金额： 25万元

中文摘要： 针对钛酸盐光还原CO2催化剂活性相对较差，能带结构不合理等科学问题，本项目拟提出通过结构设计和能带调控策略制备多孔分级结构过渡金属钛酸盐基光还原CO2催化剂及其表面碱改性的构想。拟采用软硬模板法、冻干法等实现分级多孔结构控制合成，选择Mg、Ca、Sr等碱土金属调控过渡金属钛酸盐的能带结构，以提高材料导带位置，制备分级多孔过渡金属钛酸盐基光还原CO2催化剂。利用湿化学等方法对分级多孔过渡金属钛酸盐基光还原CO2催化剂进行表面碱化改性，提高CO2等反应物的表面吸附能力，提升材料的光催化性能。结合时间分辨光谱技术和热重-红外技术等，深入探究材料组成、表界面化学对材料光催化性能的影响。开发新型、稳定、高活性的钛酸盐基光还原CO2催化剂，为钙钛矿型光催化剂的研究提供实验和理论依据，丰富光催化还原CO2的催化剂材料体系。

中文关键词： 多孔材料；复合钛酸盐；能带调控；表面改性；光催化还原CO2

英文摘要： In view of scientific problems of the poor activity and unreasonable energy band structure of titanates for photocatalytic CO2 reduction, this project proposed structure design, band-gap turning strategies to prepare hierarchical porous transition-metal-titanates(TMT) based photoreduction CO2 catalyst and their surface alkalization modification. Methods such as soft-hard template and freeze dry were intended use to control the hierarchical porous structures, Mg, Ca, Sr and other alkaline earth metal were selected to turn the energy band structure of TMT, in order to improve the position of the conduction band and to prepare hierarchical porous TMT base photoreduction CO2 catalyst. Wet chemical or other effective methods were used to enhance the surface alkalization of TMT based photocatalsts and improve the surface adsorption capacity of CO2 and other reactants, to enhance their photocatalytic properties. Combining the time-resolved spectroscopy and thermogravimetry-infrared technology, the influence of material composition, surface/ interface chemistries on the photocatalytic properties are in-depth studied. We aim to develop new, stable and high activity titanates base photocatalysts for reduction CO2 and provide experimental and theoretical basis for the research of perovskite based photocatalyst, to further enrich photocatalytic CO2reduction catalysts system.

英文关键词： porous material;titanates composites oxides ;band gap turning;surface modification;photocatalytic CO2 reduction