摘要
为提高光热催化CO2加氢In2O3催化剂的催化活性,采用均相水热法制备Mg(OH)2-In(OH)3前驱体,通过高温煅烧和H2-还原处理得到了富含氧空位的Mg掺杂In2O3-x(Mg-In2O3-x)催化剂.在300℃、常压、可见光照射条件下,CO2加氢转化为CO的CO2转化率可达31.20％,CO产生速率为14.22 mmol·gcat-1·h-1,CO选择性为100％.相比于单一In2O3-x催化剂,Mg-In2O3-x催化剂光热催化CO2转化率及CO产生速率明显提高,这归因于Mg成功掺杂到In2O3晶格中,促进In2O3表面氧空位的形成,进而对可见光响应效率大幅提高,并有效减缓光生电子-空穴的复合.
Abstract
To improve the catalytic activity of the photothermal CO2 hydrogenation In2O3 catalyst,a Mg(OH)2-In(OH)3 precursor was prepared by the homogeneous hydrothermal method,and a Mg-doped In2O3-x(Mg-In2O3-x)catalyst enriched with oxygen vacancies was obtained by the following high-temperature calcination and H2-reducing treat-ment.The catalyst was evaluated for its photothermal catalytic performance of CO2 hydrogenation in a photothermal fixed-bed reactor.The results demonstrated that Mg-In2O3-x achieved an impressive CO2 conversion rate of 31.20％with a CO production rate of 14.22 mmol·gcat-1·h-1 and selectivity of 100％in the light reaction at 300 ℃.The char-acterization results confirmed that the Mg doping into the In2O3 lattice promotes the formation of more surface oxy-gen vacancies,which dramatically increases the response efficiency to visible light and slows down the recombina-tion of photogenerated electron-hole.This is the main reason for the enhancement of the photothermal catalytic per-formance.
基金项目
国家自然科学基金(51674194)
陕西省自然科学基础研究计划一般项目-青年项目(2022JQ-111)
NETL
NSTL
万方数据