摘要
为提高光热催化CO_(2)加氢In_(2)O_(3)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In_(2)O_(3)-x(Mg-In_(2)O_(3)-x)催化剂。在300℃、常压、可见光照射条件下,CO_(2)加氢转化为CO的CO_(2)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In_(2)O_(3)-x催化剂,Mg-In_(2)O_(3)-x催化剂光热催化CO_(2)转化率及CO产生速率明显提高,这归因于Mg成功掺杂到In_(2)O_(3)晶格中,促进In_(2)O_(3)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。
To improve the catalytic activity of the photothermal CO_(2) hydrogenation In_(2)O_(3) catalyst,a Mg(OH)2‐In(OH)3 precursor was prepared by the homogeneous hydrothermal method,and a Mg‐doped In_(2)O_(3)-x(Mg‐In_(2)O_(3)-x)catalyst enriched with oxygen vacancies was obtained by the following high‐temperature calcination and H_(2)‐reducing treatment.The catalyst was evaluated for its photothermal catalytic performance of CO_(2) hydrogenation in a photothermal fixed‐bed reactor.The results demonstrated that Mg‐In_(2)O_(3)-x achieved an impressive CO_(2) 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 characterization results confirmed that the Mg doping into the In_(2)O_(3) lattice promotes the formation of more surface oxygen vacancies,which dramatically increases the response efficiency to visible light and slows down the recombination of photogenerated electron‐hole.This is the main reason for the enhancement of the photothermal catalytic performance.
作者
李纹龙
贾忻宇
凌洁
马梦丹
周安宁
LI Wenlong;JIA Xinyu;LING Jie;MA Mengdan;ZHOU Anning(College of Chemistry&Chemical Engineering,Xi′an University of Science and Technology,Xi′an 710054,China;Key Laboratory of Coal Resources Exploration and Comprehensive Utilization,Ministry of Natural Resources,Xi′an,Shaanxi 710054,China)
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2024年第5期919-929,共11页
Chinese Journal of Inorganic Chemistry
基金
国家自然科学基金(No.51674194)
陕西省自然科学基础研究计划一般项目-青年项目(No.2022JQ-111)资助。
关键词
氧化铟
光热催化
CO_(2)加氢
掺杂
氧空位
indium oxide
photothermal catalysis
CO_(2)hydrogenation
doping
oxygen vacancy