摘要
在氧化还原法制备α-MnO_(2)的基础上,通过控制焙烧温度和气氛制备了Mn_(3)O_(4)催化剂,系统考察了其甲苯催化性能。结果显示,Mn_(3)O_(4)催化性能优于MnO_(2),并且在230℃下保持转化率90%以上稳定运行100 h。原位红外等表征结果表明,与MnO_(2)相比,Mn_(3)O_(4)具有适当的氧化还原能力、更高的晶格氧活性、更多的表面吸附氧和更强的甲苯吸附能力,促使催化剂表面苯甲酸物种的快速转化,进而提高其甲苯催化性能。本研究可为锰基催化剂的制备及其甲苯催化氧化性能提升机理研究提供参考。
The Mn_(3)O_(4)catalyst was synthesized by controlling the calcination temperature and atmosphere based on the redox method for the preparation ofα-MnO_(2).Their catalytic performance was systematically investigated.The results showed that Mn_(3)O_(4)has greater catalytic properties than that of MnO_(2),its conversion rate was kept above 90%for 100 h at 230℃.In situ infrared and other series of characterization results show that compared with MnO_(2),Mn_(3)O_(4)has appropriate redox ability,higher lattice oxygen activity,more surface adsorbed oxygen and stronger toluene adsorption ability,which promotes the benzoic acid species on the surface of the catalyst and rapid conversion,thereby improving its toluene catalytic performance.This work can serve as a guide for the development of manganese-based catalysts and their mechanism for toluene catalytic oxidation performance enhancement.
作者
王辰
史秀锋
武鲜凤
魏方佳
张昊虹
车寅
吴旭
WANG Chen;SHI Xiufeng;WU Xianfeng;WEI Fangjia;ZHANG Haohong;CHE Yin;WU Xu(College of Chemical Engineering and Technology,Taiyuan University of Technology,Taiyuan 030024,Shanxi,China;College of Chemistry,Taiyuan University of Technology,Taiyuan 030024,Shanxi,China)
出处
《化工学报》
EI
CSCD
北大核心
2023年第6期2447-2457,共11页
CIESC Journal
基金
国家自然科学基金项目(51978436,22178244)
山西省应用基础研究计划项目(20210302123118)。
