低碳化学与化工2025，Vol.50Issue(9)：10-16,7.DOI:10.12434/j.issn.2097-2547.20240491
锰氧化物的低浓度甲烷催化氧化性能研究
Study on catalytic oxidation performance of manganese oxides for low concentration methane
吕人杰 1樊昱辰 2刘祎琳 3田大林 1王斌荣 1张浩 1由长福 4王海名2
作者信息
- 1. 中煤昔阳能源有限责任公司白羊岭煤矿,山西 晋中 045300
- 2. 清华大学 山西清洁能源研究院,山西 太原 030032
- 3. 清华大学 山西清洁能源研究院,山西 太原 030032||太原理工大学 化学与化工学院,山西 太原 030024
- 4. 怀柔实验室山西研究院,山西 太原 030032
- 折叠
摘要
Abstract
The ventilation air methane emitted during coal mining is a significant source of methane emissions.Due to the low concentration and large emission of methane,its large-scale treatment is difficult.Catalytic oxidation technology can effectively remove low-concentration methane at relatively low temperatures,with a key focus on developing low-cost and high-performance catalysts.Manganese oxides with different oxidation valance states and crystal phases were investigated to explore the catalytic oxidation performances of low concentration methane in a fixed-bed reactor.TG,XRD,SEM,XPS and H2-TPR were used to characterize and analyze the physicochemical properties of catalysts and explore the possible reaction mechanisms.The results show that MnO2(β-MnO2)has higher catalytic activity than Mn2O3,and the activation temperature(t10)and complete oxidation temperature(t90)of MnO2 are 365℃and 505℃,respectively,which are significantly lower than those of Mn2O3(t10=655℃,t90=795℃).TG analysis shows that MnO2 gradually losts oxygen and transforms into Mn2O3 above 550℃,which may affect the activity of catalysts.At the same valence state,α-MnO2 demonstrates superior methane catalytic oxidation performance compared to β-MnO2.t90 of α-MnO2 is 433℃.The H2-TPR results shows that α-MnO2 has a lower reducing temperature and thus higher lattice oxygen activity.After 24 h reaction at 550℃,the methane conversion rate of α-MnO2 decreases by approximately 8%,indicating that further improvements are needed to enhance the stability of manganese oxides catalysts.This study can provide reference for the development of cost-effective manganese-based catalysts for methane oxidation.关键词
锰氧化物/晶相/甲烷催化氧化/催化活性Key words
manganese oxide/crystal phases/methane catalytic oxidation/catalytic activity分类
化学化工引用本文复制引用
吕人杰,樊昱辰,刘祎琳,田大林,王斌荣,张浩,由长福,王海名..锰氧化物的低浓度甲烷催化氧化性能研究[J].低碳化学与化工,2025,50(9):10-16,7.
