低碳化学与化工2025，Vol.50Issue(8)：133-143,11.DOI:10.12434/j.issn.2097-2547.20250078
Mn2O3@SiO2载氧体用于乙烷化学链氧化脱氢制乙烯性能研究
Performance study of Mn2O3@SiO2 oxygen carrier for chemical looping oxidative dehydrogenation of ethane to ethylene
摘要
Abstract
Chemical looping oxidative dehydrogenation(CL-ODH)of ethane is a green and efficient process that uses lattice oxygen of oxygen carrier to convert ethane into ethylene.However,this process often faces the problem that the reaction activity or ethylene selectivity is difficult to balance,resulting in low ethane conversion rate or ethylene selectivity.A design strategy of SiO2 coated Mn2O3 oxygen carriers was proposed,and Mn2O3@SiO2 oxygen carriers with different n(Mn)/n(Si)were synthesized.XRD,N2 physical absorption/desorption,H2-TPR and XPS were used to characterize the crystal structures,textural properties,reduction properties and surface species chemical states of the oxygen carriers.The results show that SiO2 forms a coating layer on the surface of Mn2O3,which can optimize the pore structure and increase the specific surface area of oxygen carriers,reduce the grain size of Mn2O3,improve the dispersion,and thus improve the reaction activity.At the same time,the introduction of SiO2 enhances the near-surface Mn—O binding energy,reduces the release rate of lattice oxygen,reduces the content of non-selective oxygen species on the surface and significantly improves the ethylene selectivity.Under the conditions of 700℃,20%C2H6/80%Ar(50 mL/min),reaction time of 2 min,with the Mn2O3@SiO2 oxygen carrier(n(Mn)/n(Si)is 0.9),ethane conversion achieves 42.8%and ethylene selectivity achieves 73.4%.关键词
化学链/乙烷脱氢/纳米Mn2O3/介孔SiO2Key words
chemical looping/ethane dehydrogenation/nanoscale Mn2O3/mesoporous SiO2分类
化学化工引用本文复制引用
王智超,梁威,刘根,孙仲顺,李美昕,杨伯伦,孙冰,吴志强..Mn2O3@SiO2载氧体用于乙烷化学链氧化脱氢制乙烯性能研究[J].低碳化学与化工,2025,50(8):133-143,11.基金项目
国家自然科学基金(22038011,52476223) （22038011,52476223）
化学品安全全国重点实验室开放课题(SKLCS-2024003) （SKLCS-2024003）
中央高校基本科研业务费专项资金(xzy012023074). （xzy012023074）
