Fe2O3/LaFe(Ni)O3载氧体在乙烷化学链氧化脱氢制乙烯中的应用OA
Application of Fe2O3/LaFe(Ni)O3 as oxygen carriers in chemical looping oxidative dehydrogenation of ethane to ethylene
乙烷化学链氧化脱氢(CL-ODH)制乙烯是一种将乙烷转化为高附加值产品的新工艺.采用柠檬酸络合法和浸渍法制备了 Fe2O3/LaFeO3 和 Fe2O3/LaNiO3 两种钙钛矿型复合氧化物载氧体,通过 N2 吸附-脱附、XRD、SEM、XPS、Raman、H2-TPR、O2-TPD 等表征手段分析了载氧体的物化性质,并考察了它们在乙烷CL-ODH 制乙烯反应中的催化性能.实验结果表明,两种载氧体均保持钙钛矿晶体结构,其中 Fe2O3 在 LaFeO3 上的分散性更好,晶格氧含量也高于 Fe2O3/LaNiO3.在反应温度650℃、反应压力0.1 MPa、空速15 000 mL/(g·h)的条件下,Fe2O3/LaFeO3 的催化活性优于Fe2O3/LaNiO3,乙烷转化率最高达 93%、乙烯选择性最高达 53%,在经过 10 次氧化-还原循环后仍保持优异的吸氧和释氧能力,是乙烷 CL-ODH 制乙烯反应的优良载氧体.
Chemical looping oxidative dehydrogenation(CL-ODH)of ethane to ethylene is a new route for converting ethane into high-value-added products.Two perovskite-type oxides Fe2O3/LaFeO3 and Fe2O3/LaNiO3 were prepared using the citric acid complexation method and impregnation method.Their physical and chemical properties were characterized by N2 adsorption-desorption,XRD,SEM,XPS,Raman,H2-TPR,and O2-TPD,and their catalytic activity in CL-ODH of ethane to ethylene was investigated.The results show that both Fe2O3/LaFeO3 and Fe2O3/LaNiO3 maintain the perovskite crystal structure.Fe2O3 has better dispersion on LaFeO3,and Fe2O3/LaFeO3 has higher lattice oxygen content than Fe2O3/LaNiO3.Under the conditions of 650℃,0.1 MPa,and space velocity of 15 000 mL/(g·h),Fe2O3/LaFeO3 exhibits a higher catalytic activity than Fe2O3/LaNiO3,achieving ethane conversion reaching up to 93%and ethylene selectivity of 53%.After 10 oxidation-reduction cycles,Fe2O3/LaFeO3 still maintains excellent oxygen absorption and release capabilities,which makes it an excellent oxygen carrier for CL-ODH of ethane to ethylene.
李昕梦;梁皓;陈俊杰;崔爽
沈阳理工大学 环境与化学工程学院,辽宁 沈阳 110159沈阳理工大学 环境与化学工程学院,辽宁 沈阳 110159沈阳理工大学 环境与化学工程学院,辽宁 沈阳 110159沈阳理工大学 环境与化学工程学院,辽宁 沈阳 110159
化学化工
乙烷氧化脱氢化学链乙烯载氧体钙钛矿型氧化物
ethane oxidative dehydrogenationchemical loopingethyleneoxygen carrierperovskite-type oxide
《石油化工》 2026 (5)
653-659,7
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