不同支撑材料对Na-Mn2O3载氧体化学链甲烷氧化偶联性能的影响OA北大核心CSTPCD
Effects of different supports on performance of Na-Mn2O3 oxygen carrier for chemical-looping oxidative coupling of methane
采用浸渍法制备了 3 种具有稳定多孔结构的支撑材料(SiO2,MgO,TiO2)负载的Na-Mn2O3 载氧体,采用XRD、N2 吸附-脱附、SEM、H2-TPR等方法对载氧体的微观结构进行表征,研究了不同还原温度下各种支撑材料对Na-Mn2O3 载氧体化学链甲烷氧化偶联性能的影响.实验结果表明,支撑材料主要影响载氧体的催化活性和储氧能力,SiO2 比MgO和TiO2 具有更发达的孔结构和更高的比表面积,Na-Mn2O3/SiO2 的催化性能最佳,在 800℃下C2 选择性达 74.25%、C2 产率为14.12%;Na-Mn2O3/SiO2 和Na-Mn2O3/MgO具有较好的结构稳定性,活性组分具有较好的晶格氧稳定性;MgO与Mn2O3 的前体在载氧体制备过程中化学反应最显著,形成了Mg6MnO8 并产生较高的储氧能力.
Three Na-Mn2O3 oxygen carriers(OCs)supported by different inert supports(SiO2,MgO,TiO2)with stable porous structure were prepared by impregnation method.The microstructures of OCs were characterized by XRD,N2 adsorption-desorption,SEM and H2-TPR.The effects of supports on the performance of Na-Mn2O3 OCs in chemical-looping oxidative coupling of methane were investigated at various temperatures.The experimental results show that the supports exhibited strong influences on the catalytic activity and oxygen transport capacity of OCs.SiO2 possesses a more porous structure and higher specific surface area as compared to MgO and TiO2.Na-Mn2O3/SiO2 exhibits the best catalytic performance with 74.25%of C2 selectivity and 14.12%of C2 yield at 800℃.Na-Mn2O3/SiO2 and Na-Mn2O3/MgO show good structural stability and lattice oxygen stability.During the preparation of OCs,the precursor of MgO supports strongly interact with the precursor of Mn2O3,forming Mg6MnO8 and resulting in higher oxygen storage capacity.
毛瑞;陈良勇
东南大学 能源与环境学院,江苏 南京 210096
化学工程
化学链甲烷氧化偶联载氧体支撑材料催化反应
chemical-loopingoxidative coupling of methaneoxygen carriersupportcatalytic reaction
《石油化工》 2024 (003)
305-313 / 9
国家自然科学基金面上项目(52076042).
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