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OALib Journal期刊
ISSN: 2333-9721
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LaMO3纳米复合钙钛矿氧载体化学循环重整甲烷制合成气
DOI: 10.3724/SP.J.1088.2011.10416, PP. 1411-1417
Keywords: 甲烷,化学循环重整,钙钛矿,B位离子,氧载体,合成气
Abstract:
？采用溶胶-凝胶法制备了不同B位可变价离子的LaMO3(M=Cr,Mn,Fe,Co)复合氧化物氧载体,采用X射线衍射、N2吸附-脱附、扫描电镜及CH4程序升温表面反应等手段对氧载体进行了表征,并用于直接选择氧化CH4的反应中.结果表明,Cr,Mn,Fe和Co均能形成LaMO3纳米复合钙钛矿结构,其氧物种氧化能力大小顺序为LaCoO3>LaMnO3>LaFeO3>LaCrO3.在连续流动化学循环甲烷重整反应中,LaFeO3中的氧物种具有更好的选择氧化性能(H2/CO=2.06),其CH4转化率和CO选择性分别达到89.6%和98.9%.10个连续顺序氧化-还原化学循环重整反应中,CH4转化率约为60%~70%,CO选择性达98%以上;且其结构保持了较高的稳定性.
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