Cr助剂对Fe基催化剂结构和费托合成性能的影响

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Cr助剂对Fe基催化剂结构和费托合成性能的影响

王虎林杨勇王洪青明相宏伟李永旺

Chinese journal of catalysis, 2010, Volume: 31, Issue: 7

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采用N2吸附-脱附、X射线衍射、穆斯堡尔谱、X射线光电子能谱、程序升温还原和热重分析等技术研究了助剂Cr含量对Fe基费托合成催化剂的织构性质、还原行为以及物相变化的影响.在H2/CO=2.0,260-300℃,1.5MPa和2000ml/（g·h）条件下,在固定床反应器中考察了Cr含量对Fe基催化剂费托合成反应活性和产物烃选择性的影响.结果表明,在氧化态催化剂中,Cr助剂与Fe物相存在较强的相互作用,形成固溶体相α-（Cr1-xFex）2O3;随着Cr含量的增加,逐渐由单一的富Fe相α-（Fe1-xCrx）2O3向富Fe相和富Cr相α-（Cr1-yFey）2O3两相过渡.Fe-Cr固溶体的生成显著抑制了催化剂的还原,导致催化剂还原度降低,因而催化剂活性下降.同时,Cr的添加提高了甲烷和轻质烃选择性,但抑制了水煤气变换活性.

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