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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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预处理对Ni-Co双金属沼气重整催化剂性能与结构的影响
DOI: 10.1016/S1872-2067(12)60648-2, PP. 1826-1832
Keywords: 预处理,镍钴催化剂,沼气重整,抗积碳性能,制氢
Abstract:
？采用过量浸渍法制备了Ni-Co/La2O3-γ-Al2O3双金属催化剂,并使用固定床石英反应器在850℃,0.1MPa和空速为6000mLgcat-1h-1的条件下考察了预处理对催化剂性能的影响.运用X射线衍射、热重-差示扫描量热、透射电子显微镜、扫描电镜和X射线能谱分析等手段对催化剂进行了表征.结果表明,与传统氢气还原预处理相比,经氢气和二氧化碳预处理后,催化剂性能明显提高,且能基本消除该催化剂上沼气重整反应的诱导期.511h的稳定性实验结果表明,催化剂经氢气和二氧化碳预处理后具有很好的稳定性和抗积碳性,平均积碳速率仅为0.2mggcat-1h-1.表征结果显示,经氢气和二氧化碳预处理后,催化剂具有更好的抗烧结和抗积碳性能,反应后金属颗粒较小,分布较均匀,粒径分布范围较窄,从而增强了催化剂的稳定性.
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