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OALib Journal期刊
ISSN: 2333-9721
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硬模板法制备铈基复合氧化物及其对甲苯燃烧的催化性能
, PP. 483-489
Keywords: 硬模板法,铈基复合氧化物,固溶体,甲苯,催化燃烧
Abstract:
？采用硬模板法制得cem-ht(m=cu、mn、fe和co)复合氧化物催化剂,借助xrd、bet、o2-tpd和h2-tpr研究了催化剂的物理化学性质,通过甲苯催化燃烧探针反应评价了催化剂的催化性能。结果表明,cuo、mnox、feox和co3o4能溶入ceo2晶格形成ce-o-cu、ce-o-mn、ce-o-fe和ce-o-co固溶体,cu和mn离子的溶入导致ceo2晶格发生了较大程度的晶格畸变,fe和co离子对ceo2晶格的影响较小,且在ceco-ht氧化物催化剂中还存在微量晶相co3o4。所制得的cem-ht氧化物催化剂表现出了优越的甲苯催化燃烧性能,在反应温度为300、270、260和230℃时,cefe-ht、ceco-ht、cemn-ht和cecu-ht氧化物催化剂上甲苯的催化燃烧转化率分别达93.7%、95.0%、96.5%和95.0%以上。ce基复合氧化物催化剂的甲苯催化燃烧活性顺序与其氧脱附性能、储氧性能和可还原性能具有正相关性,遵从顺序为cecu-ht>cemn-ht>ceco-ht>cefe-ht。
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