采用浸渍法制备了Ce0.8La0.2O1.9同溶体负载Pt催化剂,用于气相巴豆醛选择加氧反应中.采用X射线粉末衍射、程序升温还原、NH3程序升温脱附和拉曼光谱等技术对催化剂进行了表征.结果表明,随着Pt负载量增加,Pt/Ce0.8La0.2O1.9催化剂活性(TOF)和巴豆醇选择性均先增加后降低.当Pt负载量为3%时,反应TOF值和巴豆醇选择性最高,分别为4.01×10-3s-1和53.6%.催化剂性能取决于催化剂表面酸性和Pt晶粒大小,反应过程中催化剂表面积炭是导致催化剂活性和选择性下降的主要原因.
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