采用溶胶-凝胶法制备了系列Ce1-xMnxO2催化剂,运用BET,XRD,Raman,XPS和H2-TPR等方法对催化剂进行了表征.并考察了催化剂对CH2Cl2催化氧化的性能.XRD结果表明,催化剂中Ce的加入可以有效抑制催化剂晶粒变大,且有部分Mn离子进入CeO2骨架中形成了固溶体;而XPS结果表明,催化剂中Mn物种以+3和+4价存在.H2-TPR结果表明,催化剂中Ce的加入降低了Mn0,中晶格氧的还原温度.反应活性结果表明,Ce1-x MnxO2系列催化剂较纯CeO2,MnOx催化活性好,其本征活性顺序为Ce0.8Mn0.2O2>Ce0.6Mn0.4O2>Ce0.5Mn0.5O2>Ce0.4Mn0.6O2>Ce0.2Mn0.8O2>CeO2>MnOx.这可能是由于Ce的添加提高了催化剂中MnOx晶格氧的活泼程度,进而影响反应性能.
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