以CeO2-TiO2复合氧化物为载体,La0.8Ce0.2MnO3为活性组分制备了负载型钙钛矿催化剂.并以TiO2、CeO2负载钙钛矿作为对比,考察了催化剂的活性.La0.8Ce0.2MnO3/CeO2-TiO2的催化活性最高,起燃温度和完全转化温度分别为140和255℃,通过采用XRD、BET、SEM、NH3-TPD、H2-TPR等手段,探讨了载体的结构性质与催化剂活性的关系.结果表明,催化剂的孔结构、表面酸性和还原性是影响催化剂活性的主要因素.Ce、Ti复合之后,CeO2-TiO2主要以CeTi固溶体的形式存在,比表面积和孔容较大,催化剂表面酸性明显增强,从而使得钙钛矿在CeO2-TiO2的表面均匀分散,有效地改善了La0.8Ce0.2MnO3/CeO2-TiO2催化剂的氧化还原能力,使催化剂活性增强.
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