中文摘要：

利用水热法制备了一种具有花朵状形貌的铈钛复合氧化物,该复合氧化物主要暴露CeO2{100}晶面。SEM、XRD表征结果表明,花朵状铈钛复合氧化物的形成主要分为两个阶段,即无定型的快速生长及缓慢结晶两个过程;在制备过程中,铈钛比例、KOH浓度、晶化时间和焙烧温度是该形貌形成的主要影响因素。其负载Au催化剂后常温即能实现CO的完全转化;TEM和H2-TPR结果表明,暴露的CeO2{100}晶面以及Au和载体的强相互作用是该催化剂具有高活性的主要原因。

英文摘要：

In this work, a flower-like CeTiOx composite oxide, predominantly exposing CeO2{100} plane, was synthesized by a simple hydrothermal method. The SEM and XRD results revealed the growth mechanism of CeTiOx composite oxide can be divided into two stages, including the rapid growth of amorphous and the following crystallization. The ratio of Ce/Ti, KOH concentration, crystallization time and calcination temperature are the key factors for the synthesis of the flower-like CeTiOx composite oxide. Au catalyst supported on this composite oxide exhibited superior activity for CO oxidation at room temperature. The TEM and H2-TPR results suggested that the exposed CeO2{100} plane and the strong interaction between Au and CeTiOx composite oxide are responsible for the high activity.