铜铈钛复合氧化物的制备及其催化一氧化碳氧化反应的性能

Preparation and Catalytic Properties of Copper-cerium-titanium Mixed Oxides for Carbon Monoxide Oxidation

采用共沉淀法制备了不同钛含量的铜铈钛复合氧化物催化剂（Cu0.1CCe0.9-xTixO2，X=0～0．3），采用微反-色谱评价装置考察了Cu0.1Ce0.9-xTixO2催化CO氧化反应的活性，并采用氮吸附／脱附，X-射线衍射以及程序升温还原等技术对催化剂进行了表征。结果表明，适量Ti（X≤0．15）的加入，提高了Cu0.1Ce0.9-xTixO2催化剂中CuO的分散度，从而提高了其催化活性。而当Ti含量过高（X=0．3）时，Cu0.1Ce0.9-xTixO2催化剂中CuO的分散度反而降低，从而导致其催化活性显著降低。

A series of copper-cerium-titanium were prepared by co-precipitation method that is by mixings oxides with different amounts of titanium （Cu0.1Ce0.9-xTixO2）. Their catalytic properties for CO oxidation were evaluated by using a microreactor-GC system. The techniques of N2 adsorp- tion/desorption, X-ray diffraction （XRD） and temperature-programmed reduction by H2 （H2 - TPR） were employed for catalyst characterization. The results showed that the addition of proper amounts （x≤ 40.15） of titanium improved the dispersion of CuO in the catalyst and consequently resulted in the in- crease of the catalytic activity. However, the addition of too much amount of titanium （ x = 0.3） decreased the dispersion of Cu0 in the catalyst, so resulted in the significant decrease of the catalytic ac- tivity.