Ce-Cu/Ti-Al-O_x催化氧化CO的性能研究

Study on performance of Ce-Cu/Ti-Al-O_x for catalytic oxidation of CO

采用挤出成型法制备系列铜铈负载钛铝氧化物(Ce-Cu/Ti-Al-Ox)催化剂,研究Ce-Cu/Ti-Al-Ox催化氧化一氧化碳(CO)的性能,并对催化剂进行表征。结果表明:三氧化二铝(Al2O3)的掺入抑制了二氧化钛(TiO2)的颗粒长大,不仅增大了催化剂的比表面积,同时提高了铜铈负载二氧化钛(Ce-Cu/TiO2)催化剂的缺陷浓度,有利于催化剂表面反应气体的吸附以及催化反应的进行,因此适量添加Al2O3能明显提升Ce-Cu/TiO2催化剂的低温催化氧化活性,拓宽其活性温度窗口,添加20%(wt,质量分数)Al2O3制得的Ce-Cu/Ti-Al-Ox催化剂具有对催化氧化CO的最好催化活性,在140℃条件下,活性达到了98%,170℃以上活性达到了100%。

The series copper cerium supported titanium aluminum composite oxide(Ce-Cu/Ti-Al-Ox)catalysts were prepared by an extrusion method.The performance of the Ce-Cu/Ti-Al-Ox during catalytic oxidation of carbon monoxide(CO)was investigated and several tests were carried out to characterize the catalysts.Results showed that the additions of aluminum oxide(Al2O3)could inhibit the growth of titanium dioxide(TiO2)particles,which increased the specific surface areas and the defects species concentration of Ce-Cu/TiO2.It was beneficial for the adsorption of reaction gas and the enhancement of catalytic activity.Therefore,the appropriate addition of Al2O3 improved catalytic activity at the low temperature,and broadened the active temperature window.The Ce-Cu/Ti-Al-Ox catalyst prepared by adding 20wt%Al2O3 showed the best catalytic activity for catalytic oxidation of CO.It reached 98%CO conversion at 140℃and 100%CO conversion at 170℃.