微波辅助法制备铈锆固溶体在CO低温氧化反应中的应用

Application of Cerium-Zirconium Solid Solution Prepared by a Microwave-Assisted Method to CO Low-Temperature Oxidation

采用共沉淀法并分别结合室温老化、常规加热回流和微波辅助加热回流三种不同的处理方法制备了铈锆固溶体Ce0.6Zr0.4O2,并以其为载体制备了CuO/Ce0.6Zr0.4O2催化剂.采用N2吸附、X射线衍射和H2程序升温还原等技术对Ce0.6Zr0.4O2载体和CuO/Ce0.6Zr0.4O2催化剂的织构特性和可还原性进行了表征,另外还考察了CuO/Ce0.6Zr0.4O2催化剂对CO低温氧化反应的催化活性.结果表明,采用微波辅助加热回流处理方法制备的Ce0.6Zr0.4O2载体具有最大的比表面积(170.8m2/g)和孔容(0.408cm3/g),以其为载体所制备的CuO/Ce0.6Zr0.4O2催化剂,其CuO具有良好的分散性和低温可还原性,在CO低温氧化反应中表现出最好的催化活性.

Three different Ce0.6Zr0.402 solid solutions were prepared by the co-precipitation method combined with room temperature aging, conventional heating reflux, and microwave-assisted heating reflux and used as the supports to prepare CuO catalysts by an impregnation method. The textural and reductive properties of the Ce0.6Zr0.4O2 supports and CuO/Ce0.6Zr0.4O2 catalysts were characterized by N2 adsorp- X-ray diffraction, and temperature-programmed reduction by hydrogen. In addition, the catalytic activity of the catalysts for CO low-temperature oxidation was tested. The results showed that the support prepared by the microwave-assisted method has the largest surface area and pore volume （170.8 m^2/g and 0.408 cm^3/g, respectively）, and the CuO species loaded exhibited good dispersion and reducibility, which resulted in a high catalytic activity of the corresponding CuO/Ce0.6Zr0.4O2 catalyst for CO low-temperature oxidation.