铈锆固溶体的微波辅助法制备及表征

Characterization of Cerium-Zirconium Solid Solutions Prepared by the Microwave-Assisted Approach

采用共沉淀法并结合不同的老化处理方式(室温陈化、常规加热回流和微波辅助加热回流)制备了Ce0.6Zr0.4O2固溶体。利用SEM、N2吸附、XRD、Raman光谱和H2-TPR等技术对样品的形貌、比表面积、孔结构、晶相结构、高温热稳定性和还原性进行了表征,并考察了其对CO氧化反应的催化性能。结果表明,微波辅助加热回流老化处理所制备的固溶体属于立方萤石结构,颗粒的大小均匀,表面结构疏松,具有最大的比表面积和孔容、最高的热稳定性及最好的低温还原性。CO氧化实验表明微波辅助加热回流老化处理所制备的Ce0.6Zr0.4O2固溶体具有最好的催化氧化活性。

Three Ce0.6Zr0.4O2 solid solutions were prepared by co-precipitation approach combined with room temperature aging, conventional heating reflux and microwave-assisted heating reflux. Their morphology, surface area, pore structure, crystalline structure, thermal stability and reduction features were characterized by using scanning electron microscope （SEM）, adsorption of nitrogen, X-ray diffraction （XRD）, Raman spectroscopy and temperature-programmed reduction of H2 （H2-TPR）. The results indicated that the Ce0.6Zr0.4O2 sample prepared by microwave-assisted heating reflux was of cubic fluorite structure, had a spongy appearance and homogeneous particles, and the largest specific surface area, pore volume, pore diameter, best thermal stability and lowtemperature reduction features. It also exhibited better catalytic activity for CO oxidation than other samples.