摘要
采用改进的柠檬酸溶胶-凝胶法(即前驱体先在N2气氛下高温预处理)制备了高比表面积纳米Ce0.9Cu0.1O2-δ固溶体。采用XRD、TEM和Raman等对催化剂进行表征,并考察了它们的低温CO氧化性能。研究结果表明,改进的柠檬酸溶胶-凝胶法可以制得晶相比较完整的Ce0.9Cu0.1O2-δ固溶体,晶粒小于10 nm,明显小于常规方法制得的样品。随着样品焙烧温度的提高,表征氧缺位的600 cm-1左右Raman峰的位置向高波数方向迁移。采用改进方法制得的Ce0.9Cu0.1O2-δ固溶体具有更高的CO氧化活性,其原因归结为晶粒的减小,容易形成氧缺位和表面高分散CuO的增加,从而促进了CO的氧化。
Nanostructured Ce0.9Cu0. 1O2-δ solid solution was prepared by modified citrate sol-gel method （the precursor being pretreated in N2 at high temperature）. The sample was characterized by XRD, TEM, and Raman spectrometry, and its catalytic activity for CO oxidation investigated. It was found that the modified citrate sol-gel method prepared Ce0.9Cu0.1O2-δsolid solution with less than 10 nm, much smaller than that prepared by conventional method. ultrafine crystallite size of The Raman peak at about 600 cm^-1, attributed to oxygen vacancies, shifted with increasing calcination temperature to higher wave-number. Solid solution prepared by the modified method exhibited higher catalytic activity for CO low temperature oxidation. This might be attributed to easier formation of oxygen vacancies and increase in finely dispersed CuO species resulting from decrease of the crystalline size.
出处
《工业催化》
CAS
2007年第1期55-58,共4页
Industrial Catalysis
基金
国家自然科学基金资助项目(20473075)
