摘要
用柠檬酸法制备了不同贵金属取代的钙钛矿LaCo0.96X0.04O3(X为Pt、Pd、Rh、Au、Ag)催化剂,用热重法测试了催化剂对碳烟的催化活性,采用程序升温还原法(H2-TPR)、X-射线衍射仪(XRD)、能量谱仪(EDS)和红外光谱(FTIR)对催化剂进行了测试.结果表明,催化剂LaCo0.96Ag0.04O3催化活性最高,起燃温度为449℃,远低于LaCoO3的504℃;各贵金属取代的钙钛矿LaCoO3的TPR还原峰变化各异;XRD特征峰的衍射角向高角度偏移,说明各贵金属进入了钙钛矿结构相;能谱图显示各贵金属进入钙钛矿相的量不同.
LaCo0.96X0.0403 （X=Pt, Pd, Rh, Au, Ag） catalysts were prepared by citric method. The catalytic activity of catalysts on soot was determined by thermogravimetry （TG）. Catalysts were characterized by temperature-programmed reduction （H2-TPR）, X-ray diffraction （XRD）, energy dispersive spectrograph （EDS） and Fourier transform infrared spectroscopy （FTIR）. The catalytic perfomance of LaCo0.96Ag0.04O3 on soot was the most activated with the ignition temperature of 449℃, lower than 504℃ of LaCoO3. TPR patterns of precious metal-substitued LaCoO3 differed. Diffraction angles of XRD characteristic peaks moved to high angles, meaning the entering of various precious metals in LaCoO3 phase. And energy dispersive spectra showed the contents of various precious metal in pernvskite phase varied.
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2009年第9期924-928,共5页
China Environmental Science
基金
广东省社会发展攻关资助项目(2302950B)
