催化学报
doi:10.1016/S1872-2067(09)60059-0
LaMn_(1-x)Cu_xO_(3±δ) perovskite oxides (x = 0, 0.2, 0.4, 0.6, 0.8, 1) were prepared by two different methods, the Pechini and sol-gel methods. The catalysts were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), X-ray fluorescence spectroscopy, N_2 adsorption, and temperature-programmed reduction. Their catalytic activity in the oxidation of methane and CO was evaluated. EDS and SEM results showed that the Pechini samples had more homogeneity and smaller particles (higher specific surface area). The catalytic activity for methane combustion was highest for x = 0.2. In CO oxidation, the oxides with x = 0.2 and x = 0.4 were the most active. The Pechini samples had higher activity and stability than the sol-gel samples.
关键词:
perovskite
,
Pechini
,
sol-gel
,
methane combustion
,
carbon monoxide oxidation
伍媛婷
,
王秀峰
,
宋峰涛
,
仝小飞
功能材料与器件学报
doi:10.3969/j.issn.1007-4252.2012.04.010
采用超声St(o)ber法制备了单分散性的纳米载体SiO2,再采用Pechini溶胶-凝胶制备法制备出SiO2/TiO2复合微球.通过X射线衍射仪、场发射扫描电子显微镜(FESEM)对粉体的晶型和显微形貌进行测试分析.结果表明:纳米载体SiO2球形颗粒为无定形态,Ti02粉体为形貌多样的块状颗粒,大颗粒粒径大于10μm；Ti/Si(摩尔比)的变化明显影响合成复合粉体的形貌和粒径,当Ti/Si=1∶3时可获得球形复合微球,且不存在块状颗粒.
关键词:
Pechini
,
溶胶-凝胶法
,
二氧化硅
,
二氧化钛
,
复合微球
王忠兵
,
赵春花
,
刘婧
,
杨萍华
,
陈初升
稀有金属材料与工程
采用Pechini方法合成了FeMnNiO4负温度系数(NTC)的复合氧化物,所制备的粉体在700℃时便可以完全转化为尖晶石相.合成的粉体有很高的烧结活性,在1 150℃即可烧结致密.通过改变制备过程中乙二醇的含量可以调整粒径的大小和烧结体中的NiO相的含量,从而调控NTC热敏电阻的电学性能.
关键词:
NTC
,
Pechini
,
热敏电阻
