摘要
采用共沉淀法制备了Ce0.65Zr0.35O2(CZ)储氧材料,在传统的水陈化体系中引入了乙醇,研究了乙醇的加入对CZ储氧材料性能的影响.对所制备样品进行了傅里叶变换红外(FTIR)光谱、X射线光电子能谱(XPS)、粉末X射线衍射(XRD)、扫描电镜(SEM)、N2吸附-脱附、储氧量(OSC)和H2程序升温还原(H2-TPR)的表征,并考察了以CZ储氧材料为载体制备的单钯催化剂的三效性能.结果表明,乙醇引入陈化体系对样品的结构和性能有显著影响.以醇水共存体系陈化制备的CZ储氧材料颗粒小、堆积松散、孔径分布宽、孔容大,具有优异的储氧性能和热稳定性,经1000°C焙烧后,比表面积为29.3m2·g-1,储氧量仍高达520μmol·g-1.以此为载体制备的单钯催化剂,空燃比操作窗口宽,对C3H8、CO、NO的转化明显优于水陈化体系制备的储氧材料所制备的催化剂.
Ce0.65Zr0.35O2 (CZ) mixed oxides were prepared by coprecipitation. The influence of ethanol on the performance of CZ and Pd based three-way catalysts was investigated. Samples were characterized by Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), scanning electron microscopy (SEM), nitrogen sorption, oxygen storage capacity (OSC), and hydrogen temperature-programmed reduction (H2-TPR) techniques. The precipitation aging method had an appreciable impact on oxide structure and catalyst performance. Samples aged in ethanol-water system exhibited wide pore-size distributions, large pore volumes and high redox properties, OSC and thermal stabilities. After calcination at 1000℃, the specific surface area and OSC of the samples were 29.3 m2·g^-1 and 520 μmol·g^-1, respectively. The excellent structural and textural properties resulted in a high catalytic activity, wide air-to-fuel operating range, and low light-off and full-conversion temperatures to C3H8, CO, and NO of the corresponding three-way catalyst.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2013年第5期1097-1106,共10页
Acta Physico-Chimica Sinica
基金
国家自然科学基金(21173153)
四川省科技厅科技支撑项目(2011GZ0035)资助~~