CAJ | 학술논문

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29.3 m2·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.
채용공침정법제비료Ce0.65Zr0.35O2(CZ)저양재료,재전통적수진화체계중인입료을순,연구료을순적가입대CZ저양재료성능적영향.대소제비양품진행료부리협변환홍외(FTIR)광보、X사선광전자능보(XPS)、분말X사선연사(XRD)、소묘전경(SEM)、N2흡부-탈부、저양량(OSC)화H2정서승온환원(H2-TPR)적표정,병고찰료이CZ저양재료위재체제비적단파최화제적삼효성능.결과표명,을순인입진화체계대양품적결구화성능유현저영향.이순수공존체계진화제비적CZ저양재료과립소、퇴적송산、공경분포관、공용대,구유우이적저양성능화열은정성,경1000°C배소후,비표면적위29.3 m2·g-1,저양량잉고체520μmol·g-1.이차위재체제비적단파최화제,공연비조작창구관,대C3H8、CO、NO적전화명현우우수진화체계제비적저양재료소제비적최화제.
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 °C, the specific surface area and OSC of the samples were 29.3 m2·g-1 and 520 μmol·g-1, respectively. The excel ent structural and textural properties resulted in a high catalytic activity, wide air-to-fuel operating range, and low light-off and ful-conversion temperatures to C3H8, CO, and NO of the corresponding three-way catalyst.