摘要
研究了传统沉淀法和分步沉淀对CeO_(2)-ZrO_(2)-Y_(2)O_(3)-La_(2)O_(3)(CZ)材料结构和性能的影响.N_(2)-吸/脱附、OSC、H_(2)-TPR和催化剂三效活性等测试结果表明:分步沉淀所制备的CZ材料表现出更优的氧化还原性能和织构性能.基于此,继续优化分步沉淀中晶种的含量(10%、50%、90%),结果表明:较少的晶种诱导可以极大程度提高材料热稳定性能和织构性能,但进一步增加晶种含量对材料热稳定性能提升作用不明显.其中,当晶种量为10%时,所得CZ材料在高温焙烧后仍保持最大比表面积及稳定的立方相结构,表现出最好的织构性能和热稳定性能,其负载的单Pd三效催化剂也因此表现出最优的三效催化活性.
The effects of traditional precipitation method and stepwise precipitation method on the structure and properties of CZ materials were studied comparatively.The results of N_(2)-adsorption and desorption,OSC,H_(2)-TPR and three-way activity showed that the CZ materials prepared by the stepwise precipitation method exhibited better redox properties and texture properties.Based on this,we continued to optimize the content of crystalline species(10%,50%,90%)and found that less seed crystal induction could greatly improve the thermal stability and texture properties of the material,and the thermal stability performance promotion was not obvious with the increase of crystalline species content.Among them,when the seed amount was 10%,after calcination at 900℃for 4 h,it still maintained the largest surface area and a stable cubic phase structure.The obtained CZ material exhibited the best texture properties and thermal stability,and thus its loaded Pd-only three-way catalyst exhibited the best three-way catalytic activity.
作者
熊芬
王希诚
黄硕
李明桓
高祥达
XIONG Fen;WANG Xi-cheng;HUANG Shuo;LI Ming-huan;GAO Xiang-da(Technology Center of Dongfeng Motor Group Co.,Ltd,Wuhan 430058,China)
出处
《分子催化》
CAS
CSCD
北大核心
2023年第2期130-141,共12页
Journal of Molecular Catalysis(China)
关键词
分步沉淀
CeO_(2)基材料
热稳定性
单Pd三效催化剂
尾气净化
stepwise precipitation method
CeO_(2)-based material
thermal stability
Pd-only three-way catalysts
exhaust purification
