摘要
以溴化十六烷基三甲基铵(CTAB)为模板剂,采用并流法与正加法制备了铈锆钇稀土储氧材料。结果表明:并流法制备的样品具有高比表面积和储氧性能,经600℃焙烧后,其比表面积高达172.4 m2/g,储氧量为637.5μmol/g;高温老化处理后,储氧量仍高达590μmol/g,明显优于正加法制备的样品,表现出良好的抗老化能力和储氧性能。活性评价结果表明,含铈锆钇储氧材料的三效催化剂均能满足压缩天然气汽车和液化石油气汽车的排放要求,其中,液化石油气汽车的排放效果更佳。
Rare earth oxygen storage material CeO2 -ZrO2 -Y2O3 was prepared by parallel flow method using cetyhrimethyl ammonium bromide （CTAB） as template. For compared,CeO2 -ZrO2 -Y2O3 was also prepared by dropping NH3·H2O into inorganic salt. Results showed：CeO2 -ZrO2 -Y2O3 prepared by parallel flow method had higher surface area and oxygen storage capacity, which were in excess of 172.4 m^2/g and 637.5 μmol/g,respectively, after calcination at 600℃. Its oxygen storage capacity also maintained at about 590μmol/g after high temperature and aging processes, which showed the sample prepared by parallel flow method had excellent anti-aging capability and oxygen storage capacity. The catalytic performance evaluation showed that TWCs doping with CeO2-ZrO2-Y2O3 sample were all suitable for CNG automobiles and LPG automobiles, which have better active performance in LPG automobiles.
出处
《无机盐工业》
CAS
北大核心
2009年第1期20-23,共4页
Inorganic Chemicals Industry
