摘要
分别在TG和TPO上考察了CeO2,ZrO2及不同Ce/Zr比的CexZr1-xO2固溶体催化剂上soot的燃烧性能,同时考察了反应气氛对活性的影响.结果表明:Ce基催化剂能明显降低soot的起燃温度,Ce/Zr比的不同导致CexZr1-xO2催化剂性能的差异.反应的速度控制步骤随O2浓度的不同而改变;H2O对Ce0.5Zr0.5O2上soot的氧化活性基本没有影响;由于NO氧化产生的NO2具有更强的的氧化能力,因此NO对soot的燃烧具有促进作用,起燃温度降低了30℃.催化剂上的β氧种参与了soot燃烧过程.
Catalytic performances of Ce/Zr series catalysts （CexZ1-xO2 ） on soot combustion and the influence of feed gas were investigated by TG and TPO. The catalytic activity is high, and affects by the Ce/Zr ratio. The concentration of O2 affects the speedlimited step during the process of soot combustion. H2O showed no effect on the catalytic activity for soot combustion on Ce0.5Zr0.5O2. NO could promote soot combustion by presenting NO2, a more powerful oxidant than O2, and the ignition temperature of soot decreased 30℃. Results of TG and TPO show that the β species oxygen on the catalyst take part in the combustion process.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2005年第5期7-11,共5页
Environmental Science
基金
国家高技术研究发展计划(863)项目(2001AA324050)
国家重点基础研究发展规划(973)项目(2004CB719500)
