Sn催化剂对柴油车排气颗粒去除效果

制备了以Sn为活性组分，以Cu、K、V为助催化剂，以TiO₂/γ-Al₂O₃/堇青石为载体的催化剂，催化剂在700℃下于空气中在马弗炉活化3h.采用DSC/TG测试方法确定催化剂的活性.研究发现，以Sn为活性组分的催化剂能显著降低颗粒的起燃温度和扩大燃烧温度范围，Cu、 K、V的添加能进一步降低起燃温度，而燃烧温度范围却稍有所变窄.活化会降低催化活性，活化导致活性下降的原因不是由催化剂的烧结引起的，而是由活性组分的挥发流失造成的.

Sn CONTAINING CATALYST FOR PARTICULATE REMOVAL FROM DIESEL EXHAUST GASES

The catalytic oxidation traps seem to be one of the best ways for diesel particulate removal from exhaust gases thanks to their simplicity, easy handling, high abatement efficiency and comparatively low cost.The catalyst contained in such device should lower down soot ignition temperature to the values characteristic of diesel exhaust (180～350 ℃).This paper concerns the development of catalyst for catalytic oxidation traps.Sn catalyst was loaded on TiO₂ and γ-Al₂O₃-coated cordierite honeycomb and the catalysts were modified by Cu,K,V.The catalysts were activated in air in a muffle oven at 700℃ for 3 h.Catalyst activity was checked through DSC/TG experiments.Sn catalysts remarkably decreased soot ignition temperature and enlarge combustion temperature range.Along with adding Cu,K,V, the ignition temperature made further decrease and combustion temperature range narrowed slightly.The activation processes resulted in activity decrease.The reason for activity decrease was not caused by sintering,but by lapse of activity component.