关键词: 柴油机, 颗粒物, 催化氧化, 含铜催化剂

Abstract: Catalysts Cu-K-V-［-Me（Me＝Pt‚MnO₂‚NiO‚or SnO₂）］／TiO₂／γ-Al₂O₃／cordierite were prepared and then mixed with the particulate matters （PMs） from a min-i type diesel engine．Thus‚the activities of the catalysts were tested by DSC and TG analyses．It is indicated by DSC analysis that the ignition temperature of soluble organic fraction （SOF） can be reduced to432．62K when Cu-K-V-SnO2is used‚which is much lower than the corresponding 523．27K when no catalyst is used．Cu-K-V-NiO can help reduce the temperature to687．97K for the combustion of graphitic solid fraction （GSF）．Furthermore‚the temperature for the complete combustion of PMs reaches only766．88 K with the presence of Cu-K-V-NiO．It is also indicated by TG analysis that the presence of Cu-K-V-NiO leads to an abatement efficiency of90．83％ at700．65K‚accompanied by91．6％ at710．05K for Cu-K-V-Pt‚and81．7％ at 725．65K for Cu-K-V-SnO₂‚respectively．The maximum reduction of soot reaches38％ when Cu-K-V-SnO₂ is used in real exhaust‚which is little higher than the value of25％～35％ for commercial products．

Key words: diesel, particulate matter, catalytic oxidation, copper-contained catalyst