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Non-stoichiometric perovskite oxide oxidation catalyst for oxidizing NO to NO2
Non-stoichiometric perovskite oxide oxidation catalyst for oxidizing NO to NO2
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机译:用于将NO氧化为NO 2 Sub>的非化学计量钙钛矿氧化物氧化催化剂
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摘要
A non-stoichiometric perovskite oxide having the general chemical formula LaXMnOY, in which the molar ratio of lanthanum to manganese (“X”) ranges from 0.85 to 0.95, can be used in particle form as an oxidation catalyst to oxidize NO to NO2 in an exhaust aftertreatment system for a hydrocarbon-fueled engine. The oxygen content (“Y”) fluctuates with variations in the molar ratio of lanthanum to manganese but generally falls somewhere in the range of 3.0 to 3.30. The crystal lattice adjustments spurred by the non-stoichiometric molar ratio of lanthanum to manganese are believed responsible for an enhanced NO oxidative activity relative to similar perovskite oxides with a higher molar ratio of lanthanum and manganese.
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机译:一种非化学计量的钙钛矿氧化物,其化学通式为La X Sub> MnO Y Sub>,其中镧与锰的摩尔比(“ X”)为0.85至0.95,可以以颗粒形式用作氧化催化剂,用于将碳氢化合物发动机的排气后处理系统中的NO氧化为NO 2 Sub>。氧含量(“ Y”)随镧与锰的摩尔比的变化而波动,但是通常落在3.0至3.30的范围内。相对于镧和锰的摩尔比较高的类似钙钛矿氧化物,由镧与锰的非化学计量摩尔比所激发的晶格调节被认为是导致NO氧化活性增强的原因。
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