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首页> 外文期刊>Bulletin of the Chemical Society of Japan >Factors Affecting the Catalytic Performance of La-K-Mn-O Perovskite Oxides for Diesel Soot Oxidation
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Factors Affecting the Catalytic Performance of La-K-Mn-O Perovskite Oxides for Diesel Soot Oxidation

机译：影响La-K-MN-O Perovskite氧化物用于柴油烟灰氧化催化性能的因素

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摘要

Soot combustion performance of K-containing perovskite oxides, La0.8K0.2MnO3(LKM82), was evaluated under tight- and loose-contact conditions. The perovskite oxides were prepared by evaporation-to-dryness methods using malic acid or citric acid as the complexing reagents. Catalyst surface area, surface K concentration, and morphology of the LKM82 catalysts can be controlled by changing the preparation conditions. The temperature of soot combustion decreased with increasing catalyst surface area and surface K concentration of the LKM82 catalysts, indicating that these are important factors controlling the soot combustion performance. The increase in surface area and surface K concentration of the LKM82 catalysts improved soot ignition activity and promoted the soot combustion reaction after ignition. In the loose-contact mode, the ratio of the amount of catalytically combusted soot to that of non-catalytically combusted soot increased with an increase in catalyst surface area and surface K concentration of the LKM82 catalysts. The apparent activation energy of the catalytic soot combustion with the perovskite oxides that have both high surface area and high surface K concentration was much lower than that of non-catalytic soot combustion.
机译：在紧密和松散的条件下评价含k含钙钛矿氧化物的烟灰燃烧性能，La0.8k0.2mNO3（LKM82）。通过使用苹果酸或柠檬酸作为络合试剂，通过蒸发 - 干燥方​​法制备钙钛矿氧化物。通过改变制备条件，可以控制LKM82催化剂的催化剂表面积，表面k浓度和形态。随着LKM82催化剂的催化剂表面积和表面k浓度的增加，烟灰燃烧的温度降低，表明这些是控制烟灰燃烧性能的重要因素。 LKM82催化剂的表面积和表面k浓度的增加改善了烟灰点火活性，并在点火后促进烟灰燃烧反应。在松散接触模式中，随着LKM82催化剂的催化剂表面积和表面k浓度的增加，催化燃烧的烟灰量与非催化燃烧的烟灰的比率增加。具有高表面积和高表面k浓度的钙钛矿氧化物的催化烟灰燃烧的表观活化能量远低于非催化烟灰燃烧的钙质氧化物。

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