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Copper doped BaMnO3 perovskite catalysts for NO oxidation and NO2-assisted diesel soot removal

机译：铜掺杂BaMnO 3 钙钛矿催化剂用于NO氧化和NO 2 辅助柴油烟灰的去除

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摘要

The activity for NO oxidation and for NO2-assisted diesel soot removal of a BaMn1?xCuxO3 (x = 0, 0.1, 0.2, 0.3) perovskite-type catalyst has been tested by Temperature Programmed Reaction (TPR) and isothermal experiments at 450 °C. Fresh and used catalyst characterization by ICP-OES, N2 adsorption, XRD, XPS, IR spectroscopy and H2-TPR was performed. Results showed that: (i) manganese is partially substituted by copper in the perovskite structure leading to the formation of a manganese-deficient perovskite with a new hexagonal structure, (ii) in BaMn1?xCuxO3 catalysts, manganese seems to be mainly Mn(III) and, as a consequence, the amount of oxygen vacancies increases gradually with the copper content and (iii) the presence of copper into the perovskite structure enhances the reducibility of the catalyst and increases the mobility of lattice oxygen. BaMn0.7Cu0.3O3 is the most active catalyst for NO2 generation and, consequently, shows the lowest T50% value, the highest CO2 selectivity, the best performance during TPR cyclic experiments, and the highest soot oxidation rate at 450 °C. This behavior is a result of the enhancement of the redox properties of the catalyst due to the replacement of Mn(III)/Mn(IV) by Cu(II) in the perovskite structure.
机译：BaMn 1？ x 2 辅助柴油机烟灰去除活性> Cu x O 3 （ x < / em> = 0、0.1、0.2、0.3）钙钛矿型催化剂已通过程序升温反应（TPR）和450°C等温实验进行了测试。 ICP-OES，N 2 吸附，XRD，XPS，IR光谱和H 2 1？ x Cu x O 3 催化剂中，锰似乎主要是Mn（ III ），因此，氧空位的数量随铜含量的增加而逐渐增加，并且（iii）钙钛矿结构中铜的存在增强了催化剂的还原性并增加晶格氧的迁移率。 BaMn 0.7 Cu 0.3 O 3 是NO 2 生成的活性最高的催化剂，因此显示出最低的 T 50％ 值，最高的CO 2 选择性，TPR循环实验期间的最佳性能以及在450°C时最高的烟灰氧化速率。这种行为是由于用Cu（ II>代替了Mn（ III ）/ Mn（ IV ）导致催化剂氧化还原性能增强的结果）。

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