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首页> 外文期刊>RSC Advances >Facile synthesis of spinel Cu1.5Mn1.5O4 microspheres with high activity for the catalytic combustion of diesel soot
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Facile synthesis of spinel Cu1.5Mn1.5O4 microspheres with high activity for the catalytic combustion of diesel soot

机译：高效合成尖晶石Cu 1.5 Mn 1.5 O 4 微球催化柴油烟combustion的高活性

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A series of Cu–Mn mixed oxides were prepared via a facile co-precipitation method and used as catalysts for diesel soot combustion in NOx/O2/N2. It is found that the chemical composition in the Cu–Mn mixed oxides has a significant influence on both morphology and catalytic activity. When the Cu/Mn atomic ratio was optimized to be 1, a distinctive pure spinel phase of Cu1.5Mn1.5O4 was obtained (named Cu1Mn1), which exhibited superior catalytic activity (e.g., finishing combustion temperature (Tf) = 360 °C, in loose contact mode). The excellent catalytic activity of Cu1Mn1 was mainly attributed to the following aspects: (1) distinct morphological features: the well-dispersed Cu1Mn1 microspheres with a rough surface could contact soot particles sufficiently, and the stacked pores between the loosely packed nanoparticles within the microspheres could facilitate the diffusion of gaseous O2, NO and NO2; and (2) the high intrinsic activity of the Cu1.5Mn1.5O4 phase: the abundant adsorbed oxygen species (Oads) is beneficial to the direct oxidation of soot into CO2, and the enormous Cu+–Mnλ+ (λ = 3, 4, hereinafter inclusive) cation pairs could facilitate the production of the strong oxidant NO2, and the interaction between Cu2+ and NO2 would lead to high enhancement efficiency of NO2 for soot combustion. This facile strategy for the high activity spinel phase towards catalytic soot combustion shows great promise for practical applications.
机译：通过一种简便的共沉淀方法 制备了一系列Cu-Mn混合氧化物，并用作NO x 中柴油烟灰燃烧的催化剂。 sub> / O 2 / N 2 。发现铜锰混合氧化物中的化学成分对形态和催化活性都有重要影响。当Cu / Mn原子比优化为1时，Cu 1.5 Mn 1.5 O 4 （命名为Cu1Mn1），其表现出优异的催化活性（ eg ，最终燃烧温度（ T f ）= 360°C，在松动接触模式下）。 Cu1Mn1的优异催化活性主要归因于以下几个方面：（1）明显的形态特征：表面粗糙的Cu1Mn1微球分散均匀，可以充分接触烟灰颗粒，而在微球内松散堆积的纳米颗粒之间的堆积孔可以促进气态O 2 ，NO和NO 2 的扩散; （2）Cu 1.5 Mn 1.5 O 4的高固有活性 相：大量吸附的氧（O ads ）有利于烟灰直接氧化成CO 2 ，以及巨大的Cu + –Mn λ + < / small>（λ = 3，4，以下，包括端点）阳离子对可促进强氧化剂NO 2 的产生以及相互作用Cu 2 + 和NO 2 之间的转换将导致NO 2的增强效率高 用于烟灰燃烧。高活性尖晶石相催化烟so燃烧的这种简便策略在实际应用中显示出巨大的希望。

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