Effect of Potassium Nitrate Modification on the Performance of Copper‐Manganese Oxide Catalyst for Enhanced Soot Combustion,ChemCatChem

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Effect of Potassium Nitrate Modification on the Performance of Copper‐Manganese Oxide Catalyst for Enhanced Soot Combustion
ChemCatChem ( IF 3.8 ) Pub Date : 2018-02-16 , DOI: 10.1002/cctc.201701735
Han Zhao _{1,

2} , Xiaoxia Zhou ₁ , Weimin Huang ₁ , Linyu Pan _{1,

2} , Min Wang _{1,

2} , Qinru Li ₁ , Jianlin Shi _{1,

3} , Hangrong Chen _{1,

3}

Affiliation

An enhanced catalytic activity and improved reusability were achieved by applying facile KNO₃ modification during the synthesis of a copper‐manganese mixed oxide (CuMnO). Upon KNO₃ modification, the characteristic finishing temperature (T_f) of catalytic soot combustion was decreased from 360 °C for CuMnO to 338 °C for the K‐modified product CuMnO(K). Moreover, this T_f value for CuMnO(K) remained remarkably low (346 °C) even after five runs of an activity test. The excellent performance of CuMnO(K) is attributed to its well‐dispersed nanoparticle morphology, which is totally different from the microspherical features of CuMnO and is beneficial for its sufficient contact with the soot particles. Additionally, an interesting phase evolution of CuMnO(K) was observed for the first time from Cu_1.5Mn_1.5O₄ to the mixed phases of CuO, K₂Mn₄O₈, and MnO_x during the consecutive test runs. These mixed phases are believed to be responsible for the enhancement and stabilization of the catalytic activity. Furthermore, the mechanism for the morphology transformation upon KNO₃ modification and for the phase evolution during soot combustion was investigated.

中文翻译：

硝酸钾改性对铜锰氧化物增强烟灰燃烧性能的影响

通过在铜锰混合氧化物（CuMnO）的合成过程中应用容易的KNO ₃改性，可以提高催化活性和可重复使用性。经过KNO ₃改性后，催化烟ot燃烧的特征终点温度（T _f）从CuMnO的360°C降低到K改性产物CuMnO（K）的338°C。而且，这个T _f即使经过五次活性测试，CuMnO（K）的值仍显着较低（346°C）。CuMnO（K）的优异性能归因于其良好分散的纳米颗粒形态，这与CuMnO的微球形特征完全不同，并且有利于与烟灰颗粒充分接触。此外，首次观察到CuMnO（K）从Cu _1.5 Mn _1.5 O ₄到CuO，K ₂ Mn ₄ O ₈和MnO _x混合相的有趣的相变。在连续的测试运行中。据信这些混合相负责催化活性的增强和稳定。此外，研究了在KNO ₃改性后的形态转变和烟combustion燃烧过程中相演变的机理。

更新日期：2018-02-16

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