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首页> 外文期刊>Applied Catalysis, A. General: An International Journal Devoted to Catalytic Science and Its Applications >NiMn mixed oxides with enhanced low-temperature deNO(x) performance: Insight into the coordinated decoration of MnOx by NiO phase via glycine combustion method
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NiMn mixed oxides with enhanced low-temperature deNO(x) performance: Insight into the coordinated decoration of MnOx by NiO phase via glycine combustion method

机译：NIMN混合氧化物具有增强的低温丹诺（X）性能：通过甘氨酸燃烧方法对NiO相的CNOX协调装饰洞察

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摘要

Herein, a facile glycine combustion method was utilized to prepare a series of Ni and Mn based single/double metal oxides, which were evaluated as catalysts for low temperature selective catalytic reduction of NO with NH3. The NiMn-T samples presented superior catalytic performance especially for NiMn-400, with similar to 100 % NOx conversion, >85 % N-2 selectivity within 90-300 degrees C, and better SO2 resistance. The superior catalytic activity might be related to the coordination of Ni and Mn, which afforded higher Mn4+/Mnn+ ratio, larger S-BET, more suitable acid site amounts and redox capacity. The improved SO2 resistance of NiMn-400 catalyst can be ascribed to the less ammonium (bi)sulfate deposition and metal sulfation. In-situ DRIFTS revealed that the Ni doping could deliver more reactive species (NH2, monodentate nitrite, bidentate nitrate), and the surface acidity is less affected by SO2, which can account for the enhanced low temperature activity and SO2 resistance of the NiMn-400 catalyst.
机译：本文采用一种简便的甘氨酸燃烧方法制备了一系列镍基和锰基单/双金属氧化物，并对其作为低温选择性催化还原NO的催化剂进行了评价。NiMn-T样品表现出优越的催化性能，尤其是对于NiMn-400，具有类似于100%的NOx转化率，在90-300℃范围内的N-2选择性>85%，以及更好的抗SO2性能。其优越的催化活性可能与Ni和Mn的配位有关，它们提供了更高的Mn4+/Mnn+比、更大的S-BET、更合适的酸中心量和氧化还原容量。NiMn-400催化剂抗SO2性能的提高可归因于硫酸铵（bi）沉积和金属硫酸化的减少。原位漂移显示，镍掺杂可以提供更多的活性物种（NH2、单齿亚硝酸盐、双齿硝酸盐），并且表面酸性受SO2的影响较小，这可以解释NiMn-400催化剂增强的低温活性和抗SO2性。

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