The soot removal process in presence of a series of LNT-catalysts, and different reaction atmospheres, has been studied, using thermogravimetric analysis coupled to mass spectrometry (TG-MS) time-resolved experiments. Kinetic parameters have been estimated, using a distribution function of activation energy: where the frequency factor was correlated approximately with the activation energies which enable the decoupling of the processes involved in the regeneration by soot removal over those synthesized catalysts. It was found that soot removal is a sequential process that is strongly dependent on the formulation and surface structure of the catalyst and atmosphere of reaction. K-containing LNT catalysts showed a high activity in the soot removal process by gasification (Ea≈70–90kJmol⁻¹), promoted by surface hydroxylated centers, decreasing the ignition temperature in oxygen atmosphere. NO+O₂ atmosphere, more oxidizing than O₂, provokes in addition a reduction in the soot removal temperature due to a direct reaction between soot and NO₂ (gas) and/or the adsorbed NO_x onto the catalyst surface.

中文翻译：

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LNT催化剂中烟尘去除的本征反应性分析

使用热重分析与质谱法（TG-MS）进行时间分辨实验，研究了在一系列LNT催化剂和不同反应气氛下的烟灰去除过程。使用活化能的分布函数估算了动力学参数：其中频率因子与活化能大致相关，该活化能通过与那些合成的催化剂去除烟so而使参与再生的过程脱钩。已经发现，烟灰的去除是一个顺序过程，该过程很大程度上取决于催化剂的配方和表面结构以及反应气氛。含钾的LNT催化剂在通过气化去除烟灰过程中表现出很高的活性（Ea≈70–90kJmol ^-1），由表面羟基化中心促进，降低了氧气气氛中的着火温度。由于烟灰和NO ₂（气体）和/或吸附的NO _x在催化剂表面上的直接反应，NO + O ₂气氛比O ₂更具氧化性，另外还导致烟灰去除温度降低。