Abstract A Pd/K/MgAlO mixed oxide was obtained by coprecipitation. The effect of Pd, K co-doping on the structure and catalytic activity of the Mg–Al hydrotalcite in a high concentration of SO2 atmosphere was characterized by X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy (XPS), Temperature-programmed reduction (H2-TPR), and the transient response method. Studied the reaction mechanism and action mechanism of the doped K and Pd with the polluted gas in the catalytic, and calculated the kinetic parameters of the catalytic reaction. Our results show that potassium was highly dispersed on the surface of Mg–Al hydrotalcite and that incorporating potassium into the catalyst resulted in smaller grains than those of the original catalyst. After potassium doping K, K+ cations substituted protons of the weakly basic OH on MgAlO to form Mg(Al)-O-K., and the formation of this new basic valence bond conducive to the combustion of diesel soot. The ignition temperature of soot decreased from 380 to 217 °C. Moreover, modification of this Mg–Al hydrotalcite catalyst with potassium and palladium significantly reduces the activation energy of the reaction which form CO2 and N2 and benefit the combustion of soot and removal of NOx.

中文翻译：

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Mg-Al水滑石Pd、K共掺杂同时去除含SO2气氛中柴油烟尘和NOx的机理

摘要 采用共沉淀法制备了Pd/K/MgAlO混合氧化物。通过 X 射线衍射、扫描电子显微镜、傅里叶变换红外光谱、X 射线光电子能谱表征 Pd、K 共掺杂对高浓度 SO2 气氛中 Mg-Al 水滑石的结构和催化活性的影响(XPS)、程序升温还原 (H2-TPR) 和瞬态响应方法。研究了掺杂K、Pd与催化中污染气体的反应机理和作用机理，计算了催化反应的动力学参数。我们的结果表明，钾高度分散在 Mg-Al 水滑石的表面，并且将钾加入催化剂导致比原始催化剂更小的颗粒。钾掺杂 K 后，K+ 阳离子取代了 MgAlO 上弱碱性 OH 的质子形成 Mg(Al)-OK.，而这种新的碱性价键的形成有利于柴油机烟尘的燃烧。烟尘的着火温度从 380 ℃降低到 217 ℃。此外，用钾和钯对这种 Mg-Al 水滑石催化剂进行改性，显着降低了形成 CO2 和 N2 的反应活化能，有利于烟尘的燃烧和 NOx 的去除。