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Mechanism of Pd and K co-doping to enhance the simultaneous removal of NOx and soot over LaMnO3
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2020-08-05 , DOI: 10.1039/d0cy00064g Li Yang 1, 2, 3, 4 , Jingnan Hu 1, 2, 3, 4 , Chen Zhang 1, 2, 3, 4 , Qiang Song 4, 5, 6, 7 , Zhigang Xue 1, 2, 3, 4 , Xinmin Zhang 1, 2, 3, 4 , Li Tong 4, 8, 9, 10
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2020-08-05 , DOI: 10.1039/d0cy00064g Li Yang 1, 2, 3, 4 , Jingnan Hu 1, 2, 3, 4 , Chen Zhang 1, 2, 3, 4 , Qiang Song 4, 5, 6, 7 , Zhigang Xue 1, 2, 3, 4 , Xinmin Zhang 1, 2, 3, 4 , Li Tong 4, 8, 9, 10
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A series of La0.5K0.5Mn1−yPdyO3 catalysts with different doping amounts of Pd (y = 0, 0.01, 0.02, 0.03, 0.04) were synthesized by the citric acid complexation method and tested for the simultaneous removal of NOx and soot. The X-ray diffraction (XRD), specific surface area and scanning electron microscopy (SEM) results reveal the microscopic morphology and structure of the catalysts, and the catalytic performance of the materials was investigated by temperature-programmed experiments. The noble metal Pd was uniformly dispersed on the surface of the materials, as shown in the SEM images. Among all the catalysts, La0.5K0.5Mn0.97Pd0.03O3 exhibited the best NOx removal rate and the lowest soot ignition temperature. The mechanism of Pd in the simultaneous removal of NOx and soot was characterized by XPS, HRTEM and H2-TPR (the redox properties), and the results illustrate that Pd2+ substitution for Mn3+ and generation of oxygen vacancies are the key factors in promoting soot combustion. Based upon the NOx-storage test and kinetic calculation, the excellent catalytic performance of a small amount of palladium (0.03 atomic ratio) was confirmed, and this system exhibited the high simultaneous removal rate of NOx and soot under lean conditions.
中文翻译：
Pd和K共掺杂增强LaMnO3同时清除NOx和烟灰的机理
通过柠檬酸络合法合成了一系列具有不同Pd掺杂量（y = 0、0.01、0.02、0.03、0.04）的La 0.5 K 0.5 Mn 1- y Pd y O 3催化剂，并测试了同时去除Pd的方法。 NO x和烟灰。X射线衍射（XRD），比表面积和扫描电子显微镜（SEM）结果揭示了催化剂的微观形貌和结构，并通过程序升温实验研究了其催化性能。如SEM图像所示，贵金属Pd均匀地分散在材料的表面上。在所有催化剂中，La 0.5 K0.5锰0.97的Pd 0.03 ø 3表现出最佳NO X除去率与最低烟灰着火温度。Pd的同时除去NO的机制X和烟灰的特点是XPS，HRTEM和H 2 -TPR（氧化还原特性），其结果示出的Pd 2+取代的Mn 3+和产生氧空位是促进烟尘燃烧的关键因素。基于所述NO X吸藏测试和动力学计算，钯少量的优异的催化性能（0.03原子比）的确认，以及该系统表现出NO的高同时除去率稀薄条件下的X和烟灰。
更新日期：2020-09-05
中文翻译：
Pd和K共掺杂增强LaMnO3同时清除NOx和烟灰的机理
通过柠檬酸络合法合成了一系列具有不同Pd掺杂量（y = 0、0.01、0.02、0.03、0.04）的La 0.5 K 0.5 Mn 1- y Pd y O 3催化剂，并测试了同时去除Pd的方法。 NO x和烟灰。X射线衍射（XRD），比表面积和扫描电子显微镜（SEM）结果揭示了催化剂的微观形貌和结构，并通过程序升温实验研究了其催化性能。如SEM图像所示，贵金属Pd均匀地分散在材料的表面上。在所有催化剂中，La 0.5 K0.5锰0.97的Pd 0.03 ø 3表现出最佳NO X除去率与最低烟灰着火温度。Pd的同时除去NO的机制X和烟灰的特点是XPS，HRTEM和H 2 -TPR（氧化还原特性），其结果示出的Pd 2+取代的Mn 3+和产生氧空位是促进烟尘燃烧的关键因素。基于所述NO X吸藏测试和动力学计算，钯少量的优异的催化性能（0.03原子比）的确认，以及该系统表现出NO的高同时除去率稀薄条件下的X和烟灰。
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