New insight into N2O formation from NH3 oxidation over MnO /TiO2 catalyst

Mn-based catalysts supported on γ-Al2O3, TiO2 and MCM-41: a comparison for low-temperature NO oxidation with low ratio of O3/NO

“…The main reason for the difference of BET specific surface areas was probably attributed to the different supports, which was of vital importance for catalyst physical properties. 49 Combined with catalytic oxidation results that Mn/γ-Al 2 O 3 exhibited the highest NO oxidation efficiency, it could be indicated that the surface area was not the major factor in NO oxidation.…”

“…The peak at 641.8-641.9 eV corresponded to Mn 3+ , 11,27 whereas the signal at 643.2 eV and 646.0 eV could be assigned to Mn 4+ . 49,55,56 3 that the ratio of Mn 3+ /Mn in Mn/TiO 2 was the highest, followed by Mn/ g-Al 2 O 3 , while for Mn-MCM-41, there was no Mn 3+ and the ratio of Mn 4+ /Mn was the highest. This was consistent with the result of H 2 -TPR.…”

“…It could be found that Mn/MCM-41 displayed the highest BET surface area among the three catalysts, around three times as high as that of Mn/g-Al 2 O 3 and ve times that of Mn/TiO 2 . The main reason for the difference of BET specic surface areas was probably attributed to the different supports, which was of vital importance for catalyst physical properties 49. Combined with catalytic oxidation results that Mn/g-Al 2 O 3 exhibited the highest NO oxidation efficiency, it could be indicated that the surface area was not the major factor in NO oxidation.The XRD patterns of the three catalyst samples were shown in Fig.3.…”

Comparison of Selective Catalytic Reduction Performance of Mn–Co Bi‐Metal Oxides Prepared by Different Methods

“…Therefore, the development of efficient and stable low temperature NH 3 ‐SCR catalyst has become the focus of SCR technology research. Transition metal oxides, especially MnO x , have shown excellent NH 3 ‐SCR activity at low temperatures due to manganese valence changes and oxygen vacancy . However, the catalytic activity of MnO x ‐based catalysts mainly depends on its specific surface area, Mn oxidation state, MnO x dispersion, surface active oxygen, surface acidity, etc .…”

Progress in selective catalytic oxidation of ammonia to nitrogen

“…也有研究发现, 我国排放氨气 浓度的增加削弱了二氧化硫和氮氧化物的控制对细颗 粒物中硝酸盐减少的效益 [4] . 2018年1月1日 [25,26] 、Ru [27~29] 、Ir [30] 、Au [31] 、Ag 、Co [42,43] 、Mn [44,45] 、V [46,47] [48,49] 、MCM-41型 [50] 、SSZ-13型 [51~53] 和 SAPO-34型 [52,54] 材料上. [62] , 并且分子筛载体具有大的比 表面积和良好的离子交换性质, 允许以高分散形式引 入活性成分 [63,64] , 得到了研究者的广泛研究.…”