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Study on NH3-SCR performance of manganese based catalysts doped with different elements
Received date: 2022-11-01
Online published: 2023-07-13
In order to study the influence of the acid-base and redox capacity of the catalyst on the NH3-SCR performance of pure manganese oxide catalyst，the alkaline earth metals of Sr，transition metals of Ce，Fe and nonmetal of Si were selected to modify the pure manganese oxide catalyst.All catalysts were prepared by coprecipitation method.The catalysts were characterized by XRD，N2-BET，NH3-TPD，XPS and H2-TPR.The XRD results showed that the main phases of the manganese-based catalyst prepared by the method used in this experiment were Mn2O3 and Mn5O8.The N2-BET results showed that Ce、Fe、Si could effectively increase the specific surface area of pure manganese oxides.The NH3-TPD and XPS showed that the introduction of Ce、Fe、Si increased the content of oxygen（OⅡ） and Mn4+ on the surface of pure manganese oxides，the doping of Ce and Si increased the total acid content of the catalyst，and Fe effectively regulated the distribution of acid sites.The H2-TPR showed that all the elements except Ce weakened the redox capacity of pure manganese oxide catalyst.The denitrification activity of all catalysts was tested at 100~400 ℃.MnCeO x showed excellent denitrification activity at low temperature and MnSiO x showed good denitrification activity at medium and high temperature.
TAN Renjun , LUO Shizhong , WANG Tao , DU Peining , JING Fangli . Study on NH3-SCR performance of manganese based catalysts doped with different elements[J]. Inorganic Chemicals Industry, 2023 , 55(7) : 115 -121 . DOI: 10.19964/j.issn.1006-4990.2022-0640
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