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Study on solvent effect on preparation of MnO x -ZSM-5 deNO x catalysts
Received date: 2021-11-19
Online published: 2022-08-11
MnO x -ZSM-5 deNO x catalyst has good low?temperature NH3-SCR activity.It has become a research hotspot because of the low raw material cost and high deNO x efficiency.A series of MnO x -ZSM-5 catalysts prepared by adjusting the composition of solvents（ethanol，water or their mixed solutions） with steam dry solvent method was described in detail.The reason of influence of“solvent effect” on the deNO x performance of catalysts was studied for the first time.X-ray diffraction（XRD），X-ray photoelectron spectroscopy（XPS），temperature programmed ammonia adsorption（NH3-TPD），N2 physical adsorption，hydrogen temperature programmed reduction（H2-TPR） and scanning electron microscopy（SEM） were used to analyze the relationship between the physical and chemical properties of the catalyst，the existing state of manganese and the catalytic performance.The results showed that the specific surface area of MnO x -ZSM-5 deNO x catalyst decreased，and the proportion of Mn4+ species with high catalytic activity decreased rapidly with increasing the proportion of water in the solvent，resulting in the gradual decrease of the deNO x activity of the catalyst，which indicated that the solvent composition affected the deNO x performance of the catalyst.Therefore，it was very important to select an appropriate solvent in the preparation of MnO x -ZSM-5 deNO x catalyst，which provided important information on how to prepare high activity MnO x -ZSM-5 deNO x catalyst.
Key words： MnO x -ZSM-5; deNO x catalyst; NH3-SCR; dry solvent method; solvent effects
Wei ZHOU , Gengrui ZHANG , Haibin YU , Xinbin MA , Fei LIU , Jiaxu LIU . Study on solvent effect on preparation of MnO x -ZSM-5 deNO x catalysts[J]. Inorganic Chemicals Industry, 2022 , 54(8) : 138 -144 . DOI: 10.19964/j.issn.1006-4990.2021-0702
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