MnO x -ZSM-5脱硝催化剂制备的溶剂效应研究

doi:10.19964/j.issn.1006-4990.2021-0702

Abstract

Abstract:

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

CLC Number:

TQ137.1

ZHOU Wei,ZHANG Gengrui,YU Haibin,MA Xinbin,LIU Fei,LIU Jiaxu. Study on solvent effect on preparation of MnO _x -ZSM-5 deNO _x catalysts[J]. Inorganic Chemicals Industry, 2022, 54(8): 138-144.

Figures/Tables 10

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编号	S_BET/（m²·g^-1）	孔容/（cm³·g^-1）
ZSM-5	300	0.182
a	298	0.078
b	298	0.072
c	300	0.071
d	301	0.066
e	295	0.076
f	293	0.067

样品编号	w（Mn²⁺）/ %	w（Mn³⁺）/ %	w（Mn⁴⁺）/ %	w（Mn³⁺+ Mn⁴⁺）/%
a	23.7	30.5	45.8	76.3
b	22.0	44.1	33.9	78.0
c	32.2	35.8	31.9	67.8
d	32.9	33.6	33.5	67.1
e	34.2	33.7	32.1	65.8
f	36.9	27.8	35.3	63.1

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Study on solvent effect on preparation of MnO _x -ZSM-5 deNO _x catalysts

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Study on solvent effect on preparation of MnO x -ZSM-5 deNO x catalysts