Influence Mechanism of NH4F Etching on the Structure and Acidity of ZSM-5 Zeolite

doi:10.11938/cjmr20263207

Abstract

Abstract:

Ammonium fluoride (NH₄F) etching is an effective method for constructing hierarchical zeolites, yet its precise impact on the detailed structure and acidity remains unclear. This study employs probe molecule-assisted solid-state NMR technique to systematically investigate the evolution of acid site structures and properties during NH₄F etching of ZSM-5 zeolites. The results reveal that the degree of NH₄F etching significantly manipulates the amount, strength, type, and spatial accessibility of acid sites, and it is also directly associated with the development of hierarchical pore structures. This work elucidates the influence mechanism of NH₄F etching on zeolite structure and acidic property at the atomic level, providing a theoretical foundation for the rational design and optimization of efficient hierarchical zeolites.

Key words: solid-state NMR, acidic property, probe molecule, NH₄F etching, hierarchical zeolites

CLC Number:

O482.53

WANG Jing, XIAO Yao, YU Xin, YI Xianfeng, ZHENG Anmin. Influence Mechanism of NH₄F Etching on the Structure and Acidity of ZSM-5 Zeolite[J]. Chinese Journal of Magnetic Resonance, 2026, 43(2): 136-145.

Figures/Tables 7

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References 28

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Sample	S_BET^a /m²g^-1	S_micro^a /m²g^-1	V_pore^a /cm³g^-1	V_micro^a /cm³g^-1	V_meso^a /cm³g^-1	Crystallinity^b /%	Si/Al^c
Z5-parent	431	406	0.21	0.17	0.04	100	29.8
Z5-10%F	424	405	0.21	0.17	0.04	91	31.9
Z5-20%F	407	386	0.26	0.16	0.10	86	32.6
Z5-40%F	407	363	0.30	0.15	0.15	80	34.0

Influence Mechanism of NH₄F Etching on the Structure and Acidity of ZSM-5 Zeolite

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