Role of framework on NH4NO3 occlusion in zeolite pores

Man Park, Seung Chan Shin, Choong Lyeal Choi, Dong Hoon Lee, Woo Taik Lim, Sridhar Komarneni, Myung Chul Kim, Jyung Choi, Nam Ho Heo

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Salt occlusion in zeolites is a unique phenomenon and plays an important role in solid and molten state reactions. To elucidate its mechanism, the NH4NO3 occlusion was studied with various zeolites that exhibit diversity in pore shape (channel and cavity), window size, and composition and charge of framework. We also attempted to classify NH4NO3 introduced into zeolite pores by characterizing their properties such as stability against washing with water, thermal behavior, and spectroscopic characteristics. Based on the geometric consideration between zeolite pores and salts, the salts introduced into zeolite pores could be classified as 'dispersed', 'occluded', and 'trapped' salts. This classification was based on their stability against washing with water. Occluded NH4NO3 salts were present in the pores of zeolites such as AlPO4-18, Na-Pl and 4A, while dispersed ones were observed in those of zeolites such as ZSM-5 and 13X. Framework charge was not essential in salt occlusion, although it affected the occluded amount and stability of occluded NH4NO3. It is clear from these results that the requirement for salt occlusion is the proper size fit between the window size of zeolite pore and the size of each ion pair of salt. Occluded salts were stabilized through geometric fit and/or electrostatic interactions with negatively charged frameworks that led to increase in their stabilities against washing with water and thermal treatment. Therefore, the geometric relationship of zeolite pore to salt plays more crucial role in salt occlusion than framework charge.

Original languageEnglish (US)
Pages (from-to)91-99
Number of pages9
JournalMicroporous and Mesoporous Materials
Volume50
Issue number1
DOIs
StatePublished - Dec 15 2001

Fingerprint

Zeolites
occlusion
Salts
salts
porosity
zeolites
washing
Washing
water treatment
Water
Coulomb interactions
Water treatment
water
Molten materials
Heat treatment

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials

Cite this

Park, M., Chan Shin, S., Lyeal Choi, C., Hoon Lee, D., Taik Lim, W., Komarneni, S., ... Heo, N. H. (2001). Role of framework on NH4NO3 occlusion in zeolite pores. Microporous and Mesoporous Materials, 50(1), 91-99. https://doi.org/10.1016/S1387-1811(01)00439-5
Park, Man ; Chan Shin, Seung ; Lyeal Choi, Choong ; Hoon Lee, Dong ; Taik Lim, Woo ; Komarneni, Sridhar ; Chul Kim, Myung ; Choi, Jyung ; Heo, Nam Ho. / Role of framework on NH4NO3 occlusion in zeolite pores. In: Microporous and Mesoporous Materials. 2001 ; Vol. 50, No. 1. pp. 91-99.
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Park, M, Chan Shin, S, Lyeal Choi, C, Hoon Lee, D, Taik Lim, W, Komarneni, S, Chul Kim, M, Choi, J & Heo, NH 2001, 'Role of framework on NH4NO3 occlusion in zeolite pores', Microporous and Mesoporous Materials, vol. 50, no. 1, pp. 91-99. https://doi.org/10.1016/S1387-1811(01)00439-5

Role of framework on NH4NO3 occlusion in zeolite pores. / Park, Man; Chan Shin, Seung; Lyeal Choi, Choong; Hoon Lee, Dong; Taik Lim, Woo; Komarneni, Sridhar; Chul Kim, Myung; Choi, Jyung; Heo, Nam Ho.

In: Microporous and Mesoporous Materials, Vol. 50, No. 1, 15.12.2001, p. 91-99.

Research output: Contribution to journalArticle

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T1 - Role of framework on NH4NO3 occlusion in zeolite pores

AU - Park, Man

AU - Chan Shin, Seung

AU - Lyeal Choi, Choong

AU - Hoon Lee, Dong

AU - Taik Lim, Woo

AU - Komarneni, Sridhar

AU - Chul Kim, Myung

AU - Choi, Jyung

AU - Heo, Nam Ho

PY - 2001/12/15

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N2 - Salt occlusion in zeolites is a unique phenomenon and plays an important role in solid and molten state reactions. To elucidate its mechanism, the NH4NO3 occlusion was studied with various zeolites that exhibit diversity in pore shape (channel and cavity), window size, and composition and charge of framework. We also attempted to classify NH4NO3 introduced into zeolite pores by characterizing their properties such as stability against washing with water, thermal behavior, and spectroscopic characteristics. Based on the geometric consideration between zeolite pores and salts, the salts introduced into zeolite pores could be classified as 'dispersed', 'occluded', and 'trapped' salts. This classification was based on their stability against washing with water. Occluded NH4NO3 salts were present in the pores of zeolites such as AlPO4-18, Na-Pl and 4A, while dispersed ones were observed in those of zeolites such as ZSM-5 and 13X. Framework charge was not essential in salt occlusion, although it affected the occluded amount and stability of occluded NH4NO3. It is clear from these results that the requirement for salt occlusion is the proper size fit between the window size of zeolite pore and the size of each ion pair of salt. Occluded salts were stabilized through geometric fit and/or electrostatic interactions with negatively charged frameworks that led to increase in their stabilities against washing with water and thermal treatment. Therefore, the geometric relationship of zeolite pore to salt plays more crucial role in salt occlusion than framework charge.

AB - Salt occlusion in zeolites is a unique phenomenon and plays an important role in solid and molten state reactions. To elucidate its mechanism, the NH4NO3 occlusion was studied with various zeolites that exhibit diversity in pore shape (channel and cavity), window size, and composition and charge of framework. We also attempted to classify NH4NO3 introduced into zeolite pores by characterizing their properties such as stability against washing with water, thermal behavior, and spectroscopic characteristics. Based on the geometric consideration between zeolite pores and salts, the salts introduced into zeolite pores could be classified as 'dispersed', 'occluded', and 'trapped' salts. This classification was based on their stability against washing with water. Occluded NH4NO3 salts were present in the pores of zeolites such as AlPO4-18, Na-Pl and 4A, while dispersed ones were observed in those of zeolites such as ZSM-5 and 13X. Framework charge was not essential in salt occlusion, although it affected the occluded amount and stability of occluded NH4NO3. It is clear from these results that the requirement for salt occlusion is the proper size fit between the window size of zeolite pore and the size of each ion pair of salt. Occluded salts were stabilized through geometric fit and/or electrostatic interactions with negatively charged frameworks that led to increase in their stabilities against washing with water and thermal treatment. Therefore, the geometric relationship of zeolite pore to salt plays more crucial role in salt occlusion than framework charge.

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