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Title: Interactions of SO2-Containing Acid Gases with ZIF-8: Structural Changes and Mechanistic Investigations

Abstract

Zeolitic imidazolate frameworks (ZIFs) are a set of nanoporous metal–organic frameworks (MOFs) with tunable porosity and functionality. Among MOFs, they also show relatively good stability with respect to temperature and humidity. These characteristics lead to their possible applications in separation processes. In many practical separation processes, adsorbents are exposed to a variety of molecular species including acid gases. However, there is little knowledge of the effects of such acid gas exposure on the adsorption and separation properties of ZIFs. Here, the stability of a model ZIF material (ZIF-8) under SO2 exposure in dry, humid, and aqueous environments has been investigated in detail. Combined characterization by several techniques (PXRD, N2 physisorption, EDX, XPS, and FTIR) allowed us to track the structural and compositional properties of ZIF-8 before and after SO2 exposure. We found ZIF-8 is stable after prolonged exposure in dry SO2 and in humid air without SO2. However, exposure to 10–20 ppm concentrations of SO2 in the presence of high relative humidity led to its irreversible structural degradation over time as evidenced by substantial losses in crystallinity and textural properties. Exposure to similar concentrations of aqueous SO2 did not lead to bulk degradation. Humid SO2 exposed ZIF-8 showed a significantmore » presence of sulfur (S) even after reactivation, with vibrational characteristics corresponding to (bi)sulfite and (bi)sulfate groups. A mechanism of ZIF-8 degradation combining the synergistic effects of SO2 and humidity is proposed. Attack by sulfuric and sulfurous acid species (generated in humid SO2) leads to protonation of nitrogen in the imidazole ring, resulting in cleavage of metal–linker (Zn–N) bonds. Our detailed experimental findings serve as a starting point for developing a generalized mechanism of acid gas interactions with ZIF materials.« less

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. Georgia Inst. of Technology, Atlanta, GA (United States)
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Center for Understanding and Control of Acid Gas-Induced Evolution of Materials for Energy (UNCAGE-ME); Georgia Institute of Technology, Atlanta, GA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1388782
Grant/Contract Number:  
SC0012577
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Physical Chemistry. C
Additional Journal Information:
Journal Volume: 120; Journal Issue: 48; Related Information: UNCAGE-ME partners with Georgia Institute of Technology (lead); Lehigh University; Oak Ridge National Laboratory; University of Alabama; University of Florida; University of Wisconsin; Washington University in St. Louis; Journal ID: ISSN 1932-7447
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; catalysis (heterogeneous); defects; membrane; carbon capture; materials and chemistry by design; synthesis (novel materials); synthesis (self-assembly); synthesis (scalable processing)

Citation Formats

Bhattacharyya, Souryadeep, Pang, Simon H., Dutzer, Michael R., Lively, Ryan P., Walton, Krista S., Sholl, David S., and Nair, Sankar. Interactions of SO2-Containing Acid Gases with ZIF-8: Structural Changes and Mechanistic Investigations. United States: N. p., 2016. Web. doi:10.1021/acs.jpcc.6b09197.
Bhattacharyya, Souryadeep, Pang, Simon H., Dutzer, Michael R., Lively, Ryan P., Walton, Krista S., Sholl, David S., & Nair, Sankar. Interactions of SO2-Containing Acid Gases with ZIF-8: Structural Changes and Mechanistic Investigations. United States. https://doi.org/10.1021/acs.jpcc.6b09197
Bhattacharyya, Souryadeep, Pang, Simon H., Dutzer, Michael R., Lively, Ryan P., Walton, Krista S., Sholl, David S., and Nair, Sankar. Wed . "Interactions of SO2-Containing Acid Gases with ZIF-8: Structural Changes and Mechanistic Investigations". United States. https://doi.org/10.1021/acs.jpcc.6b09197. https://www.osti.gov/servlets/purl/1388782.
@article{osti_1388782,
title = {Interactions of SO2-Containing Acid Gases with ZIF-8: Structural Changes and Mechanistic Investigations},
author = {Bhattacharyya, Souryadeep and Pang, Simon H. and Dutzer, Michael R. and Lively, Ryan P. and Walton, Krista S. and Sholl, David S. and Nair, Sankar},
abstractNote = {Zeolitic imidazolate frameworks (ZIFs) are a set of nanoporous metal–organic frameworks (MOFs) with tunable porosity and functionality. Among MOFs, they also show relatively good stability with respect to temperature and humidity. These characteristics lead to their possible applications in separation processes. In many practical separation processes, adsorbents are exposed to a variety of molecular species including acid gases. However, there is little knowledge of the effects of such acid gas exposure on the adsorption and separation properties of ZIFs. Here, the stability of a model ZIF material (ZIF-8) under SO2 exposure in dry, humid, and aqueous environments has been investigated in detail. Combined characterization by several techniques (PXRD, N2 physisorption, EDX, XPS, and FTIR) allowed us to track the structural and compositional properties of ZIF-8 before and after SO2 exposure. We found ZIF-8 is stable after prolonged exposure in dry SO2 and in humid air without SO2. However, exposure to 10–20 ppm concentrations of SO2 in the presence of high relative humidity led to its irreversible structural degradation over time as evidenced by substantial losses in crystallinity and textural properties. Exposure to similar concentrations of aqueous SO2 did not lead to bulk degradation. Humid SO2 exposed ZIF-8 showed a significant presence of sulfur (S) even after reactivation, with vibrational characteristics corresponding to (bi)sulfite and (bi)sulfate groups. A mechanism of ZIF-8 degradation combining the synergistic effects of SO2 and humidity is proposed. Attack by sulfuric and sulfurous acid species (generated in humid SO2) leads to protonation of nitrogen in the imidazole ring, resulting in cleavage of metal–linker (Zn–N) bonds. Our detailed experimental findings serve as a starting point for developing a generalized mechanism of acid gas interactions with ZIF materials.},
doi = {10.1021/acs.jpcc.6b09197},
journal = {Journal of Physical Chemistry. C},
number = 48,
volume = 120,
place = {United States},
year = {Wed Nov 02 00:00:00 EDT 2016},
month = {Wed Nov 02 00:00:00 EDT 2016}
}

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