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Comparative Evaluation of Different MOF and Non‐MOF Porous Materials for SO 2 Adsorption and Separation Showing the Importance of Small Pore Diameters for Low‐Pressure Uptake
Author(s) -
Brandt Philipp,
Nuhnen Alexander,
Öztürk Seçil,
Kurt Gülin,
Liang Jun,
Janiak Christoph
Publication year - 2021
Publication title -
advanced sustainable systems
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.499
H-Index - 24
ISSN - 2366-7486
DOI - 10.1002/adsu.202000285
Subject(s) - microporous material , zeolitic imidazolate framework , zeolite , adsorption , metal organic framework , mesoporous material , selectivity , materials science , chemical engineering , porosity , imidazolate , specific surface area , carbonization , inorganic chemistry , chemistry , organic chemistry , composite material , catalysis , engineering
The search for adsorbents for flue gas desulfurization processes is a current interest. For the first time, a comparative experimental study of SO 2 adsorption by porous materials including the prototypical metal–organic frameworks NH 2 ‐MIL‐101(Cr), Basolite F300 (Fe‐1,3,5‐BTC), HKUST‐1 (Cu‐BTC), the zeolitic imidazolate frameworks (ZIF)‐8, ZIF‐67, the alumosilicate Zeolite Y, the silicoaluminumphosphate (SAPO)‐34, Silica gel 60, the covalent triazine framework (CTF)‐1, and the active carbon Ketjenblack is carried out. Microporous materials with pore sizes in the range of 4–8 Å or with nitrogen heterocycles are found to be optimal for SO 2 uptake in the low‐pressure range. The SO 2 uptake capacity at 1 bar correlates with the Brunauer‐Emmett‐Teller‐surface area and pore volume rather independently of the surface microstructure. Zeolite Y and SAPO‐34 are stable toward humid SO 2 . The materials Zeolite Y and CTF‐1(600) show the most promising SO 2 /CO 2 selectivity results with an ideal adsorbed solution theory selectivity in the range of 265–149 and 63–43 with a mole fraction of 0.01–0.5 SO 2 , respectively, at 293 K and 1 bar.