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Dynamic Entangled Porous Framework for Hydrocarbon (C2–C3) Storage, CO 2 Capture, and Separation
Author(s) -
Sikdar Nivedita,
Bonakala Satyanarayana,
Haldar Ritesh,
Balasubramanian Sundaram,
Maji Tapas Kumar
Publication year - 2016
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201505217
Subject(s) - adsorption , porosity , selectivity , hydrocarbon , chemical engineering , polar , metal organic framework , porous medium , materials science , chemistry , nanotechnology , catalysis , organic chemistry , physics , engineering , astronomy
Storage and separation of small (C1–C3) hydrocarbons are of great significance as these are alternative energy resources and also can be used as raw materials for many industrially important materials. Selective capture of greenhouse gas, CO 2 from CH 4 is important to improve the quality of natural gas. Among the available porous materials, MOFs with permanent porosity are the most suitable to serve these purposes. Herein, a two‐fold entangled dynamic framework {[Zn 2 (bdc) 2 (bpNDI)]⋅4DMF} n with pore surface carved with polar functional groups and aromatic π clouds is exploited for selective capture of CO 2 , C2, and C3 hydrocarbons at ambient condition. The framework shows stepwise CO 2 and C 2 H 2 uptake at 195 K but type I profiles are observed at 298 K. The IAST selectivity of CO 2 over CH 4 is the highest (598 at 298 K) among the MOFs without open metal sites reported till date. It also shows high selectivity for C 2 H 2 , C 2 H 4 , C 2 H 6 , and C 3 H 8 over CH 4 at 298 K. DFT calculations reveal that aromatic π surface and the polar imide (RNC=O) functional groups are the primary adsorption sites for adsorption. Furthermore, breakthrough column experiments showed CO 2 /CH 4 C 2 H 6 /CH 4 and CO 2 /N 2 separation capability at ambient condition.