Hits:

Indexed by:期刊论文

Date of Publication:2015-06-11

Journal:JOURNAL OF PHYSICAL CHEMISTRY C

Included Journals:SCIE、EI、Scopus

Volume:119

Issue:23

Page Number:13080-13087

ISSN No.:1932-7447

Abstract:Tetraphenyladamantane-based microporous polybenzimidazoles were prepared through condensation polymerizations of 1,3,5,7-tetrakis(4-formyphenyl)adamantane with 3,3'-diaminobenzidine and 1,2,4,5-tetraaminobenzene tetrachloride, respectively, which exhibit large BET surface area up to 1023 m(2) g(-1) and narrow pore size distribution with pore size locating at about 0.6 nm. The sorption measurements show that they can uptake 17.3 wt % CO2 (273 K/1 bar), 1.6 wt % H-2 (77 K/1 bar), 98.0 wt % benzene, and 53.6 wt % cyclohexane (298 K, P/P-0 = 0.95). Moreover, according to the Henrys law initial slope method and ideal adsorbed solution theory, the resultant polymers possess high CO2/N-2 selectivity (71) and CO2/CH4 selectivity (12). The influences of porous structures, that is, porous size and distribution of the polymers, on the adsorption properties of gases and organic vapors are interpreted in terms of the pore-size-exclusive effect as well as variations of physicochemical parameters such as Henrys constants, first virial coefficients, enthalpies of adsorption, and kinetic diameters, critical temperatures of adsorbates.