Effect of acid-catalyzed formation rates of benzimidazole-linked polymers on porosity and selective CO2 capture from gas mixtures

Environmental Science & Technology
Suha AltarawnehHani M El-Kaderi

Abstract

Benzimidazole-linked polymers (BILPs) are emerging candidates for gas storage and separation applications; however, their current synthetic methods offer limited control over textural properties which are vital for their multifaceted use. In this study, we investigate the impact of acid-catalyzed formation rates of the imidazole units on the porosity levels of BILPs and subsequent effects on CO2 and CH4 binding affinities and selective uptake of CO2 over CH4 and N2. Treatment of 3,3'-Diaminobenzidine tetrahydrochloride hydrate with 1,2,4,5-tetrakis(4-formylphenyl)benzene and 1,3,5-(4-formylphenyl)-benzene in anhydrous DMF afforded porous BILP-15 (448 m(2) g(-1)) and BILP-16 (435 m(2) g(-1)), respectively. Alternatively, the same polymers were prepared from the neutral 3,3'-Diaminobenzidine and catalytic amounts of aqueous HCl. The resulting polymers denoted BILP-15(AC) and BILP-16(AC) exhibited optimal surface areas; 862 m(2) g(-1) and 643 m(2) g(-1), respectively, only when 2 equiv of HCl (0.22 M) was used. In contrast, the CO2 binding affinity (Qst) dropped from 33.0 to 28.9 kJ mol(-1) for BILP-15 and from 32.0 to 31.6 kJ mol(-1) for BILP-16. According to initial slope calculations at 273 K/298 K, a notable change in CO2/N2 s...Continue Reading

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Feb 26, 2014·Chemical Communications : Chem Comm·Suha AltarawnehHani M El-Kaderi

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Citations

May 27, 2016·ACS Applied Materials & Interfaces·Timur IslamogluHani M El-Kaderi
Jul 26, 2017·Advanced Materials·Lanfang ZouHong-Cai Zhou
Aug 15, 2017·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Christoph KlumpenJürgen Senker
May 26, 2016·Chemical Communications : Chem Comm·Bidhan C PatraAsim Bhaumik
Oct 11, 2016·Chemical Communications : Chem Comm·Ali K SekizkardesDavid Hopkinson
Dec 29, 2020·Journal of Colloid and Interface Science·Yafei SangYou-Nian Liu

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