Direct air capture of CO2  with an Amine Resin: A molecular modeling study of the CO2 capturing process

Wim Buijs, Stijn de Flart

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

Several reactions, known from other amine systems for CO2 capture, have been proposed for Lewatit R VP OC 1065. The aim of this molecular modeling study is to elucidate the CO2 capture process: the physisorption process prior to the CO2-capture and the reactions. Molecular modeling yields that the resin has a structure with benzyl amine groups on alternating positions in close vicinity of each other. Based on this structure, the preferred adsorption mode of CO2 and H2O was established. Next, using standard Density Functional Theory two catalytic reactions responsible for the actual CO2 capture were identified: direct amine and amine-H2O catalyzed formation of carbamic acid. The latter is a new type of catalysis. Other reactions are unlikely. Quantitative verification of the molecular modeling results with known experimental CO2 adsorption isotherms, applying a dual site Langmuir adsorption isotherm model, further supports all results of this molecular modeling study.
Original languageEnglish
Pages (from-to)12297–12304
JournalIndustrial and Engineering Chemistry Research
Volume56
Issue number43
DOIs
Publication statusPublished - 2017

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