Preparation of carbon molecular sieves from carbon micro and nanofibers for sequestration of CO2 (original) (raw)
2011, Chemical Engineering Research and Design
In this study, a hierarchal web of carbon micro and nanofibers was used as a precursor for the synthesis of a carbon molecular sieve (CMS). CMSs were prepared by thermal treatment of carbon fibers using a microwave heating device. The heating power and treatment time were optimized for the maximum performance of the prepared CMS for the separation of CO 2 at low concentrations from the gaseous mixture of CO 2 and air under dynamic (flow) conditions. Based on the experimental data, microwave power input of 240 W and treatment time of 15 min were found to be suitable for the maximum uptake of CO 2 by CMS. Adsorption breakthrough curves were obtained at different gas flow rates and CO 2 concentrations. CMSs prepared from the hierarchal web of carbon micro and nanofibers were found to be superior to those prepared from ACF. The CO 2 uptake was determined to be approximately 0.88 mg/g and 10 mg/g at concentrations of 500 ppm and 5000 ppm, respectively, in air.
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