Carbon dioxide adsorption on poly(vinylidene chloride)-based carbons with ultrahigh microporosities prepared by facile carbonization

摘要

Poly(vinylidene chloride) (PVDC)-based carbon with high microporosity was prepared via facile carbonization, and further moderate KOH activation can widen micropore size with higher surface area and larger pore volume. A superior CO_2 capture uptake at 1 bar of up to 5.87 mmol/g at 0℃ and 3.98 mmol/g at 25 C is obtained for pristine carbon and the isosteric heat of CO_2 adsorption is in the range of 24-28 kj/mol, along with fast kinetics. The KOH activated sample shows a slightly low CO_2 uptake at 1 bar because activation produces some larger micropores in frameworks, resulting in the reduction of interactions between pores and CO_2 molecules.