Pre‐Carbonization: An Efficient Route to Improve the Textural and Gas Sorption Properties of Nitrogen‐Enriched Nanoporous Polytriazine

Abstract

AbstractAn unprecedented approach to improve the CO2 capture capacity by heating nitrogen enriched nanoporous polytriazine (NENP‐1) below the carbonization (pre‐carbonization) temperature has been invented. The NENP‐1 heated at 350 °C for 2 h (assigned as NENP‐1‐350) in argon atmosphere has improved specific surface area (SABET) marginally from 840 (NENP‐1) to 880 m2 g−1 (NENP‐1‐350). However, there was a substantial increase in the CO2 capture capacity from 22.9 (NENP‐1) to 33.8 wt% (NENP‐1‐350) measured at 0 °C and 1 bar. Although, both the specimens have comparable SABET, the NENP‐1‐350 has larger pore volume of 1.10 cm3 g−1 (as compared to 0.71 cm3 g−1 in NENP‐1) and larger pore size distribution (PSD) along with the higher isosteric heat of adsorption that contributed for such a high CO2 capture capacity. Unlike the CO2 capture capacity in the NENP‐1‐350, there was only marginal increase in the hydrogen storage capacity from 2.30 to 2.47 wt% and methane sorption capacity from 1.8 to 1.9 wt% measured at −196 and 0 °C, respectively, as compared to the NENP‐1.