LAUSR

Abstract Porous organic polymers (POPs) with high Brunauer-Emmett-Teller (BET) surface area (SBET) and plentiful heteroatoms are promising for CO2 capture and separation. Herein a series of melamine-based porous polyamides were synthesized from melamine and binary/ternary benzoic acid by one-pot polycondensation strategy. These polymers have considerably high SBET (up to 521 m2/g) and enriched nitrogen (13.8–44.9 wt%). Importantly, they possess noteworthy CO2 uptake (0.53–2.9 mmol/g at 273 K and 1 bar), the synergistic effect of predominant microporosity and abundant nitrogen are beneficial. Moreover, they have moderate isosteric heats (Qst) (29.5–43.7 kJ/mol) and acceptable CO2/N2 selectivity (IAST: 31.6–277.8), which are highly relevant to the micropore volume, micropore area, and nitrogen content.