A versatile synthesis of metal-organic framework-derived porous carbons for CO2 capture and gas separation

摘要

We report a versatile fabrication method, detailed material characterization, pore architecture formation patterns, and surface functionality of MIL-100Al-derived porous carbons. Oxygen-doped porous carbons were prepared via carbonization of MIL-100Al, MIL-100Al/F127 composite, and MIL-100Al/KOH mixture. Microscopy tools showed different Al2O3 composite patterns and morphologies in the carbon particles, and a coherent discussion of versatile fabrication methods on carbon textural properties is demonstrated. The obtained porous carbons have a large specific surface area (up to 1097 m(2) g(-1)), well-developed narrow microporosity (up to 92% of the pore volume arises from micropores), and excellent CO2 adsorption capacities of 6.5 mmol g (1) at 273 K and 4.8 mmol g (1) at 298 K at an ambient pressure, which is among the highest reported so far for the MOF-derived carbons. Furthermore, excellent CO2/N-2 selectivity of 45, CO2/CH4 selectivity of 14.5, and CH4/N-2 selectivity of 5.1 were achieved at 298 K and 1 bar. Kinetic selectivity was also calculated, in which high CH4/N-2 selectivity (up to 11) was reached at 273 K and 1 bar. Potent gas separation performance and outstanding regenerability, demonstrated by breakthrough simulation and adsorption-desorption cycling tests, enable these MOF derived porous carbons to function as suitable solid adsorbents for CO2 capture from flue gas and bio-gas upgradation.