Toward sustainable hydrogen storage and carbon dioxide capture in post-combustion conditions

摘要: Abstract This work addresses two environmental issues of major concern: hydrogen storage for economy implementation and CO2 capture to reduce greenhouse gas emissions. For these purposes, granular activated carbons were synthesized through chemical activation olive stones by means potassium salts (KOH K2CO3). The porosity characterizations reveal typical ultramicroporous with average pore sizes about 0.53 0.69 nm K2CO3 KOH-activated carbons, respectively. volumetric measurements cryogenic adsorption show monolayer process. At sub-atmospheric pressures the narrower micropores stronger binding energy molecules. However, at higher this range saturates carbon exhibits a H2 capacity 3 wt%, 70% which is achievable only 1 bar. shows similar behavior than when it was adsorbed purely 0 °C, AC_KOH retains its excellence 5.6 mmol g−1at Finally, tested as adsorbents in conditions representative post combustion applications (10% atmospheric pressure 50 °C). Both fast adsorption-desorption kinetics, perfectly described pseudo-first order model. conditions, proven that narrow are essential adsorption.