Jump to main content
Jump to site search

Issue 6, 2017
Previous Article Next Article

Ultra-high surface area mesoporous carbons for colossal pre combustion CO2 capture and storage as materials for hydrogen purification

Author affiliations

Abstract

Carbon capture and storage (CCS) by solid adsorbents is currently attracting a great deal of attention. In this study, a new direction in the treatment of activatable carbon-containing precursors generated a family of mesoporous carbons that possess extremely high mesopore volume and hardly any microporosity. The mesoporous carbons, with up to 95% mesoporosity, have ultra-high surface area (2800–4000 m2 g−1) and pore volume (2.5–3.6 cm3 g−1). The porosity of the carbons, i.e., mesopores of size 25–50 Å and hardly any micropores, is favourable for CO2 uptake under conditions that are relevant to pre combustion CCS, i.e., 25 °C and pressure of 20 to 50 bar. The best performing carbons have near total absence of micropores; our findings suggest that the presence of microporosity is a limiting factor in the CO2 uptake capacity especially at high pressure (30–50 bar). The gravimetric (mmol g−1) CO2 uptake capacity of the mesoporous carbons is impressive; up to 28 (20 bar), 37 (30 bar), 46 (40 bar) and 55 (50 bar), which is equivalent to 2.42 g of CO2 per g of carbon. Furthermore, due to their packing density (0.25–0.4 g cm−3), the mesoporous carbons exhibit colossal volumetric CO2 uptake (in g l−1) of up to 480 (20 bar), 640 (30 bar), 780 (40 bar) and 930 (50 bar). The performance of the mesoporous carbons is such that, at 30 bar, they can hold more than 10 times the CO2 in a pressurized cylinder, and at 50 bar can store up to 470 cm3 cm−3. The all-round pre combustion CCS performance of the mesoporous carbons is significantly higher than that of the best carbons to date, and outperforms that of benchmark materials such as metal organic frameworks (MOFs). The carbons are highly suited, in terms of their CO2 adsorption capacity and CO2 selectivity over H2, as materials for hydrogen purification under syngas flow conditions.

Graphical abstract: Ultra-high surface area mesoporous carbons for colossal pre combustion CO2 capture and storage as materials for hydrogen purification

Back to tab navigation

Supplementary files

Publication details

The article was received on 22 May 2017, accepted on 29 Jun 2017 and first published on 30 Jun 2017


Article type: Paper
DOI: 10.1039/C7SE00300E
Citation: Sustainable Energy Fuels, 2017,1, 1414-1424
  •   Request permissions

    Ultra-high surface area mesoporous carbons for colossal pre combustion CO2 capture and storage as materials for hydrogen purification

    M. Cox and R. Mokaya, Sustainable Energy Fuels, 2017, 1, 1414
    DOI: 10.1039/C7SE00300E

Search articles by author

Spotlight

Advertisements