Article

Adsorption

, Volume 14, Issue 6, pp 755-762

Amine functionalised metal organic frameworks (MOFs) as adsorbents for carbon dioxide

  • Bjørnar ArstadAffiliated withSINTEF Materials and Chemistry
  • , Helmer FjellvågAffiliated withCentre for Materials Science and Nanotechnology and Department of Chemistry, University of Oslo
  • , Kjell Ove KongshaugAffiliated withCentre for Materials Science and Nanotechnology and Department of Chemistry, University of Oslo
  • , Ole SwangAffiliated withSINTEF Materials and Chemistry
  • , Richard BlomAffiliated withSINTEF Materials and Chemistry Email author 

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Abstract

Three different porous metal organic framework (MOF) materials have been prepared with and without uncoordinated amine functionalities inside the pores. The materials have been characterized and tested as adsorbents for carbon dioxide. At 298 K the materials adsorb significant amount of carbon dioxide, the amine functionalised adsorbents having the highest CO2 adsorption capacities, the best adsorbing around 14 wt% CO2 at 1.0 atm CO2 pressure. At 25 atm CO2 pressure, up to 60 wt% CO2 can be adsorbed. At high pressures the CO2 uptake is mostly dependent on the available surface area and pore volume of the material in question. For one of the iso-structural MOF pairs the introduction of amine functionality increases the differential adsorption enthalpy (from isosteric method) from 30 to around 50 kJ/mole at low CO2 pressures, while the adsorption enthalpies reach the same level at increase pressures. The high pressure experimental results indicate that MOF based solid adsorbents can have a potential for use in pressure swing adsorption of carbon dioxide at elevated pressures.

Keywords

Metal organic frameworks Amine functionality Carbon dioxide Adsorption