Sorbent materials for co2 capture, uses thereof and methods for making same

A method for separating gaseous carbon dioxide from a gas mixture, containing said gaseous carbon dioxide as well as further gases different from gaseous carbon dioxide, by cyclic adsorption/desorption using a sorbent material adsorbing said gaseous carbon dioxide in a unit,

• wherein the method comprises at least the following sequential and in this sequence repeating steps (a)-(e):
• (a) contacting said gas mixture with the sorbent material to allow at least said gaseous carbon dioxide to adsorb on the sorbent material by flow-through through said unit essentially under ambient atmospheric pressure conditions and ambient atmospheric temperature conditions in an adsorption step;
• (b) isolating said sorbent material with adsorbed carbon dioxide in said unit from said flow-through;
• (c) inducing an increase of the temperature of the sorbent material, starting the desorption of carbon dioxide;
• (d) extracting at least the desorbed gaseous carbon dioxide from the unit and separating gaseous carbon dioxide in or downstream of the unit;
• (e) bringing the sorbent material essentially to ambient atmospheric temperature conditions and ambient atmospheric pressure conditions;
• wherein said sorbent material comprises or consists of a packed bed consisting of a mixture of
• 82-98 wt.-% of first particles of support material functionalised with primary or secondary amines, or a combination thereof, capable of reversibly binding carbon dioxide, and
• 2-18 wt.-% of second particles of support material which are non-functionalised and/or which are functionalised but where the functionalisation is deactivated,
• the weight percent of the first and second particles adding up to 100% of the mixture in the packed bed.