Carbon dioxide membrane filter with graphene crown pores
AssigneeInternational Business Machines Corporation
InventorsBinquan Luan, Bruce Gordon Elmegreen
Life of this patent
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Abstract
A structure and method for carbon capture, e.g., in flue gas. An oxygen-terminated crown pore in graphene can be provided. Exposed carbon atoms on the pore edge can be bonded with oxygen to make a crown pore. When the CO2 is inside the pore, the electrostatic interaction becomes attractive because the positively charged carbon atom in CO2 is now exposed to negatively charged oxygen atoms on the crown pore edge. A favorable interaction between CO2 and the crown pore can be expected.
Claims25
A carbon dioxide membrane filter comprising at least one graphene sheet interspersed with holes that have open carbon bonds filled with another element, each of the holes tipped with said another element making up a crown pore.
A carbon dioxide membrane filter comprising a graphene sheet of carbon in a repeated hexagonal pattern, interspersed with holes that have open carbon bonds filled with another element, wherein each of the holes tipped with said another element makes up a crown pore, wherein the graphene sheet is shaped to a cylindrical structure having a zig-zag surface pattern with crown pores, wherein carbon dioxide is permitted to enter, via the crown pores, from a first side of the cylindrical structure to a second side of the cylindrical structure, wherein the first side and the second side have different pressures.
A graphene sheet with at least one hole, wherein edges of said at least one hole have exposed carbon atoms bonded with another element to make a crown pore.
A method of fabricating a carbon dioxide membrane filter comprising:
- causing ion-beam-sculpting on a graphene supported by a porous substrate;
- and
- performing oxidative etching to enlarge pores in the graphene,
- wherein carbon atoms exposed at the edges of the pores are bonded with another element.
A method of carbon capture, comprising:
- filtering carbon dioxide from flue gas using graphene having pores tipped with oxygen, wherein the flue gas is provided in an area of a first side of the graphene, and the carbon dioxide in the flue gas is caused to be transported to an area of a second side of the graphene via at least one of the pores.
Dependencies are inferred from the claim text.