Graphene membrane filter for gas separation
AssigneeGaznat SA
InventorsKumar Varoon Agrawal, Shiqi Huang
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Abstract
The invention relates to carbon supported crack- and tear-free graphene membranes of large area useful for selective gas separation, method of preparation and uses thereof. In particular, the invention relates to carbon supported crack- and tear-free graphene membranes having good gas separation performance, in particular high H2 permeance and H2/CH4 selectivities.
Claims20
A gas selective separation filter comprising a nanoporous graphene membrane having a thickness of about 0.34 to 2 nm and a porosity greater than 0.001%, a porous carbon substrate on which the graphene membrane is mounted, the porous carbon substrate having a porosity in a range of 5% to 90%, and a porous support structure on which the graphene membrane and porous carbon substrate are mechanically supported.
A method for the preparation of a gas selective separation filter comprising the steps of:
- a) providing a graphene membrane on a sacrificial support layer;
- b) coating said graphene membrane with an organic precursor of a porous carbon substrate;
- c) subjecting the organic precursor to a pyrolysis transforming the organic precursor into said porous carbon substrate on the graphene membrane, wherein the porous carbon substrate has a porosity between 5% and 90%;
- d) mounting the combined porous carbon substrate and graphene membrane on a macroporous support structure;
- and
- e) removing, before or after step d), at least portions of the sacrificial support layer.
Dependencies are inferred from the claim text.