Impermeable polymer coating on selected honeycomb channel surfaces

摘要

Absorbent structures for CO2 capture include a honeycomb substrate having partition walls that extend through the honeycomb substrate. The partition walls have channel surfaces that define a plurality of individual channels including a plurality of reaction channels and a plurality of heat-exchange channels. The reaction channels and the heat-exchange channels are arranged such that individual reaction channels are in thermal communication with individual heat-exchange channels. Surfaces of the reaction channels surfaces include a sorbent material, and surfaces of the heat-exchange channels include a coating layer. The coating layer includes a water-impermeable layer formed from a polymer material. The polymer material of the water-impermeable layer does not substantially penetrate into the sorbent material of the partition walls or of the reaction-channel surfaces. Methods for forming the absorbent structures include coating the surfaces of the heat-exchange channels with the polymer material using a liquid composition such as an aqueous polymer emulsion.

主权项

1. An absorbent structure for CO2 capture comprising:
a honeycomb substrate having porous partition walls that extend through the honeycomb substrate in an axial direction from an inlet surface of the honeycomb substrate to an outlet surface of the honeycomb substrate opposite the inlet surface, the porous partition walls having channel surfaces that define a plurality of individual channels, wherein: the plurality of individual channels comprise a plurality of reaction channels and a plurality of heat-exchange channels, whereby the channel surfaces of the reaction channels are reaction-channel surfaces and the channel surfaces of the heat-exchange channels are exchange-channel surfaces; the reaction channels and the heat-exchange channels are arranged such that individual reaction channels are in thermal communication with individual heat-exchange channels; the reaction-channel surfaces comprise a sorbent material; the exchange-channel surfaces comprise at least one coating layer disposed thereon; and the at least one coating layer comprises a water-impermeable layer formed from a polymer material selected from the group consisting of poly(vinyl butyral) resins, polyacrylates, polynitriles, polychloroprenes, poly(vinyl chloride), poly(vinylidene fluoride), polyolefins, poly(tetrafluoroethylene), silicones, polyurethanes, mixtures thereof, and composites thereof; and the polymer material of the water-impermeable layer penetrates into the porous partition walls that form the exchange-channel surfaces by less than 25% of a width of the porous partition walls.