Hydrated porous materials for selective co2 capture

Patent metadata

Field	Value
Publication number	US-2018008957-A1
Application number	US-201715640765-A
Country	US
Kind code	A1
Filing date	Jul 3, 2017
Priority date	Aug 25, 2015
Publication date	Jan 11, 2018
Grant date	—

Abstract

In some embodiments, the present disclosure pertains to methods of capturing CO 2 from an environment by hydrating a porous material with water molecules to the extent thereby to define a preselected region of a plurality of hydrated pores and yet to the extent to allow the preselected region of a plurality of pores of the porous material to uptake gas molecules; positioning the porous material within a CO 2 associated environment; and capturing CO 2 by the hydrated porous material. In some embodiments, the pore volume of the hydrated porous material includes between 90% and 20% of the pre-hydrated pore volume to provide unhydrated pore volume within the porous material for enhanced selective uptake of CO 2 in the CO 2 associated environment. In some embodiments, the step of capturing includes forming CO 2 -hydrates within the pores of the porous material, where the CO 2 ·n/H 2 O ratio is n<4.

First claim

What is claimed is:

1 . A method of capturing CO 2 from an environment, the method comprising:
hydrating a porous material with water molecules to the extent thereby to define a preselected region of a plurality of hydrated pores and yet to the extent to allow the preselected region of a plurality of pores of the porous material to uptake gas molecules; positioning the porous material within a CO 2 associated environment; and capturing CO 2 by the hydrated porous material.

2 . The method of claim 1 , wherein the porous material comprises a plurality of nucleophilic moieties.

3 . The method of claim 1 , wherein the hydrating step comprises imbibing a plurality of pores of a predefined region of the porous material with water molecules.

4 . The method of claim 1 , wherein prior to the step of hydrating the porous material, pore volume of the porous material comprises at least 0.5 cm 3 /g to thereby define a pre-hydrated pore volume, and wherein after the step of hydrating the porous material, the pore volume of the hydrated porous material comprises less than 90% of the pre-hydrated pore volume thereby to provide unsaturated pores of the porous material and enhanced for selective uptake of the CO 2 in the CO 2 associated environment.

5 . The method of claim 4 , further comprising reducing saturation of the pores to a value less than 100%.

6 . The method of claim 5 , wherein the pore volume of the hydrated porous material comprises between 90% and 20% of the pre-hydrated pore volume to provide unhydrated pore volume within the porous material for enhanced selective uptake of CO 2 in the CO 2 associated environment.

7 . The method of claim 4 , further comprising the step of determining pore volume by porosimetry measurements.

8 . The method of claim 1 , further comprising forming one or more ordered matrices within the pores, the one or more ordered matrices comprising gas-hydrates.

9 . The method of claim 1 , wherein the step of capturing includes forming CO 2 -hydrates within the pores of the porous material, and wherein the CO 2 ·n/H 2 O ratio is n<4.

10 . The method of claim 3 , wherein the water molecules comprise a form of gas hydrates positioned within the plurality of pores.

11 . The method of claim 3 , wherein the water molecules are associated with water soluble additives.

12 . The method of claim 11 , wherein the water soluble additives are selected from the group consisting of salts, bases, organic solvents, organic amines, fluorocarbons, small molecules, oligomers, polymers, and combinations thereof.

13 . The method of claim 1 , wherein the porous material has a CO 2 capture capacity of about 50% to about 250% of the porous material weight.

14 . The method of claim 1 , wherein the molar ratio of captured CO 2 over captured hydrocarbon in porous material ranges from 10 to about 250.

15 . The method of claim 1 , wherein the molar ratio of captured CO 2 over captured hydrocarbons in the porous carbon material is more than 200.

16 . The method of claim 1 , wherein the porous material is selected from the groups consisting of porous organic frameworks, metal-organic frameworks, zeolites, molecular sieves, porous carbon materials, and combinations thereof.

17 . The method of claim 1 , wherein the porous material is a porous carbon material.

18 . The method of claim 1 , wherein CO 2 associated environment comprises a natural gas stream that also contains water vapor.

19 . The method of claim 1 , wherein the capture of CO 2 by the hydrated pores of the porous material occurs selectively over hydrocarbons in the environment.

20 . The method of claim 1 , further comprising a step of releasing the captured CO 2 from the porous material thereby to maintain hydration within the porous material.

21 . The method of claim 20 , further comprising a step of reusing the plurality of hydrated pores of the porous material after the releasing to capture additional CO 2 from an environment.

22 . The method of claim 1 , wherein the porous material comprises ultra-high surface area porous carbon material.

Assignees

• Tour James M
• Jalilov Almaz S
• Univ Rice William M

Inventors

• Tour James M
• Jalilov Almaz S

Classifications

• B01D2253/102

  Carbon · CPC title

• B01D2256/24

  Hydrocarbons · CPC title

• C10L2290/542

  Adsorption of impurities during preparation or upgrading of a fuel · CPC title

• B01D2257/504

  Carbon dioxide · CPC title

• B01J20/28073

  being in the range 0.5-1.0 ml/g · CPC title