Porous carbon materials for co2 separation in natural gas

Patent metadata

Field	Value
Publication number	US-2016136613-A1
Application number	US-201615001835-A
Country	US
Kind code	A1
Filing date	Jan 20, 2016
Priority date	Jan 11, 2012
Publication date	May 19, 2016
Grant date	—

Abstract

In some embodiments, the present disclosure pertains to materials for use in CO 2 capture in high pressure environments. In some embodiments, the materials include a porous carbon material containing a plurality of pores for use in a high pressure environment. Additional embodiments pertain to methods of utilizing the materials of the present disclosure to capture CO 2 from various environments. In some embodiments, the materials of the present disclosure selectively capture CO 2 over hydrocarbon species in the environment.

First claim

What is claimed:

1 . A material for use in CO 2 capture in high pressure environments, the material comprising, a porous carbon material containing a plurality of pores for use in a high pressure environment having a total pressure in the environment between about 2.5 to about 100 bar, to selectively capture CO 2 over hydrocarbons in the environment,
wherein a majority of the plurality of pores in the porous carbon material have a diameter of about 3 nm or less, wherein the surface area of the porous carbon material is between about 2,500 m 2 /g and about 4,500 m 2 /g, wherein the density of the porous carbon material is between about 0.3 g/cm 3 to about 4 g/cm 3 , and wherein the CO 2 absolute sorption capacity of the porous carbon material is between about 50 wt % and about 200 wt %.

2 . The material of claim 1 , wherein the porous carbon material is an asphalt-derived porous carbon.

3 . The material of claim 1 , wherein the porous carbon material is produced from a high fixed carbon content precursor selected from a group consisting of biochar, hydrochar, coal, lignite, biomass, organic substances containing heteroatoms such as nitrogen or sulfur, and combinations thereof;
wherein the precursor is heated at temperatures greater than 600° C.; and wherein CO 2 selectivity and CO 2 capacity of the porous carbon material is enhanced by functionalization of the porous carbon material surface during such heating.

4 . The material of claim 1 , wherein the porous carbon material is produced from a high fixed carbon content precursor selected from a group consisting of biochar, hydrochar, coal, lignite, biomass, organic substances containing heteroatoms such as nitrogen or sulfur, and combinations thereof; and
wherein the precursor is activated at a temperature between about 650° C. and about 1000° C. and in the presence of an amount of activating agent, to create and maintain micropores within the porous carbon material.

5 . The material of claim 1 , wherein, after capture, the CO 2 forms poly(CO 2 ) or a matrix of CO 2 within the porous carbon material.

6 . The material of claim 1 , wherein the porous carbon material has a CO 2 uptake of between about 0.92 g/g to about 1.50 g/g, at a CO 2 pressure or partial pressure of about 30 bar.

7 . The material of claim 1 , wherein the porous carbon material selectively captures CO 2 over CH 4 , such that the molecular ratio between CO 2 /CH 4 is between about 2 and about 10.

Assignees

• Univ Rice William M

Inventors

• Tour James M
• Schipper Desmond E
• Hwang Chih-Chau
• Tour Josiah
• Jalilov Almaz S
• Ruan Gedeng
• Li Yilun

Classifications

• B01J20/2808

  being less than 2 nm, i.e. micropores or nanopores · CPC title

• B01J20/28083

  being in the range 2-50 nm, i.e. mesopores · CPC title

• B01J20/20 Primary

  comprising free carbon; comprising carbon obtained by carbonising processes · CPC title

• B01J20/28011

  Other properties, e.g. density, crush strength · CPC title

• B01J20/28066

  being more than 1000 m2/g · CPC title