Microporous carbon monoliths from natural carbohydrates

Patent metadata

Field	Value
Publication number	US-2018221851-A1
Application number	US-201515506158-A
Country	US
Kind code	A1
Filing date	Aug 22, 2015
Priority date	Aug 23, 2014
Publication date	Aug 9, 2018
Grant date	—

Abstract

A carbon pyrolyzate material is disclosed, having utility as an adsorbent as well as for energy storage and other applications. The pyrolyzate material comprises microporous carbon derived from low cost naturally-occurring carbohydrate source material such as polysaccharides. In adsorbent applications, the carbon pyrolyzate may for example be produced in a particulate form or a monolithic form, having high density and high pore volume to maximize gas storage and delivery, with the pore size distribution of the carbon pyrolyzate adsorbent being tunable via activation conditions to optimize storage capacity and delivery for specific gases of interest.

First claim

1 . A carbon pyrolyzate characterized by:
derivation from naturally-occurring carbohydrate source material; <1% total ash content, as determined by the procedure of ASTM D2866-11; piece density in a range of from 0.50 g/cc to 1.40 g/cc; N 2 BET surface area greater than 750 m2/gm; and methane adsorption capacity, at 21° C. and 35 bar pressure, of greater than 100V/V.

2 . The carbon pyrolyzate of claim 1 , in a particulate form.

3 . The carbon pyrolyzate of claim 1 , in a monolithic form.

4 . The carbon pyrolyzate of claim 1 , as a gas storage medium in a gas supply package.

5 - 8 . (canceled)

9 . The carbon pyrolyzate adsorbent of claim 1 , wherein the naturally-occurring carbohydrate source material comprises disaccharide or polysaccharide.

10 . The carbon pyrolyzate adsorbent of claim 1 , wherein the naturally-occurring carbohydrate source material comprises material selected from the group consisting of lactose, starches, natural gums, chitin, chitosan, amylose, amylopectin, dextrins, maltodextrin, and mixtures of the foregoing.

11 - 13 . (canceled)

14 . The carbon pyrolyzate adsorbent of claim 1 , in an activated form.

15 . The carbon pyrolyzate adsorbent of claim 14 , wherein the activated form has been activated by chemical and/or physical activation.

16 - 21 . (canceled)

22 . The carbon pyrolyzate adsorbent of claim 1 , having less than 0.5% total ash content, as determined by the procedure of ASTM D2866-11.

23 - 24 . (canceled)

25 . The carbon pyrolyzate adsorbent of claim 1 , wherein the adsorbent is binderless.

26 - 39 . (canceled)

40 . A gas supply package, comprising a gas supply vessel holding an adsorbent according to claim 1 .

41 - 46 . (canceled)

Assignees

• Entegris Inc

Inventors

• Petruska Melissa A
• Sturm Edward A
• Wilson Shaun M

Classifications

• B01J20/28016

  Particle form · CPC title

• C01B32/366

  by physical processes, e.g. by irradiation, by using electric current passing through carbonaceous feedstock or by using recyclable inert heating bodies · CPC title

• C01P2006/10

  Solid density · CPC title

• H01G11/34

  characterised by carbonisation or activation of carbon · CPC title

• B01J20/28057

  Surface area, e.g. B.E.T specific surface area · CPC title