Method for the preparation of high surface area high permeability carbons

Patent · Tue May 11 00:00:00 EDT 1999

OSTI ID:872280

Lagasse, Robert R ^[1]; Schroeder, John L ^[1]

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1. Albuquerque, NM

A method for preparing carbon materials having high surface area and high macropore volume to provide high permeability. These carbon materials are prepared by dissolving a carbonizable polymer precursor, in a solvent. The solution is cooled to form a gel. The solvent is extracted from the gel by employing a non-solvent for the polymer. The non-solvent is removed by critical point drying in CO.sub.2 at an elevated pressure and temperature or evaporation in a vacuum oven. The dried product is heated in an inert atmosphere in a first heating step to a first temperature and maintained there for a time sufficient to substantially cross-link the polymer material. The cross-linked polymer material is then carbonized in an inert atmosphere.

• Research Organization: Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA (United States)
• DOE Contract Number: AC04-94AL85000
• Assignee: Sandia Corporation (Livermore, CA)
• Patent Number(s): US 5902562
• Application Number: 08/960112
• OSTI ID: 872280
• Country of Publication: United States
• Language: English

Related Subjects

method
preparation
surface
permeability
carbons
preparing
carbon
materials
macropore
volume
provide
prepared
dissolving
carbonizable
polymer
precursor
solvent
solution
cooled
form
extracted
employing
non-solvent
removed
critical
drying
elevated
pressure
temperature
evaporation
vacuum
oven
dried
product
heated
inert
atmosphere
heating
step
maintained
time
sufficient
substantially
cross-link
material
cross-linked
carbonized
polymer precursor
carbon materials
cross-linked polymer
time sufficient
inert atmosphere
pore volume
carbon material
elevated pressure
polymer material
carbonizable polymer
heating step
/423/