Highly microporous carbon

• US 5,710,092 A
• Filed: 03/14/1995
• Issued: 01/20/1998
• Est. Priority Date: 10/25/1993
• Status: Expired due to Term

• Current Assignee: Meadwestvaco (WestRock Company)
• Original Assignee: Westvaco Corporation (Meadwestvaco Corporation)
• Inventors: Baker, Frederick S.
• Primary Examiner(s): Caldarola, Glenn
• Assistant Examiner(s): BULLOCK, IN SUK C
• Application Number:
  US08/403,390
• Time in Patent Office: 1,043 Days
• Field of Search: 502/425, 502/427, 502/437, 502/426, 502/417, 502/416, 95/901
• US Class Current: 502/416
• CPC Class Codes: C01B 32/30 Active carbon
• CPC Class Codes: C01B 32/342 characterised by non-gaseous activating agents
• CPC Class Codes: C01B 32/348 Metallic compounds
• CPC Class Codes: F02B 43/00 Engines characterised by operating on gaseous fuels; Plants including such engines engines characterised by the gas-air charge being ignited by compression ignition of an additional fuel F02B7/06; engines convertible from gas to other fuel consumption F02B69/04
• CPC Class Codes: F02F 7/0085 Materials for constructing engines or their parts
• CPC Class Codes: F17C 11/007 for hydrocarbon gases, such as methane or natural gas, propane, butane or mixtures thereof [LPG]
• CPC Class Codes: Y02T 10/30 Use of alternative fuels, e.g. biofuels
• CPC Class Codes: Y10S 95/901 Activated carbon

Abstract

A highly microporous activated carbon is disclosed which is prepared by activation of an active carbon precursor material with a potassium hydroxide solution, pre-drying the blend to below 25% moisture content, activating this blend at from about 650° to about 1100° C., and acid washing and drying the microporous activated carbon product and which is characterized by greater than 50% of its total pore volume comprising pores of from above 8 Å to 20 Å in width and greater than 70% of its total pore volume comprising pores of less than 20 Å in width and greater than 95% of its total pore volume comprising pores of less than 50 Å in width.

Claims

1. A microporous activated carbon comprising an amount greater than 50% total pore volume of pores in the range of greater than 8 Å

up to 20 Å

in width and an amount greater than 95% of the total pore volume of pores up to 50 Å

in width, wherein the carbon is derived from lignocellulose material.

2. The microporous activated carbon of claim 1 further comprising an amount greater than 25% of the total pore volume of pores of 10 Å

to 16 Å

in width, an amount greater than 70% of the total pore volume of pores less than 20 Å

in width, and an amount greater than 98% of the total pore volume of pores less than 50 Å

in width.

3. The microporous activated carbon of claim 1 wherein the lignocellulose material is selected from a member of the group consisting of wood chips, sawdust, wood flour, paper, cotton linters, coconut shell, nut shells, and fruit pits.

4. The microporous activated carbon of claim 1 further comprising a total pore volume of at least 0.8 cc/g.

5. The microporous activated carbon of claim 4 further comprising a total pore volume of at least 1.0 cc/g.