Activated carbon filter and process for the separation of noxious gases
AssigneeThe Secretary of State for Defence in Her Brittanic Majesty's Government of the United Kingdom of Great Britain and Northern Ireland
InventorsMatthew J Chinn, Paul R Norman, Philip A Barnes, Elizabeth A Dawson
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Abstract
Activated carbon filters containing transition metals, are prepared by (a) exchanging the transition metal with a cellulose ion exchange material to produce a cellulose material containing the transition metal; (b) charring of the product of (a); activating the product of (b) to form an activated carbon filter having a pore network throughout; and removing surface carbon substantially throughout the pore network of the filter formed in (c). Methods of filtering an atmosphere containing a gaseous contaminant by passing the contaminated atmosphere through a filter made by this process are described.
Claims21
A method of manufacture of an activated carbon filter comprising at least one transition metal, the method comprising:
- (a) exchanging of at least one transition metal with a cellulose ion exchange material to produce a cellulose material comprising the at least one transition metal;
- (b) charring of the product of (a);
- (c) activating the product of (b) to form an activated carbon filter having a pore network throughout;
- and
- (d) removing surface carbon substantially throughout the pore network of the filter formed in (c).
An activated carbon filter containing at least one transition metal, wherein the carbon filter has a structure in which there is a lattice of interconnecting pores, said at least one transition metal being trapped at pore junctions and is substantially uniformly distributed throughout the carbon, and wherein the filter material has been prepared in a process including the exchange of at least one transition metal with a cellulose ion exchange resin and the removal of surface carbon from the pore network of the filter.
Dependencies are inferred from the claim text.