Method of making modified activated carbon

摘要

A process for making modified activated carbon from an activated carbon substrate. The activated carbon substrate is pre-treated to make an exposed surface of the activated carbon substrate substantially hydrophilic, coated with a carbon precursor to form a coated activated carbon, and then the coated activated carbon substrate is heated to carbonize the carbon precursor to from the modified activated carbon. The modified activated carbon comprises a uniform porous carbon membrane formed on an exposed surface of the activated carbon substrate. The carbon membrane can mediate the absorption and/or adsorption kinetics of the activated carbon substrate. The modified activated carbon, which can be incorporated into one or more components of a cigarette, can selectively remove gaseous constituents from mainstream smoke during smoking.

主权项

1. A process for making modified activated carbon, said modified activated carbon comprising an activated carbon substrate and a uniform porous carbon membrane formed on an exposed surface of the activated carbon substrate, the process comprising:
(i) providing an activated carbon substrate; (ii) pre-treating the activated carbon substrate to make an exposed surface of the activated carbon substrate substantially hydrophilic; (iii) coating the pre-treated activated carbon substrate with a carbon precursor to form a coated activated carbon substrate; and (iv) heating the coated activated carbon substrate in an oxidizing atmosphere and at a temperature of from about 150° C. to 400° C. to carbonize the carbon precursor to form the uniform porous carbon membrane, wherein the carbon membrane has an average thickness having a standard deviation that is less than about 25% of the average thickness and the carbon membrane has an average thickness ranging from about 1 micron to 0.1 mm.