Method to modify pore characteristics of porous carbon and porous carbon materials produced by the method
OwnerJaan Leis, Mati Arulepp +1inventors
InventorsJaan Leis, Mati Arulepp, Anti Perkson
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Abstract
A method to selectively increase in high-density porous carbon materials the pore size of such pores that are too small to be accessible for certain molecules. The method applies to porous carbon materials with a density of at least 0.6 g/cm3, with a microporosity of at least 0.45 cm3/g as measured by benzene absorption and with pore size distribution where at least 20% of the micropores are of size below 10 A. Specific surface of the precursor carbon material is typically >800 m2/g. The method further employs the use of such liquid oxidants for which the precursor material will function as a molecular sieve, water being a preferred such oxidant.
Claims8
A method of enlarging micropores having a size less than a predetermined size in a microporous carbon material comprising the steps of;
- selecting a liquid reagent acting as an oxidant at elevated temperature for which the molecules thereof are absorbed in the micropores to be enlarged;
- impregnating the carbon material with said liquid reagent;
- and thereafter heating the carbon material to a temperature exceeding the oxidizing temperature for said reagent.
A microporous carbon material having a bulk density of at least 0.6 g/cm3, a specific surface area of 1000-2200 m2/g and a relative specific surface area by pore size showing a maximum peak within the pore size range 0.75-2.1 nm according to the Density Functional Theory, at least 85% of the total surface area resulting from pores with a size less than two times of the average? peak pore size and less than 10% of the total surface area resulting from pores with a size less than 0.65 nm.
Dependencies are inferred from the claim text.