Patent ID: 7799733
Filing Date: 2010-09-21
Classification: C01B,H01M,Y02E

Abstract:
1. A process for the preparation of high surface area activated carbon from coconut shells which comprises cleaning the coconut shells, drying the cleaned coconut shells at a temperature within a first range, crushing the dried coconut shells, sieving the crushed coconut shells through 100-400 mesh to obtain uniform sized coconut shell powder, treating the shell powder with an activating agent, drying the treated coconut shell powder, carbonizing the powder in an inert atmosphere at a temperature within a second range of 300-400° for 3-6 h, cooling the carbonized powder to room temperature, activating the carbonized powder in an inert or oxidizing gas at a temperature within a third range of 600-700° C., said activating being carried out in an inert gas atmosphere to form the activated carbon powder with uniform pore size, cooling the activated carbon powder to room temperature, removing excess activating agent, washing with water to bring the powder to neutral pH and drying the washed powder to obtain the high surface area activated carbon with a nitrogen adsorption isotherm at 77 K, a BET surface area in the range 1500-2000 m 2 /g with average pore diameter 17-21 Å, layer and a capacitance in the range of 10-180 F/g.