Preparation and evaluation of activated carbon from low-rank coal via alkali activation and its fundamental CO₂ adsorption capacity at ambient temperature under pure pressurized CO₂

Abstract

The relationship between the CO2 adsorbed amount and specific surface area (a) or pore volumes (b) of the prepared activated carbon. The open plot is the prepared activated carbon. The solid plot is the activated carbon prepared from BN, TN, and SO.

Review on Coal-Based Activated Carbon: Preparation, Modification, Application, Regeneration, and Perspectives

“…The activation mechanism of K 2 CO 3 is shown in eqs and . In addition, K 2 CO 3 has a strong catalytic effect on coal gasification, in which it can catalyze coal to release more gas, thus promoting the formation of pore structure. − Mochizuki et al studied the influence of different mixing ratios of lignite, melamine, and K 2 CO 3 , activation temperatures and activation times on the CO 2 adsorption performance, and pore structure of CAC prepared using lignite as the raw material. The results showed that CAC obtained at a ratio of lignite, melamine, and K 2 CO 3 of 1:1:2, an activation temperature of 900 °C, and an activation time of 1 h had the highest BET specific surface area, total pore volume, and micropore volume.…”