Nitrogen-doped nanoporous carbons derived from lignin for high CO2 capacity
- 5 Downloads
In this paper, nitrogen (N)-doped ultra-porous carbon derived from lignin is synthesized through hydrothermal carbonization, KOH activation, and post-doping process for CO2 adsorption. The specific surface areas of obtained N-doped porous carbons range from 247 to 3064 m2/g due to a successful KOH activation. N-containing groups of 0.62–1.17 wt% including pyridinic N, pyridone N, pyridine-N-oxide are found on the surface of porous carbon. N-doped porous carbon achieves the maximum CO2 adsorption capacity of 13.6 mmol/g at 25 °C up to 10 atm and high stability over 10 adsorption/desorption cycles. As confirmed by enthalpy calculation with the Clausius–Clapeyron equation, an adsorption heat of N-doped porous carbon is higher than non-doped porous carbon, indicating a role of N functionalities for enhanced CO2 adsorption capability. The overall results suggest that this carbon has high CO2 capture capacity and can be easily regenerated and reused without any clear loss of CO2 adsorption capacity.
KeywordsPorous carbon Microporous Biomass Lignin Chemical activation Nitrogen doping CO2 capture
This research was supported by both the National Research Foundation (NRF) funded by the Ministry of Science, ICT, and Future Planning (No. 2017M2A2A6A01021187), and the Energy Technology Development Project (ETDP) funded by the Ministry of Trade, Industry, and Energy (20172410100150), Republic of Korea.
- 27.Choi MS, Park S, Lee H, Park HS (2018) Hierarchically nanoporous carbons derived from empty fruit bunches for high performance supercapacitors. Carbon Lett 25:103Google Scholar