Selective adsorption of greenhouse gases on the residual carbon in lignite coal liquefaction
Journal
Journal of the Taiwan Institute of Chemical Engineers
Journal Volume
85
Pages
170-175
Date Issued
2018
Author(s)
Abstract
Adsorption of CO2, CH4, and N2 on activated carbon now is considered as a promising approach for greenhouse gas capture and/or separation. The objective of this study was to determine whether the residual carbon in lignite coal liquefaction could be used as an inexpensive and effective replacement for activated carbon. The chemical structure and functional groups transformation of residual carbon were analyzed using Fourier transform infrared (FTIR) and nuclear magnetic resonance (NMR). The adsorption properties of CO2, CH4, and N2 on the residual carbon were investigated at temperatures of 0 °C, 10 °C and 20 °C up to a pressure of 100 kPa. The adsorption kinetics and thermodynamics were also discussed from the uptake curves with the isothermal model. The separation of CO2/CH4, CH4/N2, and CO2/N2 binary mixtures was determined using ideal adsorbed solution theory (IAST) model. At 0 °C and 100 kPa, the simulated selectivities of CO2/CH4, CH4/N2, and CO2/N2 in 50/50 vol.% were 35, 11, and 38, respectively. Significant increased values than have previously been reported in the literature. The residual carbon from solvothermally treated lignite coal could be developed for greenhouse gas capture or biogas purification to achieve fuel grade quality. ? 2018 Taiwan Institute of Chemical Engineers
Subjects
Activated carbon; Adsorption; Air purification; Binary mixtures; Carbon dioxide; Chemical analysis; Coal; Coal liquefaction; Fourier transform infrared spectroscopy; Fuel purification; Gas fuel purification; Greenhouse gases; Lignite; Lignite liquefaction; Nuclear magnetic resonance; Thermodynamics; Adsorption properties; Biogas purifications; Fourier transform infrared; Ideal adsorbed solution theories (IAST); Isothermal modeling; Nuclear magnetic resonance(NMR); Selective adsorption; Solvothermal; Liquefaction of gases
Type
journal article