TY - JOUR
T1 - Effect of carbonization temperature on the physical properties and CO2 adsorption behavior of petroleum coke-derived porous carbon
AU - Jang, Eunji
AU - Choi, Seung Wan
AU - Lee, Ki Bong
N1 - Funding Information:
This research was supported by the National Research Foundation of Korea (NRF) through the C1 Gas Refinery Program funded by the Korean Ministry of Science and ICT (NRF-2018M3D3A1A01055761) and the “Public Technology Program based on Environment Policy” (E416-00070-0604-0) funded by the Korean Ministry of Environment.
PY - 2019/7/15
Y1 - 2019/7/15
N2 - Cost-effective porous carbons for CO2 capture were developed from petroleum coke using KOH as an activating agent. In particular, the effect of the carbonization temperature on the physical properties and CO2 adsorption behavior of the prepared porous carbons was investigated while keeping the other conditions constant during KOH activation. The highest specific surface area and total pore volume of 1470 m2/g and 0.60 cm3/g were obtained for the porous carbon carbonized at 500 °C, with higher carbonization temperatures resulting in reduced porosities. XRD and FTIR analyses revealed that the structural disorder and amount of surface functional groups, both of which are favorable for porosity development during activation, had opposite trends with increasing carbonization temperature. Therefore, an optimal carbonization temperature existed for the maximum porosity. The porous carbon carbonized at 500 °C exhibited the highest CO2 adsorption capacity of 4.17 mmol/g at 25 °C and 1 bar owing to its highest narrow micropore volume (pore size of less than 0.8 nm). In addition to its high CO2 adsorption capacity, the prepared porous carbon presented good selectivity for CO2 over N2, moderate heat of adsorption, fast adsorption kinetics, facile regeneration, and stable adsorption working capacity during consecutive adsorption and desorption cycles, indicating its promise in practical CO2 capture applications.
AB - Cost-effective porous carbons for CO2 capture were developed from petroleum coke using KOH as an activating agent. In particular, the effect of the carbonization temperature on the physical properties and CO2 adsorption behavior of the prepared porous carbons was investigated while keeping the other conditions constant during KOH activation. The highest specific surface area and total pore volume of 1470 m2/g and 0.60 cm3/g were obtained for the porous carbon carbonized at 500 °C, with higher carbonization temperatures resulting in reduced porosities. XRD and FTIR analyses revealed that the structural disorder and amount of surface functional groups, both of which are favorable for porosity development during activation, had opposite trends with increasing carbonization temperature. Therefore, an optimal carbonization temperature existed for the maximum porosity. The porous carbon carbonized at 500 °C exhibited the highest CO2 adsorption capacity of 4.17 mmol/g at 25 °C and 1 bar owing to its highest narrow micropore volume (pore size of less than 0.8 nm). In addition to its high CO2 adsorption capacity, the prepared porous carbon presented good selectivity for CO2 over N2, moderate heat of adsorption, fast adsorption kinetics, facile regeneration, and stable adsorption working capacity during consecutive adsorption and desorption cycles, indicating its promise in practical CO2 capture applications.
KW - CO adsorption
KW - Carbonization temperature
KW - KOH activation
KW - Narrow micropore
KW - Petroleum coke
KW - Porous carbon
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U2 - 10.1016/j.fuel.2019.03.051
DO - 10.1016/j.fuel.2019.03.051
M3 - Article
AN - SCOPUS:85062898162
VL - 248
SP - 85
EP - 92
JO - Fuel
JF - Fuel
SN - 0016-2361
ER -