TY - JOUR
T1 - Customizing high-performance molten salt biochar from wood waste for CO2/N2 separation
AU - Sun, Mingzhe
AU - Zhu, Xiefei
AU - Wu, Chunfei
AU - Masek, Ondrej
AU - Wang, Chi Hwa
AU - Shang, Jin
AU - Ok, Yong Sik
AU - Tsang, Daniel C.W.
N1 - Funding Information:
We appreciate the financial support from the Hong Kong Environment and Conservation Fund (Project 104/2021 ) and Hong Kong Green Tech Fund ( GTF202020153 ) for this study. X.Z. thanks the funding of the Fundamental Research Funds for the Central Universities ( WK2090000037 ) and the Hong Kong Scholar Program ( XJ2020022 ). We also acknowledge the equipment support provided by the University Research Facility in Chemical and Environmental Analysis (UCEA) of the Hong Kong Polytechnic University .
Funding Information:
We appreciate the financial support from the Hong Kong Environment and Conservation Fund (Project 104/2021) and Hong Kong Green Tech Fund (GTF202020153) for this study. X.Z. thanks the funding of the Fundamental Research Funds for the Central Universities (WK2090000037) and the Hong Kong Scholar Program (XJ2020022). We also acknowledge the equipment support provided by the University Research Facility in Chemical and Environmental Analysis (UCEA) of the Hong Kong Polytechnic University.
Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2022/9
Y1 - 2022/9
N2 - Engineered biochar derived from wood waste pyrolysis in molten salts were developed for effective CO2/N2 separation. The production conditions were customized to obtain the biochar with high CO2 capture capacity and CO2/N2 selectivity by tuning the type of molten salts (MgCl2-KCl, ZnCl2-KCl, ZnCl2-NaCl-KCl, and K2CO3-Na2CO3-Li2CO3), salt/feedstock ratios (1:1 and 3:1) and pyrolysis temperatures (600 and 800 °C). High temperature (800 °C) and moderate salt loading (salt/feedstock ratio of 1:1) benefited the CO2 adsorption by providing an increased surface area and highly dispersed metal species as adsorption sites. PSL-3-800 and PSL-3-600 (K2CO3-Na2CO3-Li2CO3 biochar) showed the highest CO2 capacity (4.5 mmol g−1, 0 °C, 100 kPa) and the highest CO2/N2 selectivity (28.5), respectively, among the engineered biochar developed in this study. In addition, ZP-3-600 showed the highest selection parameter (S) in both PSA and VSA processes, indicating the promising CO2 capture performance under PSA/VSA conditions. A high recovery rate (89%) of molten salts was achieved. These results suggest a new pathway for upcycling biowaste as eco-friendly and effective adsorbents for gas adsorption and separation.
AB - Engineered biochar derived from wood waste pyrolysis in molten salts were developed for effective CO2/N2 separation. The production conditions were customized to obtain the biochar with high CO2 capture capacity and CO2/N2 selectivity by tuning the type of molten salts (MgCl2-KCl, ZnCl2-KCl, ZnCl2-NaCl-KCl, and K2CO3-Na2CO3-Li2CO3), salt/feedstock ratios (1:1 and 3:1) and pyrolysis temperatures (600 and 800 °C). High temperature (800 °C) and moderate salt loading (salt/feedstock ratio of 1:1) benefited the CO2 adsorption by providing an increased surface area and highly dispersed metal species as adsorption sites. PSL-3-800 and PSL-3-600 (K2CO3-Na2CO3-Li2CO3 biochar) showed the highest CO2 capacity (4.5 mmol g−1, 0 °C, 100 kPa) and the highest CO2/N2 selectivity (28.5), respectively, among the engineered biochar developed in this study. In addition, ZP-3-600 showed the highest selection parameter (S) in both PSA and VSA processes, indicating the promising CO2 capture performance under PSA/VSA conditions. A high recovery rate (89%) of molten salts was achieved. These results suggest a new pathway for upcycling biowaste as eco-friendly and effective adsorbents for gas adsorption and separation.
KW - Biochar adsorbent
KW - Biochar-mineral composite
KW - Carbon sequestration
KW - CO capture
KW - PSA/VSA assessment
KW - Waste recycling
UR - http://www.scopus.com/inward/record.url?scp=85131116324&partnerID=8YFLogxK
U2 - 10.1016/j.fuproc.2022.107319
DO - 10.1016/j.fuproc.2022.107319
M3 - Journal article
AN - SCOPUS:85131116324
SN - 0378-3820
VL - 234
JO - Fuel Processing Technology
JF - Fuel Processing Technology
M1 - 107319
ER -
