期刊
FUEL PROCESSING TECHNOLOGY
卷 234, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.fuproc.2022.107319
关键词
Biochar adsorbent; CO2 capture; Carbon sequestration; Biochar-mineral composite; PSA/VSA assessment; Waste recycling
资金
- Hong Kong Environ-ment and Conservation Fund [104/2021]
- Hong Kong Green Tech Fund [GTF202020153]
- Fundamental Research Funds for the Central Universities [WK2090000037]
- Hong Kong Scholar Program [XJ2020022]
- University Research Facility in Chemical and Environmental Analysis (UCEA) of the Hong Kong Polytechnic University
Engineered biochar derived from wood waste pyrolysis in molten salts was developed for efficient CO2/N-2 separation. The production conditions were customized to enhance CO2 adsorption capacity and selectivity. K2CO3-Na2CO3-Li2CO3 biochar showed the highest CO2 capacity and selectivity. These findings demonstrate a new approach to upcycle biowaste into eco-friendly and effective adsorbents.
Engineered biochar derived from wood waste pyrolysis in molten salts were developed for effective CO2/N-2 separation. The production conditions were customized to obtain the biochar with high CO2 capture capacity and CO2/N-2 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 degrees C). High temperature (800 degrees 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-3600 (K2CO3-Na2CO3-Li2CO3 biochar) showed the highest CO2 capacity (4.5 mmol g(-1), 0 degrees C, 100 kPa) and the highest CO2/N-2 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.
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