[논문]기능성 바이오차 생산을 위한 이산화탄소의 영향 평가

이상윤; 이태우; 권일한

doi:10.7857/jsge.2022.27.2.041

기능성 바이오차 생산을 위한 이산화탄소의 영향 평가
Evaluation of the Effects of Carbon Dioxide on the Production of Engineered Biochar 원문보기

지하수토양환경 = Journal of soil and groundwater environment, v.27 no.2, 2022년, pp.41 - 49

이상윤 (한양대학교 자원환경공학과) , 이태우 (한양대학교 자원환경공학과) , 권일한 (한양대학교 자원환경공학과)

Abstract ▼ AI-Helper

To abate the environmental burdens arising from CO2 emissions, biochar offers a strategic means to sequester carbons due to its recalcitrant nature. Also, biochar has a great potential for the use as carbon-based adsorbent because it is a porous material. As such, developing the surface properties of biochar increases a chance to produce biochar with great adsorption performance. Given that biochar is a byproduct in biomass pyrolysis, characteristics of biochar are contingent on pyrolysis operating parameters. In this respect, this work focused on the investigation of surface properties of biochar by controlling temperature and reaction medium in pyrolysis of pine sawdust as case study. In particular, CO2 was used as reaction medium in pyrolysis process. According to pyrolytic temperature, the surface properties of biochar were indeed developed by CO2. The biochar engineered by CO2 showed the improved capability on CO2 sorption. In addition, CO2 has an effect on energy recovery by enhancing syngas production. Thus, this study offers the functionality of CO2 for converting biomass into engineered biochar as carbon-based adsorbent for CO2 sorption while recovering energy as syngas.

주제어

표/그림 (8)

그림 Fig. 1. Schematic diagram of experimental setting for producing biochar derived from pine sawdust in N₂ and CO₂ atmospheres.
그림 Fig. 2. Mass loss pattern and thermolytic rate of pine sawdust as the function of temperature in N₂ and CO₂ atmospheres.
그림 Fig. 3. Evolution profile of H₂, CH₄, and CO during pyrolysis of pine sawdust in N₂ and CO₂ atmospheres.
그림 Fig. 4. Mass loss pattern of pine sawdust under N₂ and CO₂ environments at the isothermal temperatures (for 1 h) of (a) 700°C and (b) 800°C.
그림 Fig. 5. N2 adsorption/desorption isotherm curve and BET results (specific surface area, pore volume, and mean pore diameter) of biochar during pyrolysis of pine sawdust in N₂ and CO₂ atmospheres at the isothermal temperatures (for 1 h) of (a) 700°C and (b) 800°C.
그림 Fig. 6. CO2 sorption test of biochar from pyrolysis of pine sawdust under N₂ and CO₂ environments at the isothermal temperatures (for 1 h) of (a) 700°C and (b) 800°C.
표 Table 1. Comparison of surface properties and CO₂ sorption capacity (at 1 bar and 25°C) of different biochars
표 Table 2. Specific surface area and CO₂ sorption capacity (at 1 bar and 25°C) of biochars generated from various pyrolysis conditions

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