title: Carbon dioxide assisted sustainability enhancement of pyrolysis of waste biomass: A case study with spent coffee ground.
abstract: This work mainly presents the influence of CO2 as a reaction medium in the thermo-chemical process (pyrolysis) of waste biomass. Our experimental work mechanistically validated two key roles of CO2 in pyrolysis of biomass. For example, CO2 expedited the thermal cracking of volatile organic compounds (VOCs) evolved from the thermal degradation of spent coffee ground (SCG) and reacted with VOCs. This enhanced thermal cracking behavior and reaction triggered by CO2 directly led to the enhanced generation of CO (∼ 3000%) in the presence of CO2. As a result, this identified influence of CO2 also directly led to the substantial decrease (∼ 40-60%) of the condensable hydrocarbons (tar). Finally, the morphologic change of biochar was distinctive in the presence of CO2. Therefore, a series of the adsorption experiments with dye were conducted to preliminary explore the physico-chemical properties of biochar induced by CO2.
authors: Department of Environment and Energy, Sejong University, Seoul 143-747, South Korea.
authors: Dong-Wan
authors: DW
authors: Cho
authors: Department of Environment and Energy, Sejong University, Seoul 143-747, South Korea.
authors: Seong-Heon
authors: SH
authors: Cho
authors: Department of Environment and Energy, Sejong University, Seoul 143-747, South Korea.
authors: Hocheol
authors: H
authors: Song
authors: Department of Environment and Energy, Sejong University, Seoul 143-747, South Korea. Electronic address: ekwon74@sejong.ac.kr.
authors: Eilhann E
authors: EE
authors: Kwon
mesh_terms: D000327:Adsorption; D018533:Biomass; D002245:Carbon Dioxide / Q000494:pharmacology*; D002248:Carbon Monoxide / Q000032:analysis; D002606:Charcoal / Q000737:chemistry; D003069:Coffee / Q000737:chemistry*; D004396:Coloring Agents / Q000302:isolation & purification; D006859:Hydrogen; D008751:Methylene Blue / Q000737:chemistry; D009584:Nitrogen / Q000494:pharmacology; D012037:Refuse Disposal / Q000379:methods*; D013696:Temperature; D055549:Volatile Organic Compounds / Q000032:analysis; D014866:Waste Products / Q000032:analysis*
chemical_list: D003069:Coffee; D004396:Coloring Agents; D055549:Volatile Organic Compounds; D014866:Waste Products; C540010:biochar; D002245:Carbon Dioxide; D002606:Charcoal; D002248:Carbon Monoxide; D006859:Hydrogen; D009584:Nitrogen; D008751:Methylene Blue
keywords: Biomass waste; CO(2); Pyrolysis; Spent coffee ground (SCG); Thermo-chemical process