CO2-cofed catalytic pyrolysis of tea waste over Ni/SiO2 for the enhanced formation of syngas
- Authors
- Kim, Jung-Hun; Jung, Sungyup; Park, Young-Kwon; Kwon, Eilhann E.
- Issue Date
- Sep-2020
- Publisher
- ELSEVIER
- Keywords
- Waste-to-energy; Thermolysis; Fuel production; Biomass valorization; Carbon dioxide
- Citation
- Journal of Hazardous Materials, v.396, pp.1 - 12
- Indexed
- SCIE
SCOPUS
- Journal Title
- Journal of Hazardous Materials
- Volume
- 396
- Start Page
- 1
- End Page
- 12
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/190761
- DOI
- 10.1016/j.jhazmat.2020.122637
- ISSN
- 0304-3894
- Abstract
- To valorize tea waste (TW), catalytic pyrolysis was done as a practical measure for recovering energy as a form of syngas. Considering CO2 as a reactive gas medium in place of conventional pyrolysis gas, a sustainable pyrolysis platform was established. In addition, mechanistic effectiveness of CO2 on TW pyrolysis was examined. In the presence of CO2 , homogeneous reaction with volatile organic compounds (VOCs) derived from TW pyrolysis contributed to CO formation. To enhance the formation of syngas at low pyrolysis temperature, catalytic pyrolysis over a Ni/SiO2 was investigated. The synergistic effects of Ni/SiO2 catalyst and CO2 promoted thermal cracking of VOCs and further homogeneous reaction with CO2 , thereby resulting in the substantial enhancement (28 times more) of H-2 and CO production than non-catalytic pyrolysis. It was also confirmed that CO2 could be considered a reactive gas medium to produce biochar (34-35 wt.% yield), having competitive porosity and surface area, in comparison to that from pyrolysis in N-2. Therefore, CO2 can be employed to build a sustainable waste conversion platform for energy and biochar production through pyrolysis instead of using N-2.
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