CO2-cofed catalytic pyrolysis of tea waste over Ni/SiO2 for the enhanced formation of syngas
- Title
- CO2-cofed catalytic pyrolysis of tea waste over Ni/SiO2 for the enhanced formation of syngas
- Author
- 권일한
- Keywords
- Waste-to-energy; Thermolysis; Fuel production; Biomass valorization; Carbon dioxide
- Issue Date
- 2020-09
- Publisher
- ELSEVIER
- Citation
- JOURNAL OF HAZARDOUS MATERIALS, v. 397, article no. 122637
- 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.
- URI
- https://www.sciencedirect.com/science/article/pii/S0304389420306269?via%3Dihubhttps://repository.hanyang.ac.kr/handle/20.500.11754/170754
- ISSN
- 0304-3894; 1873-3336
- DOI
- 10.1016/j.jhazmat.2020.122637
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > EARTH RESOURCES AND ENVIRONMENTAL ENGINEERING(자원환경공학과) > Articles
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