Functional use of CO2 for environmentally benign production of hydrogen through catalytic pyrolysis of polymeric waste
- Authors
- Jung, Sungyup; Choi, Dongho; Park, Young-Kwon; Tsang, Yiu Fai; Klingho, Naomi B.; Kim, Ki-Hyun; Kwon, Eilhann E.
- Issue Date
- Nov-2020
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- Hydrogen; Coke formation; Catalytic pyrolysis; Plastics; Valorization; Carbon dioxide
- Citation
- CHEMICAL ENGINEERING JOURNAL, v.399, pp.1 - 10
- Indexed
- SCIE
SCOPUS
- Journal Title
- CHEMICAL ENGINEERING JOURNAL
- Volume
- 399
- Start Page
- 1
- End Page
- 10
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/8806
- DOI
- 10.1016/j.cej.2020.125889
- ISSN
- 1385-8947
- Abstract
- A benign route for hydrogen (H-2) production is environmentally desirable. To achieve this, H-2 synthesis from polymeric waste was investigated. A new route was sought to maximize H-2 production with the least formation of coke during catalytic pyrolysis of fishing net waste (FNW) by using CO2 (as reaction media) and a Ni/SiO2 (as catalyst). The thermolytic characteristics of FNW were also evaluated under the CO2 condition (and N-2 as reference environment) both with and without catalysts to assess the full scope of variabilities involved in catalytic pyrolysis of FNW. The use of Ni/SiO2 catalyst in each of the N-2 and CO2 conditions improved the reaction kinetics in terms of syngas formation with significant production of H-2 (1,543 and 770 mmol g(-1) ca th(-1)) and CO (11 and 1157 mmol g(-1)cat h(-1)), respectively. However, H2 production rate dropped when the catalyst was deactivated due to (hydro)carbon deposition onto the catalyst surface under N-2 environment. Under CO2 environment, CO2 served as an oxidant during FNW thermolysis with additional CO formation and prolonged lifetime of catalyst (via suppressed deactivation). H-2 production mediated by CO2 increased to >= 1,093 mmol g(-1)cath(-1) during five repeated cycles of FNW pyrolysis, coupling with water-gas shift reaction (WGS: CO + H2O H-2 + CO2). This new approach to H-2 production is demonstrated as a practical measure for producing H-2 while extending catalyst life.
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