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ID 58649
Author
Nishibata, Haruka Graduate School of Environmental and Life Science, Okayama University
Uddin, Md. Azhar Graduate School of Environmental and Life Science, Okayama University
Kato, Yoshiei Graduate School of Environmental and Life Science, Okayama University ORCID
Abstract
In order to explore the possibility of efficient chlorine removal from the poly (vinyl chloride) (PVC) containing waste plastics, simultaneous degradation and dechlorination of PVC at a relatively low temperature was investigated by changing the atmosphere gas and metal oxide as catalyst and/or adsorbent (catalyst/adsorbent). 5.0 g of PVC and various metallic oxides such as CaO, Fe3O4, SiO2, Al2O, Ca(OH)2, MgO were used under the superheated steam and nitrogen atmosphere of 473 K. The degradation rate of the PVC sample was small and the chlorine conversion to inorganic chloride was not observed without catalyst/adsorbent in the presence of either superheated steam or nitrogen atmosphere. Under the superheated steam atmosphere, the CaO catalyst/adsorbent resulted in much larger rates of degradation and dechlorination than any other metal oxides such as Fe3O4, SiO2, Al2O, Ca(OH)2, MgO compared with nitrogen atmosphere. The calcium compounds such as CaCl₂, CaClOH and Ca(OH)₂ were formed in the sample by the combination of CaO catalyst/adsorbent and superheated steam. The rates of PVC degradation and chlorine conversion to inorganic chlorides were dramatically enhanced beyond the stoichiometric CaO amount for the CaCl₂ formation reaction with PVC under the superheated steam atmosphere. The CaO addition contributed to both of the PVC degradation as a catalyst and the reactant with HCl as an adsorbent, whereas the superheated steam played a role of the sample temperature increase to promote the PVC degradation through the exothermic reaction with CaO.
Keywords
Dechloriation
Waste plastics
PVC
Superheated steam
CaO
Adsorbent
Catalyst
Note
This fulltext is available in May 2022.
Published Date
2020-05-26
Publication Title
Polymer Degradation and Stability
Volume
volume179
Publisher
Elsevier
Start Page
109225
ISSN
0141-3910
NCID
AA00362801
Content Type
Journal Article
language
英語
OAI-PMH Set
岡山大学
File Version
author
DOI
Web of Science KeyUT
Related Url
isVersionOf https://doi.org/10.1016/j.polymdegradstab.2020.109225
License
https://creativecommons.org/licenses/by-nc-nd/4.0/
Open Access (Publisher)
non-OA
Open Archive (publisher)
Non-OpenArchive