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Ex Situ Catalytic Pyrolysis of a Mixture of Polyvinyl Chloride and Cellulose Using Calcium Oxide for HCl Adsorption and Catalytic Reforming of the Pyrolysis Products
KTH Royal Institute of Technology, Sweden.
RISE - Research Institutes of Sweden, Bioeconomy, ETC Energy Technology Center.ORCID iD: 0000-0002-8264-4736
KTH Royal Institute of Technology, Sweden.
KTH Royal Institute of Technology, Sweden.
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2019 (English)In: Industrial & Engineering Chemistry Research, ISSN 0888-5885, E-ISSN 1520-5045, Vol. 58, no 31, p. 13960-13970Article in journal (Refereed) Published
Abstract [en]

In the context of chemical recycling of mixed plastics and paper, multitemperature step pyrolysis has shown good potential for the separation of oxygenated products from hydrocarbons. Here, we report results of an investigation of the first pyrolysis step at low temperature, which involves the dehydrochlorination of polyvinyl chloride (PVC) and the pyrolysis of cellulose, the main component of paper. Calcium oxide (CaO), selected for its chloride adsorption ability and its catalytic activity on biooil deoxygenation, was used for upgrading the downstream products from the pyrolysis. Additionally, we studied the performance of CaO for the simultaneous adsorption of HCl and for reforming cellulose pyrolysates in the temperature range of 300-600 °C with feedstock to CaO ratios of 1:0.2, 1:0.4, and 1:1. It was found that the suitable catalytic temperature for HCl and acetic acid adsorption is lower than 400 °C. This is due to the desorption of HCl from CaCl2 and Ca(OH)Cl in the presence of water and CO2 at 400 °C and higher. A larger amount of CaO resulted in a more efficient reduction of acids and the organic liquids were found to have lower amounts of oxygen. A comparison between the cases of neat and mixed feedstock showed that pyrolysis of mixed feedstock produced more water, H2, CO, and polycyclic aromatic hydrocarbons (PAHs) when compared to the case of neat materials over CaO

Place, publisher, year, edition, pages
American Chemical Society , 2019. Vol. 58, no 31, p. 13960-13970
Keywords [en]
Adsorption, Catalyst activity, Catalytic reforming, Cellulose, Feedstocks, Lime, Polycyclic aromatic hydrocarbons, Polyvinyl chlorides, Pyrolysis, Temperature, Acetic acid adsorption, Catalytic pyrolysis, Chemical recycling, Chloride adsorption, Dehydrochlorination, Oxygenated products, Polycyclic aromatic hydrocarbons (PAHS), Polyvinyl chloride (PVC), Chlorine compounds
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-39925DOI: 10.1021/acs.iecr.9b02299Scopus ID: 2-s2.0-85071301059OAI: oai:DiVA.org:ri-39925DiVA, id: diva2:1352812
Note

Funding details: Energimyndigheten; Funding details: Kungliga Tekniska Högskolan, KTH; Funding details: Korea Institute of Marine Science and Technology promotion, KIMST; Funding text 1: The authors appreciate financial support from the Swedish Energy Agency. N.S. is also grateful for the financial supported from DPST project from the Institute for the Promotion of Teaching Science and Technology (IPST), Thailand. Open access is supported by KTH library.

Available from: 2019-09-19 Created: 2019-09-19 Last updated: 2019-09-19Bibliographically approved

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Publisher's full textScopushttps://pubs.acs.org/doi/pdf/10.1021/acs.iecr.9b02299

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Sandström, Linda

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