Journal
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
Volume 82, Issue -, Pages 576-596Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.rser.2017.09.032
Keywords
Waste plastics; Gasification; Reforming; Hydrogen; Syngas; Review
Funding
- Ministry of Economy and Competitiveness of the Spanish Government [CTQ2016-75535-R, CTQ2014-59574-JIN]
- Basque Government [IT748-13]
- University of the Basque Country [UFI 11/39]
- University of the Basque Country UPV/EHU
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The current review provides an assessment of the main waste plastics valorization routes to produce syngas and H-2, thus covering different gasification strategies and other novel alternative processes, such as pyrolysis and in-line catalytic steam reforming. The studies dealing with plastics gasification are in general scarce. However, due to the knowledge acquired on biomass and coal gasification, the state of development of plastic gasification technologies is considerable and, in fact, several gasification studies have been performed at pilot scale units. Air gasification is the most studied and developed strategy and pursues the production of a syngas for energy purposes. In spite of the higher H-2 content and heating value of the gas produced by steam gasification, this alternative faces significant challenges, such as the energy requirements of the process and the tar content in the syngas. Moreover, the co-gasification of plastics with coal and biomass appears to be a promising valorization route due to the positive impact on process performance and greater process flexibility. Other promising alternative is the pyrolysis and in-line reforming, which allows producing a syngas with high hydrogen content and totally free of tar.
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