Thermochemical conversion of polyethylene in a fluidized bed: Impact of transition metal-induced oxygen transport on product distribution
Artikel i vetenskaplig tidskrift, 2022

Thermochemical conversion in dual fluidized bed (DFB) systems is a potential alternative to the recycling of abundantly available plastic waste. The development of oxygen transport in DFB systems is in most cases unavoidable due to the transition metal content of the bed material as well as the metal fraction in the waste stream. This work investigates the influence of transition metal oxide-induced oxygen transport on the thermochemical conversion of high-density polyethylene, a model plastic feedstock, in a bubbling fluidized bed reactor. Conversion in the reactor at 700 °C was investigated using four different bed materials that had different concentrations of iron oxide. The share of carbon oxides among the gaseous products increased with an increase in the iron oxide content of the bed material. The yield of light olefinic and paraffinic compounds decreased with increased iron oxide content of the bed. The presence of iron oxide in the bed material significantly increased the formation rates of aromatic compounds and solid carbon deposits on the bed material. The observed shift in the product distribution due to oxygen transport follows a dehydrogenation-type reaction mechanism.

Dehydrogenation

Oxygen transport

Thermochemical conversion

Polyethylene

Dual fluidized bed

Transition metals

Författare

Chahat Mandviwala

Chalmers, Rymd-, geo- och miljövetenskap, Energiteknik

Teresa Berdugo Vilches

Chalmers, Rymd-, geo- och miljövetenskap, Energiteknik

Martin Seemann

Chalmers, Rymd-, geo- och miljövetenskap, Energiteknik

Robin Faust

Chalmers, Kemi och kemiteknik, Energi och material

Henrik Thunman

Chalmers, Rymd-, geo- och miljövetenskap, Energiteknik

Journal of Analytical and Applied Pyrolysis

0165-2370 (ISSN)

Vol. 163 105476

Utveckling av ångrackning av plast för en transformativ omställning av petrokemiska kluster

Energimyndigheten (49514-1), 2020-01-01 -- 2024-12-31.

Borealis AB, 2020-01-01 -- 2024-12-31.

Ämneskategorier

Oorganisk kemi

Materialkemi

Bioenergi

Infrastruktur

Chalmers materialanalyslaboratorium

DOI

10.1016/j.jaap.2022.105476

Mer information

Senast uppdaterat

2022-03-28