Effects of volatiles on properties of char during sequential pyrolysis of PET and cellulose

Chao Li, Yifan Sun, Qingyang Li, Lijun Zhang, Shu Zhang, Huaisheng Wang, Guangzhi Hu and Xun Hu

Renewable Energy, 2022, vol. 189, issue C, 139-151

Abstract: Interaction of the volatiles in co-pyrolysis of plastics and biomass is known to affect properties of pyrolysis products. Nevertheless, in co-pyrolysis, except the interaction between the volatiles, the volatiles could also interact with the char of same or different origin. Thus, understanding the specific effects of the volatiles of plastics/biomass on the evolution of the char from biomass/plastics is difficult. Hence, the investigation of the sequential pyrolysis of cellulose and polyethylene terephthalate (PET) at 600 °C was to explore the specific influences of volatiles from cellulose/PET in upper bed on the property of the char from PET/cellulose in lower bed. During sequential pyrolysis with cellulose in upper bed, the cellulose-derived oxygen-rich radicals promoted the cracking of the organic component on the PET-derived char, which significantly reduced the char yield while promoted the formation of heavy organics products and reduced hydrophobicity of the PET-derived char. Additionally, the cellulose-derived volatiles (e.g. ketones and aldehydes) involved in the secondary polymerization reactions with the volatiles from PET, forming more phenolics. PET-derived hydrocarbon-rich molecules did not promote charring reactions of the cellulose-derived char but increased hydrophobicity of the cellulose-char. Moreover, the varied interaction of the volatiles also significantly impacted thermal stability of the functional groups of char.

Keywords: Sequential pyrolysis; Polyethylene terephthalate (PET); Cellulose; Interaction of the volatiles; Properties of char (search for similar items in EconPapers)
Date: 2022
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Citations: View citations in EconPapers (3)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:189:y:2022:i:c:p:139-151

DOI: 10.1016/j.renene.2022.02.091

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