Catalytic co-pyrolysis of microwave pretreated chili straw and polypropylene to produce hydrocarbons-rich bio-oil

• Published in: Bioresource technology 2021-01, Vol.319, p.124191-124191, Article 124191
• Main Authors: Zhang, Xikui, Yu, Zhaosheng, Lu, Xiaoluan, Ma, Xiaoqian
• Format: Article
• Language: English
• Subjects: Chili straw; Co-pyrolysis; HZSM-5; Microwave pretreatment; Polypropylene
• ISSN: 0960-8524; 1873-2976
• DOI: 10.1016/j.biortech.2020.124191

[Display omitted] •Catalytic co-pyrolysis of microwave pretreated CS and PP over HZSM-5 was studied.•CS and PP showed the minimum activation energy in the co-feeding ratio of 1:1.•At 567 W, the residual mass, product oxygen compositions, E were all minimum.•Microwave pretreatment and HZSM-5 additive increased yield of hydrocarbons.•Co-pyrolysis kinetic behaviors were analyzed in two different temperature sections. In this work, the kinetic behavior and products of the co-pyrolysis of chili straw (CS) and polypropylene (PP) of distinguishing conditions (blending ratios, addition of catalysts, and microwave pretreatment at different power) had been investigated. Co-pyrolysis effectively reduced the proportion of oxygenated composition in CS, and the Oxygenated composition of 5CS5PP decreased by 76.69% compared to CS. When HZSM-5 was added, the aromatic hydrocarbons in the product increased from 4.46% to 17.34%, and the final residual mass decreased from 12.75% to 7.71%, illustrating that HZSM-5 had a positive effect on co-pyrolysis. Compared with P0HZSM-5, the microwave pretreatment at a higher power level of 567 W reduced the oxygenated composition from 17.41% to 13.09%, and the weight loss peak in the first stage increased from −18.11%/min to −19.94%/min. At the same time, the activation energy decreased from 271.25 kJ/mol to 231.13 kJ/mol.