SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2022, Vol. 42 ›› Issue (2): 196-209.DOI: 10.1016/j.cjche.2020.09.074

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Improving hydrocarbons production via catalytic co-pyrolysis of torrefied-biomass with plastics and dual catalytic pyrolysis

Peter Keliona Wani Likun1,2, Huiyan Zhang1, Yuyang Fan1   

  1. 1. Key Laboratory of Thermal Energy Conversion and Control Ministry of Education, Southeast University, Nanjing 210096, China;
    2. Department of Mechanical Engineering, Juba University, Juba, P.O. Box 82, South Sudan
  • Received:2020-07-30 Revised:2020-09-24 Online:2022-03-30 Published:2022-02-28
  • Contact: Huiyan Zhang,E-mail:hyzhang@seu.edu.cn
  • Supported by:
    This work was supported by the National Natural Science Foundation for Excellent Young Scholarof China (51822604) and the Nature Science Foundation of Jiangsu Province for Distinguished Young Scholar (BK20180014).

Improving hydrocarbons production via catalytic co-pyrolysis of torrefied-biomass with plastics and dual catalytic pyrolysis

Peter Keliona Wani Likun1,2, Huiyan Zhang1, Yuyang Fan1   

  1. 1. Key Laboratory of Thermal Energy Conversion and Control Ministry of Education, Southeast University, Nanjing 210096, China;
    2. Department of Mechanical Engineering, Juba University, Juba, P.O. Box 82, South Sudan
  • 通讯作者: Huiyan Zhang,E-mail:hyzhang@seu.edu.cn
  • 基金资助:
    This work was supported by the National Natural Science Foundation for Excellent Young Scholarof China (51822604) and the Nature Science Foundation of Jiangsu Province for Distinguished Young Scholar (BK20180014).

Abstract: To increase the low yield and selectivity of aromatic hydrocarbons during the biomass pyrolysis process, we torrefied the biomass and then co-pyrolyzing with plastics such as high-density polyethylene (HDPE), polystyrene (PS), ethylene-vinyl acetate (EVA) and polypropylene (PP) and also single and dual catalyst layouts were investigated by Py-GC/MS. The results showed that non-catalytic fast pyrolysis (CFP) of raw bagasse (RBG) generated no aromatics. After torrefaction non-CFP of torrefied bagasse (TBG) generated low aromatic yield. Indicating that torrefaction would enhance the proportion of aromatics during the pyrolysis process. The CFP of TBG200℃ and TBG240℃ over ZSM-5 produced the total aromatic yield of 1.96 and 1.88 times higher, respectively, compared to non-CFP of TBG. Furthermore, the addition of plastic could increase H/Ceff ratio of the mixture, consequently, increase the yield of aromatic compounds. Among the various torrefied-bagasse/plastic mixtures, the CFP of TBG/EVA (7:3 ratio) mixture generated the highest the total aromatic yield of 7.7 times more than the CFP of TBG alone. The dual catalyst layout could enhance the yield of aromatics hydrocarbons. The dual-catalytic co-pyrolysis of TBG200℃/plastic (1:1) ratio over USY (ultra-stable Y zeolite)/ZSM-5, improved the total aromatics yield by 4.33 times more than the catalytic pyrolysis of TBG200oC alone over ZSM-5 catalyst. The above results showed that the yield and selectivities of light aromatic hydrocarbons can be improved via catalytic co-pyrolysis and dual catalytic co-pyrolysis of torrefied-biomass with plastics.

Key words: Torrefaction, Biomass, Plastics, Co-Pyrolysis, Dual-catalyst, Aromatics, Selectivity

摘要: To increase the low yield and selectivity of aromatic hydrocarbons during the biomass pyrolysis process, we torrefied the biomass and then co-pyrolyzing with plastics such as high-density polyethylene (HDPE), polystyrene (PS), ethylene-vinyl acetate (EVA) and polypropylene (PP) and also single and dual catalyst layouts were investigated by Py-GC/MS. The results showed that non-catalytic fast pyrolysis (CFP) of raw bagasse (RBG) generated no aromatics. After torrefaction non-CFP of torrefied bagasse (TBG) generated low aromatic yield. Indicating that torrefaction would enhance the proportion of aromatics during the pyrolysis process. The CFP of TBG200℃ and TBG240℃ over ZSM-5 produced the total aromatic yield of 1.96 and 1.88 times higher, respectively, compared to non-CFP of TBG. Furthermore, the addition of plastic could increase H/Ceff ratio of the mixture, consequently, increase the yield of aromatic compounds. Among the various torrefied-bagasse/plastic mixtures, the CFP of TBG/EVA (7:3 ratio) mixture generated the highest the total aromatic yield of 7.7 times more than the CFP of TBG alone. The dual catalyst layout could enhance the yield of aromatics hydrocarbons. The dual-catalytic co-pyrolysis of TBG200℃/plastic (1:1) ratio over USY (ultra-stable Y zeolite)/ZSM-5, improved the total aromatics yield by 4.33 times more than the catalytic pyrolysis of TBG200oC alone over ZSM-5 catalyst. The above results showed that the yield and selectivities of light aromatic hydrocarbons can be improved via catalytic co-pyrolysis and dual catalytic co-pyrolysis of torrefied-biomass with plastics.

关键词: Torrefaction, Biomass, Plastics, Co-Pyrolysis, Dual-catalyst, Aromatics, Selectivity