SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2022, Vol. 46 ›› Issue (6): 126-133.DOI: 10.1016/j.cjche.2021.07.011

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Production of aromatic hydrocarbons by co-cracking of bio-oil and ethanol over Ga2O3/HZSM-5 catalysts

Xing Zhang, Jingfeng Wu, Junhao Chen, Liang Lu, Lingjun Zhu, Shurong Wang   

  1. State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
  • 收稿日期:2021-03-24 修回日期:2021-06-22 出版日期:2022-06-28 发布日期:2022-07-20
  • 通讯作者: Lingjun Zhu,E-mail:lingjun_zhu@zju.edu.cn;Shurong Wang,E-mail:srwang@zju.edu.cn
  • 基金资助:
    This work was supported by the Innovative Research Groups of the National Natural Science Foundation of China (51621005).

Production of aromatic hydrocarbons by co-cracking of bio-oil and ethanol over Ga2O3/HZSM-5 catalysts

Xing Zhang, Jingfeng Wu, Junhao Chen, Liang Lu, Lingjun Zhu, Shurong Wang   

  1. State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
  • Received:2021-03-24 Revised:2021-06-22 Online:2022-06-28 Published:2022-07-20
  • Contact: Lingjun Zhu,E-mail:lingjun_zhu@zju.edu.cn;Shurong Wang,E-mail:srwang@zju.edu.cn
  • Supported by:
    This work was supported by the Innovative Research Groups of the National Natural Science Foundation of China (51621005).

摘要: The catalytic cracking of bio-oil is important to produce aromatic hydrocarbons, which can partially replace gasoline or diesel to greatly reduce carbon emissions from transportation. To further promote the formation of aromatic hydrocarbons, this work studied the effects of the preparation method and the acid strength of Ga2O3/HZSM-5 on catalytic cracking of the bio-oil distilled fraction systematically. The preparation method of Ga2O3/HZSM-5 had an important effect on its catalytic activity: the Ga2O3/HZSM-5 prepared by physical mixing showed the low dispersion of active phases and poor pore structure, resulting in its insufficient activity and severe coke deposition; the Ga2O3/HZSM-5 prepared by precipitation exhibited the higher activity, while many polycyclic aromatic hydrocarbons unfavorable for the subsequent utilization were in the oil phase; the Ga2O3/HZSM-5 prepared by impregnation showed the highest activity and 35.5% (mass) selectivity of the oil phase, including 80.3% monocyclic aromatic hydrocarbons and 12.0% polycyclic aromatic hydrocarbons. The Brønsted acidity of Ga2O3/HZSM-5 decreased with Si/Al ratio, leading to the decline in reactant conversion, oil phase selectivity and quality. Meanwhile, the polymerization between monocyclic aromatic hydrocarbons and oxygenates was promoted to produce many polycyclic aromatic hydrocarbons and even coke, causing catalyst deactivation.

关键词: Biomass, Biofuel, Co-cracking, Catalyst, Preparation method, Si/Al ratio

Abstract: The catalytic cracking of bio-oil is important to produce aromatic hydrocarbons, which can partially replace gasoline or diesel to greatly reduce carbon emissions from transportation. To further promote the formation of aromatic hydrocarbons, this work studied the effects of the preparation method and the acid strength of Ga2O3/HZSM-5 on catalytic cracking of the bio-oil distilled fraction systematically. The preparation method of Ga2O3/HZSM-5 had an important effect on its catalytic activity: the Ga2O3/HZSM-5 prepared by physical mixing showed the low dispersion of active phases and poor pore structure, resulting in its insufficient activity and severe coke deposition; the Ga2O3/HZSM-5 prepared by precipitation exhibited the higher activity, while many polycyclic aromatic hydrocarbons unfavorable for the subsequent utilization were in the oil phase; the Ga2O3/HZSM-5 prepared by impregnation showed the highest activity and 35.5% (mass) selectivity of the oil phase, including 80.3% monocyclic aromatic hydrocarbons and 12.0% polycyclic aromatic hydrocarbons. The Brønsted acidity of Ga2O3/HZSM-5 decreased with Si/Al ratio, leading to the decline in reactant conversion, oil phase selectivity and quality. Meanwhile, the polymerization between monocyclic aromatic hydrocarbons and oxygenates was promoted to produce many polycyclic aromatic hydrocarbons and even coke, causing catalyst deactivation.

Key words: Biomass, Biofuel, Co-cracking, Catalyst, Preparation method, Si/Al ratio