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Catalytic pyrolysis of corn straw for deoxygenation of bio-oil with different types of catalysts

  • Environmental Engineering
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Abstract

Corn straw can be converted to bio-oil through pyrolysis. However, the application of bio-oil is severely restricted due to the high content of oxygen. Catalytic pyrolysis is an available way for deoxygenation of bio-oil, and the deoxygenation reactions are strongly dependent on the type of catalyst. Whereas, the correlation between the deoxy-genated products and the catalyst types is still far from clear. In this work, the migration of O in the pyrolysis process was investigated, and eight catalysts were screened for deoxygenation of bio-oil, with a lab-scale fixed-bed reactor. The results showed that with the increase of pyrolysis temperature, the content of O in bio-oil decreased below 400 °C and then became stable and finally increased rapidly after 550 °C, indicating that the range of 400–550 °C was the proper temperature for deoxygenation. Eight catalysts (ZSM-5, SAPO-34, ZnO, MgO, δ-Al2O3, γ-Al2O3, acidified-α-Al2O3 and acidified-γ-Al2O3) were tested, and it was found that a higher alkalinity of catalyst was favorable for decarboxylation of bio-oil with more produced CO2, while a higher acidity was promoted the decrease of alcohols and carbonyls with more generation of H2O and/or CO. MgO was judged as the optimal catalyst for deoxygenation of bio-oil. The quality of bio-oil under the catalysis of MgO was best, with higher H/C and lower O/C.

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Acknowledgements

We acknowledge financial support by the National Key R&D Program of China (2019YFC1906700).

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Authors and Affiliations

  1. State Key Laboratory of Multi-Phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China

    Wenkai Zhang, Ze Wang, Wenli Song, Songgeng Li & Rui Ma

  2. Sino-Danish College, University of Chinese Academy of Sciences/Sino-Danish Center for Education and Research, Beijing, 100190, China

    Wenkai Zhang, Ze Wang, Wenli Song & Songgeng Li

  3. Petrochina CoalBed Methane Company Limited, 100028, China, Beijing

    Tengze Ge

  4. Yunnan Water Investment Company Limited, Kunming, 650106, China

    Cuiguang Yang

Authors
  1. Wenkai Zhang
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  2. Ze Wang
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  4. Cuiguang Yang
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  5. Wenli Song
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Correspondence to Ze Wang.

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Zhang, W., Wang, Z., Ge, T. et al. Catalytic pyrolysis of corn straw for deoxygenation of bio-oil with different types of catalysts. Korean J. Chem. Eng. 39, 1240–1247 (2022). https://doi.org/10.1007/s11814-021-1018-7

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  • DOI: https://doi.org/10.1007/s11814-021-1018-7

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