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

        Wenkai Zhang,Ze Wang,Tengze Ge,Cuiguang Yang,Wenli Song,Songgeng Li,Rui Ma 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.5

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

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