The study of hydrothermal liquefaction of corn straw with Nano ferrite + inorganic base catalyst system at low temperature

Abstract

Hydrothermal liquefaction of corn straw with different catalytic systems and temperatures were investigated in this study. Results showed dual catalytic system can effectively promote the degradation of corn straw at low temperature. With increase of temperature, aqueous phase increased and straw residue decreased for all catalytic systems. The heavy bio-oil yield increased with the increasing of temperature for single catalytic system, while the trend was opposite for dual catalytic system. In single catalytic system, ZnFe₂O₄ was more suitable for preparation of heavy bio-oil, and the maximum yield reached 34.02 wt% at 180 °C. The proportion of monophenyl compounds in heavy bio-oil for dual catalytic system reached the maximum of 84% at 220 °C with ZnFe₂O₄. At 180 °C, the contents of Benzofuran,2,3-dihydro and 2-Methoxy-4-vinylphenol reached the maximum of 31.42% and 17.64% in CoFe₂O₄ catalyst system, and the maximum yield of Vanillin was 10.82% with ZnFe₂O₄.

Keywords: Catalytic system; Corn straw; Hydrothermal liquefaction; Monophenyl compounds.