Abstract: Aiming at the poor upgrading effect of heavy oil and easy coking, a new idea of biomass pyrolysis coupled with heavy oil upgrading was proposed, and the catalytic effect of the catalyst Fe₂O₃/Al₂O₃ on biomass (microcrystalline cellulose and waste paper) pyrolysis behavior was investigated. The results show that the yield of biomass pyrolysis bio-oil is increased and the viscosity of the modified heavy oil is further reduced by using Fe₂O₃/Al₂O₃ as a catalyst. Under the conditions of a catalyst mass fraction of 0.4%,a reaction temperature of 350 ℃ and a reaction time of 30 min, the yields of cellulose and waste paper pyrolysis bio-oil were 76.25% and 65.26%, respectively. For the two coupling systems of cellulose-heavy oil and waste paper scraps-heavy oil, the viscosity reduction rate of the upgraded heavy oil was reached 74.14% and 65.93%, respectively. The results of FT-IR and SARA analysis before and after upgrading showed that the heavy oil was deeply cracked, and the C—C bonds and C—S bonds were broken under the action of the active hydrogen and Fe₂O₃, to produce light components.

Key words: heavy oil upgrading, biomass, coupling, hydrogen donor