Catalytic Transformation of Bio-oil to Olefins with Molecular Sieve Catalysts

Catalytic conversion of bio-oil into light olefins was performed by a series of molecular sieve catalysts, including HZSM_-5, MCM_-41, SAPO_-34 and Y_-zeolite. Based on the light olefins yield and its carbon selectivity, the production of light olefins decreased in the following order:HZSM_-5>SAPO_-34>MCM_-41>Y_-zeolite. The highest olefins yield from bio-oil using HZSM_-5 catalyst reached 0.22 kg/kg_bio-oil with carbon selectivity of 50.7% and a nearly complete bio-oil conversion. The reaction conditions and catalyst characterization were investigated in detail to reveal the relationship between the catalyst structure and the production of olefins. The comparison between the pyrolysis and catalytic pyrolysis of bio-oil was also performed.