Selective conversion of bio-oil to light olefins: Controlling catalytic cracking for maximum olefins

► Light olefins are the key and basic feedstock for petrochemical industry. ► Selective production of olefins from bio-oil realized by La-modified zeolite. ► The olefins yield from bio-oil is close to the level from methanol. ► The olefins yield from bio-oil is about 85% of the theoretical yield. ► Increasing medium acid sites enhance olefin selectivity and suppress coke formation.