Directional synthesis of liquid higher olefins through catalytic transformation of bio‐oil

Abstract

BACKGROUND: Catalytic transformation of bio-oil into higher olefins can provide valuable bio-fuels and chemicals used in the manufacture of high-octane gasoline, detergents, plasticizers and other petrochemicals. This work explores the production of higher olefins from bio-oil through catalytic cracking of bio-oil along with light olefins oligomerization. RESULTS: For bio-oil catalytic cracking, the olefins yield reached 43.8 C-mol% with near-complete bio-oil conversion. The oxygenated organic compounds in bio-oil go through deoxygenation, cracking and hydrogen transfer reactions and form light olefins over the zeolite acid sites. For the oligomerization of light olefins, the highest selectivity and yield of C 5+ olefins over the LTGO catalyst reached 85.4 C-mol% and 326.7 g kg −1 cata h −1 , respectively. Main products below 300 • C were C 6 = -C 12 = olefins, originating from light olefin oligomerization. The influences of the reaction conditions were investigated in detail, and the reaction mechanism was addressed.CONCLUSION: Bio-oil can be catalytically converted to C 2 = -C 4 = light olefins over HZSM-5, and further selectively transformed to C 5 + high olefins via the oligomerization of light olefins over LTGO. The transformation of bio-oil to higher olefins may be useful for the production of bio-fuels and high value chemicals using renewable biomass.

Recent research progress on bio‐oil conversion into bio‐fuels and raw chemicals: a review

“…This strategy includes the catalytic cracking of bio‐oil into light olefins and the subsequent synthesis of higher C 5+ olefins (two reactors in series). Directional synthesis of C 6 –C 12 olefins by C 2 –C 4 light olefin oligomerization over LTGO commercial catalyst was reported by Yuan et al . The light olefins yield reached 43.8 C‐mol% in the catalytic cracking step over HZSM‐5, with bio‐oil being completely converted.…”