Dehydration of Pentanediol over CeO 2 , CeO 2 ‐Ga 2 O 3 , and CeO 2 ‐In 2 O 3
Muthu Kumaran GnanamaniGary JacobsWilson D. ShaferShelley D. HoppsBurtron H. Davis
Abstract
Abstract Conversion of bio‐oil from flash pyrolysis of biomass is a way to produce useful renewable feedstocks for the chemicals industry. Dehydration of pentanediol (1,5‐ and 2,4‐pentanediol) was investigated over CeO 2 , CeO 2 ‐Ga 2 O 3 , and CeO 2 ‐In 2 O 3 catalysts at 250–350 °C. Adding Ga or In (20 mol%) improved the conversion of pentanediol over CeO 2 , but adversely affected selectivity. In the base case, 1,5‐pentanediol was converted on CeO 2 to 4‐penten‐1‐ol and 1‐pentanol, desired linear alcohols, together with unwanted cyclopentanol and cyclopentanone byproducts. Adding gallium or indium to ceria increased the selectivity towards undesired cyclized products like tetrahydropyran and tetrahydropyran‐2‐one due to increased acidity. In the base case, 2,4‐pentanediol converted on CeO 2 to unsaturated alcohol (e. g., 3‐penten‐2‐ol > 74 % selectivity), but adding Ga or In promoted acid‐catalyzed cracking. Tuning the acid‐base characteristics of ceria significantly alters the product distribution.
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