Dehydrocyclization of C₆ Hydrocarbon with and Without Oxygen Containing Substituent over Pt/(Na)-Al₂O₃ Catalyst

The presence of hydroxyl or keto functional group affects both activity and selectivity for dehydrocyclization of C₆ hydrocarbon over Pt/(Na)-Al₂O₃ catalyst. Under similar reaction conditions, n-hexane produces benzene as the primary product (>40 %), whereas dehydration is a major reaction pathway for 2-hexanol and yields mainly hexenes (>70 %). However, 2-hexanone was found to be involved in a variety of reactions over Pt/(Na)-Al₂O₃ catalyst and produces lower hydrocarbons (C₂-C₅), 5-dodecanone, 2- And 5-nonanones, and 2-acetyl-3-propyl-2-cyclohexen-1-one. The presence of hydroxyl (-OH) or keto group (=C=O) at the C-2 position alters the interaction of C₆ hydrocarbon with the catalyst surface which eventually controls the overall product selectivity.