Acetonylacetone conversion on AlPO4-cesium oxide (5-30 wt%) catalysts

Acetonylacetone underwent both acid- and base-catalyzed intramolecular cycl izations to 2,5-dimethylfuran and 3-methyl-2-cyclopenten-1-one, respectivel y, on pure AlPO4, whereas its modification with increasing amounts of cesiu m oxide developed AlPO4-based materials with increased basic properties and , hence, higher selectivities to the base-catalyzed cyclization process. Ho wever, the poisoning of surface acid and base sites indicated that acetonyl acetone conversion into 3-methyl-2-cyclopenten-1-one can also be attributed to the joint participation of surface acid and base sites. So, acetonylace tone cannot be used for the simultaneous characterization of acidic and bas ic surface properties of acid-base heterogeneous catalysts.