Reuse of waste catalytic‑cracking catalyst: fine performance in acetalization

摘要

Equilibrium fluid-catalytic-cracking catalyst (E-cat), a waste catalyst from fluid-catalytic cracking in petroleum refining,was used to catalyze acetalization of aldehydes (ketones) with diols. Although the activity of E-cat in catalytic cracking hasdecreased, it still presented fine catalytic performance in the acetalization. The ketal was stoichiometrically formed in thereaction of cyclohexanone with ethanediol, conversion of the ketone reached to 99.7% and selectivity of the ketal maintained100% in the optimum conditions. It was revealed that E-cat can be provided with the wide adaptability in acetalization fromthe syntheses of different kinds of acetals or ketals. Moreover, E-cat appeared a superreusability through filtration from thereaction flask. It was an attracted example for decrement from the bulk waste catalyst in petroleum refining.