Abstract
We have found that the treatment of KL zeolite with chlorotrifluoromethane (CF 3Cl) increased the catalytic activity for the aromatization of C 6 feedstock. Regeneration of the used platinum catalyst supported on the CF 3Cl-treated KL zeolite (Pt/FKL) was studied. Deactivation of the Pt/FKL was caused by sintering of the platinum particles, loss of halogen atoms and coke formation during aromatization of the C 6 feedstock. It was found that the catalyst performance of the Pt/FKL was restored by decoking in flowing 0.005% CCl 4+2% O 2+97.995% N 2from room temperature to 773 K, followed by treatment in flowing 0.8% freon 112+10% O 2+89.2% N 2at 773 K. From the results of the IR spectra of chemisorbed CO and terminal OH groups, it is suggested that the most important goal of regenerating the used Pt/FKL is to redisperse the platinum particles and restore their electronic state.
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