Characterization and catalytic performance of the platinum KL zeolite treated with chlorotrifluoromethane
1993; Elsevier BV; Volume: 106; Issue: 1 Linguagem: Inglês
10.1016/0926-860x(93)80153-h
ISSN1873-3875
AutoresMichio Sugimoto, Hisashi Katsuno, Toshiaki Hayasaka, Ken-ichi Hirasawa, Norio Ishikawa,
Tópico(s)Advanced Chemical Physics Studies
ResumoThe catalytic and physical properties of platinum KL zeolite treated with chlorotrifluoromethane (CF3Cl) were studied. In the aromatization of C6 feedstock, the platinum catalyst supported on the CF3Cl-treated KL zeolite (Pt/FKL) exhibits a high stability and a low carbon accumulation rate even at a low H2/C6 mole ratio of 0.5 and a high aromatization activity, compared with the untreated catalyst (Pt/KL). Due to the high aromatization rate, the Pt/FKL is able to attain the same aromatics yield at a lower reaction temperature than the Pt/KL. This fact is one of the reasons why the Pt/FKL shows a low carbon accumulation rate and high stability, even at such a low H2/C6 mole ratio. The results of129Xe nuclear magnetic resonance show that most of the platinum particles on both the Pt/FKL and Pt/KL used in this study are located on the external surfaces. This fact suggests that deactivation caused by channel blocking of carbonaceous products is not significant in these catalysts.
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