DECANE REFORMING REACTION OVER PT, IR, PT-IR AND PT-NI BIMETALLIC CATALYSTS SUPPORTED ON Y-ZEOLITE

Pt, Ir, Pt-Ir and Pt-Ni bimetallic catalysts supported on NaY- and HY- zeolite were examined as a catalyst for producing gasoline from n-deca ne via simultaneous reforming and cracking. The catalysts were prepare d by calcining and reducing metal-ion-exchanged Y-zeolite with O-2 and H-2 at 300 degrees C, respectively. Thus prepared catalysts were char acterized by hydrogen chemisorption and temperature programmed desorpt ion of ammonia. Pt-Ni/NaY and Pr-Ir/NaY bimetallic catalysts offered t he improved activity maintenance compared to Pt/NaY monometallic catal yst. The catalysts supported on HY-zeolite showed higher selectivity t oward C-5-C-7 and skeletal isomers of C-5-C-7 and C-6-C-10 than those of the catalysts supported on NaY-zeolite, which is a desired characte ristic for increasing octane value of gasoline these days. However, de activation with reaction time was much more pronounced on HY-zeolite-s upported catalyst. When the catalyst was presulfided with H2S, the sta bility with time on stream was enhanced and the selectivity was quite different from that of the catalyst before presulfiding. The acidity o f Y-zeolite and presulfiding of catalyst greatly influenced the activi ty, selectivity and stability of Pt, Ir, Pt-Ir and Pt-Ni bimetallic ca talysts supported on Y-zeolite in n-decane reforming reaction.