Zeolite-catalyzed conformational isomerization of cis-decahydronaphthalene reaction pathways and kinetics

Conference · Sun Dec 31 04:00:00 EST 1995

OSTI ID:214805

Lai, W C; Song, C ^[1]

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1. Pennsylvania State Univ., University Park, PA (United States)

We have previously shown that cis-decalin is much more stable than cis-decalin, and the former also has the ability of inhibiting the solid deposit formation from jet fuels at high temperatures. It is desirable to convert cis-decalin to trans-decalin. This work presents some exploratory studies on the catalytic isomerization of cis-decalin to trans-decalin. The catalytic reactions were conducted at 200-275{degrees}C for 0.15-8 h under an initial pressure of 0.79-MPa N{sub 2} or H{sub 2} using the following catalysts: a hydrogen Y zeolite (HY), a metal ion-exchanged Y zeolite (LaHY), a hydrogen mordenite (HM38), and three noble metal loaded mordenites (PtHM38, PdHM38, and PtHM21). Pt- and Pd-loaded mordenites are very effective catalysts under H{sub 2} atmosphere for the isomerization reaction even at low temperature, 200{degrees}C; however, they are less effective under N{sub 2} atmosphere. HY, LaHY, and HM38 are much less effective than Pt- and Pd-loaded mordenites, and their performance was not affected by H{sub 2}. HY performs slightly better than LaHY in terms of activity and selectivity, and HM38 is the least effective one among the catalysts studied. Selectivity towards trans-decalin decreases with both increasing temperature and increasing conversion level (under isothermal condition). An overall kinetic model for the catalytic reaction was proposed and empirical equations were presented to predict the selectivity.

• OSTI ID: 214805
• Report Number(s): CONF-950801--
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
CATALYTIC EFFECTS
CHEMICAL REACTION KINETICS
DECALIN
ISOMERIZATION
JET ENGINE FUELS
MORDENITE
PALLADIUM
PLATINUM
SPECIFICITY
ZEOLITES