TY - JOUR
T1 - Shape-selective hydrogenation of naphthalene over zeolite-supported Pt and Pd catalysts
AU - Schmitz, Andrew D.
AU - Bowers, Grainne
AU - Song, Chunshan
PY - 1996/9/5
Y1 - 1996/9/5
N2 - Zeolite-supported Pt and Pd catalysts were used to effect naphthalene hydrogenation with high trans/cis decahydronaphthalene (DeHN) isomer selectivity. Four zeolites were studied: three hydrogen-mordenites (HM) with different SiO2/Al2O3 ratios (17, 21 and 38) and HY (SiO2/Al2O3 of 5.0). Catalytic selectivity was found to depend on both the metal and the zeolite. Consequently, the catalyst composition could be tailored for selective production of either cis-DeHN or trans-DeHN. For example, Pt/HY showed especially high selectivity (80%) for cis-DeHN and unlike all other catalysts tested, did not promote the isomerization of di-DeHN. On the other hand, equilibrium between the DeHN isomers was achieved with Pd/HM21, giving ca. 93% trans-DeHN at 200°C. In general, Pd catalysts showed higher initial selectivity for trans-DeHN than Pt catalysts. Also, the isomerization of cis-DeHN to trans-DeHN was more rapid on Pd catalysts. Selectivity for trans-DeHN increased with the fraction of weak acid sites on the zeolite (measured gravimetrically, using TPD of n-butylamine). No correlation between metal crystallite sizes (determined from XRD line-broadening) and DeHN isomer selectivity was found.
AB - Zeolite-supported Pt and Pd catalysts were used to effect naphthalene hydrogenation with high trans/cis decahydronaphthalene (DeHN) isomer selectivity. Four zeolites were studied: three hydrogen-mordenites (HM) with different SiO2/Al2O3 ratios (17, 21 and 38) and HY (SiO2/Al2O3 of 5.0). Catalytic selectivity was found to depend on both the metal and the zeolite. Consequently, the catalyst composition could be tailored for selective production of either cis-DeHN or trans-DeHN. For example, Pt/HY showed especially high selectivity (80%) for cis-DeHN and unlike all other catalysts tested, did not promote the isomerization of di-DeHN. On the other hand, equilibrium between the DeHN isomers was achieved with Pd/HM21, giving ca. 93% trans-DeHN at 200°C. In general, Pd catalysts showed higher initial selectivity for trans-DeHN than Pt catalysts. Also, the isomerization of cis-DeHN to trans-DeHN was more rapid on Pd catalysts. Selectivity for trans-DeHN increased with the fraction of weak acid sites on the zeolite (measured gravimetrically, using TPD of n-butylamine). No correlation between metal crystallite sizes (determined from XRD line-broadening) and DeHN isomer selectivity was found.
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U2 - 10.1016/0920-5861(96)00033-8
DO - 10.1016/0920-5861(96)00033-8
M3 - Article
AN - SCOPUS:0003062292
SN - 0920-5861
VL - 31
SP - 45
EP - 56
JO - Catalysis Today
JF - Catalysis Today
IS - 1-2
ER -