Microcalorimetric study of silica- and zeolite-supported platinum catalysts

Journal Article · Fri Jul 01 00:00:00 EDT 1994 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1006/jcat.1994.1201· OSTI ID:6798369

Sharma, S B; Dumesic, J A ^[1]; Miller, J T ^[2]

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1. Univ. of Wisconsin, Madison, WI (United States)
2. Amoco Oil Co., Naperville, IL (United States)

Microcalorimetric measurements of the differential heats of hydrogen and carbon monoxide adsorption versus adsorbate coverate were made at 403 K for platinum supported on silica, magnesia/alumina, L-zeolite, Y-zeolite, and ZSM-5. The differential heats at zero coverage for hydrogen and carbon monoxide adsorption were 90 and 140 kJ/mol, respectively, for platinum supported on silica and nonacidic zeolites. The differential heats were large by approximately 20 kJ/mol for hydrogen and carbon monoxide adsorption on platinum particles supported on basis supports such as potassium/silica, magnesia/alumina, and zeolites containing basic cations (K[sup +], Ba[sup 2+]) exchanged in excess of the zeolite framework aluminum content. The microcalorimetric results suggest that the high paraffin aromatization activity and selectivity observed for L-zeolite-supported platinum catalysts do not appear to be caused solely by changes in the adsorptive properties of the cluster-size platinum particles located within the zeolite. 35 refs., 10 figs., 2 tabs.

• OSTI ID: 6798369
• Journal Information: Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 148:1; ISSN 0021-9517; ISSN JCTLA5
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400 -- Petroleum-- Processing
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ABSORPTION HEAT
ALKALINE EARTH METAL COMPOUNDS
ALKANES
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
AROMATIZATION
CALORIMETRY
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYST SUPPORTS
CHALCOGENIDES
CHEMICAL REACTIONS
ELEMENTS
ENERGY
ENTHALPY
HEAT
HYDROCARBONS
HYDROGEN
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MATERIALS
METALS
MICROANALYSIS
MINERALS
NONMETALS
ORGANIC COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PLATINUM
PLATINUM METALS
SILICA
SILICATE MINERALS
SILICON COMPOUNDS
SILICON OXIDES
SORPTIVE PROPERTIES
SURFACE PROPERTIES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENTS
ZEOLITES