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Some studies of PtRe on Y-Zeolite: Evidence of bimetallic interaction

Conference ·
OSTI ID:6144153
; ;
Modification of the metal function in industrial Pt/Al/sub 2/O/sub 3/ reforming catalyst led to the development of bimetallic catalysts such as PtRe/Al/sub 2/O/sub 3/. The presence of Re results in greater selectivity of the reaction to desired reformate products and in longer life of the catalyst. In the past very little work has been reported on the modification of Pt/Y with Re, although a few investigations of Re/Y and PtRe/L-Zeolite have recently appeared. Several points are worth noting from this study on the effect of the addition of Re to a Pt/Y-Zeolite bifunctional catalyst and can be summarized as follows: While Re/sub x/O/sub y/ reduces at a lower temperature on Y-Zeolite than on Al/sub 2/O/sub 3/ or SiO/sub 2/ suggesting a weaker metal-support interaction, Re/sub 2/O/sub 7/ does not sublime from the zeolite as it does from the amorphous supports under the same conditions. The Re is presumably trapped in the zeolite cages, perhaps as NaReO/sub 4/, where it has the best change of forming bimetallic clusters with the Pt; after reoxidation at 300/sup 0/C, there is no memory effect of the Re precursor in either the monometallic or bimetallic catalysts; some type of metal-metal interaction occurs in the zeolite, as the reduction of the Re is catalyzed by Pt. It is possible that two separate alloy phases are formed; and the selectivity and activity profiles of Pt/NaHY are altered considerably by the presence of Re. The metal function deactivates more rapidly than the acid function.
OSTI ID:
6144153
Report Number(s):
CONF-870323-
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360104 -- Metals & Alloys-- Physical Properties
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ACTIVATION ENERGY
ALLOYS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CATALYST SUPPORTS
CATALYTIC REFORMING
CHALCOGENIDES
CHEMICAL PROPERTIES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
ENERGY
HIGH TEMPERATURE
INORGANIC ION EXCHANGERS
INTERACTIONS
ION EXCHANGE
ION EXCHANGE MATERIALS
KINETICS
MATERIALS
MINERALS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PLATINUM ALLOYS
PLATINUM METAL ALLOYS
REACTION KINETICS
REFORMER PROCESSES
REFRACTORY METAL COMPOUNDS
RHENIUM ALLOYS
RHENIUM COMPOUNDS
RHENIUM OXIDES
SILICON COMPOUNDS
SILICON OXIDES
TRANSITION ELEMENT COMPOUNDS
ZEOLITES