Role of Re and S in the Pt-Re-S/Al/sub 2/O/sub 3/ catalyst
The modifications in catalytic activity, selectivity, and stability when a Pt/Al/sub 2/O/sub 3/ catalyst is promoted by Re and/or S is studied following several C/sub 6/ hydrocarbons reforming. A bifunctional reaction scheme, showing modifications from those previously proposed, is introduced in order to interpret the results. Even the catalyst properties of Pt-Re are not the sum of the ones of Pt and Re, Pt-Re has properties brought by Pt and by Re. The addition of Re and S modifies the hydrogenolysis-dehydrogenation capacity of Pt. Re decreases the dehydrogenating capacity of Pt, reducing coke formation (desired effect) and increasing the formation of lower molecular weight paraffins by hydrogenolysis (undesired effect). The undesired contribution of Re is partially suppressed by the addition of S, that decreases the hydrogenolytic capacity of Pt-Re and increases the production of benzene and coke. This opposite action of Re and S on Pt can be related to the opposite electronic transfers, from Re to Pt and from Pt to S. Both geometrical and electronic effects influence the changes in selectivity.
- Research Organization:
- Instituto de Investigaciones en Catalisis y Petroquimica (INCAPE), Sante Fe (Argentina)
- OSTI ID:
- 5217311
- Journal Information:
- J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 99:1; ISSN JCTLA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020400 -- Petroleum-- Processing
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKANES
CATALYSIS
CATALYSTS
CATALYTIC EFFECTS
CATALYTIC REFORMING
CHEMICAL REACTIONS
COAL TAR OILS
COKE
CONTROL
DEHYDROGENATION
DEPOSITION
DISTILLATES
ELEMENTS
ENERGY SOURCES
FOSSIL FUELS
FUELS
HYDROCARBONS
METALS
MOLECULAR WEIGHT
NAPHTHA
NONMETALS
OILS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
PETROLEUM
PETROLEUM DISTILLATES
PETROLEUM FRACTIONS
PLATINUM
PLATINUM METALS
PROMOTERS
REFORMER PROCESSES
RHENIUM
SULFUR
SYNTHESIS
TRANSITION ELEMENTS