Stabilized reforming catalyst
AssigneeAtlantic Richfield Company
InventorsMarvin F. L. Johnson, Elmer W. Breder, Jr.
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Abstract
Thermal stability of a halide-promoted, supported noble metal reforming catalyst is improved by employing a modified alumina support whose alumina precusor comprises at least about 75 weight percent boehmite, having an average crystallite diameter no greater than about 60 Angstroms. The thermal stability of the support is improved by the inclusion of a minor amount of silica, preferably added as a low-sodium colloidal silica dispersion to a mull of alumina prior to its extrusion and calcination.
Claims6
The process for reforming a naphtha fraction which comprises contacting the naphtha fraction under reforming conditions and in the presence of hydrogen with a reforming catalyst comprising a modified alumina support, derived from an alumina precursor, having distributed thereon from about 0.3 to about 1.0 weight percent platinum, from about 0.3 to about 1.0 weight percent rhenium, and from about 0.5 to about 2.0 weight percent chloride, wherein the modified alumina support precursor comprises at least about 75 weight percent boehmite, having an average crystallite diameter no greater than about 60 Angstroms, and the modified alumina support additionally comprises from about 0.25 about 5.0 weight percent silica, the silica having been added to the boehmite-containing alumina as an aqueous colloidal dispersion.
Dependencies are inferred from the claim text.