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US 5,668,074 AGranted
Preparation of catalysts for alkane/cycloalkane isomerization
AssigneePhillips Petroleum Company
InventorsAn-hsiang Wu, Charles A. Drake
Life of this patent
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Abstract
A material which is effective as a catalyst for isomerizing alkanes and/or cycloalkanes is prepared by a method which comprises incorporating Nb and/or Ta into a reduced material comprising Pt and/or Pd on alumina, followed by heating in a non-reducing gas and heat-treatment with at least one fluoroalkane and/or chlorofluroalkane (preferably CClF.sub.3).
Claims20
A method of preparing a composition of matter comprising the steps of:
- (a) treating a starting material which comprises (i) at least one compound of at least one Group VIII noble metal selected from the group consisting of platinum and palladium and (ii) alumina as the support material with a reducing gas at a temperature of about 300.degree.-600.degree. C. for a time period of at least about 10 minutes;
- (b) incorporating into the reduced material obtained in step (a) at least one compound of at least one Group VB metal selected from the group consisting of niobium and tantalum;
- (c) heating the material obtained in step (b) in a non-reducing gas at a temperature of about 300.degree.-500.degree. C. for a time period of at least about 10 minutes;
- and
- (d) treating the material obtained in step (c) with at least one halocarbon compound selected from the group consisting of fluoroalkanes and chlorofluoroalkanes at a temperature of about 200.degree.-500.degree. C. for a time period of at least about 10 minutes.
2 more elements
Dependencies are inferred from the claim text.