Abstract Dehydrogenatable hydrocarbons are dehydrogenated by contacting them, under dehydrogenation conditions, with a dehydrogenation catalyst comprising a combination of catalytically effective amounts of an alkali or alkaline earth component with a catalytic composite consisting essentially of a tin component in combination with a platinum component on a carrier material, wherein the catalytic composite is prepared by the method which comprises: (a) impregnating a high surface area porous carrier material with a solution of a complex chlorostannate (II) chloroplatinate anionic species, the solution being stabilized in contact with the carrier material with an aqueous halogen acid; and thereafter, (b) drying and calcining the impregnated carrier material. For the dehydrogenation of normal paraffin hydrocarbons, this dehydrogenation catalyst preferably contains, on an elemental basis, about 0.01 to about 2 wt. % platinum, about 0.01 to about 5 wt. % tin and about 0.01 to about 5 wt. % alkali or alkaline earth metal.
A method as defined in claim 1 wherein the porous carrier material is a refractory inorganic oxide.
Claim 2
Dependent Claim
18 words
A method as defined in claim 1 wherein the alkali or alkaline earth metal oxide is potassium oxide.
Claim 3
Dependent Claim
18 words
A method as defined in claim 1 wherein the alkali or alkaline earth metal oxide is lithium oxide.
Claim 4
Dependent Claim
29 words
A method as defined in claim 1 wherein the catalyst contains, on an elemental basis, about 0.01 to about 5 wt. % of the alkali or alkaline earth metal.
Claim 5
Dependent Claim
33 words
A method as defined in claim 1 wherein the catalytic composite contains, on an elemental basis, about 0.01 to about 5 wt. % tin and about 0.01 to about 2 wt. % platinum.
Claim 6
Dependent Claim
18 words
A method as defined in claim 1 wherein the anionic species is a complex trichlorostannate (II) chloroplatinate (IV).
Claim 7
Dependent Claim
18 words
A method as defined in claim 1 wherein the anionic species is a complex trichlorostannate (II) chloroplatinate (II).
Claim 8
Dependent Claim
13 words
A method as defined in claim 1 wherin the carrier material is alumina.
Claim 9
Dependent Claim
13 words
A method as defined in claim 1 wherein the carrier material is gamma-alumina.
Claim 10
Dependent Claim
24 words
A method as defined in claim 1 wherein the complex anionic species is the reaction product of stannous chloride and chloroplatinic acid in solution.
Claim 11
Dependent Claim
24 words
A method as defined in claim 1 wherein the solution is stabilized with aqueous hydrochloric acid at a pH of less than about 1.