Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
123 words
In a selectively sulfided catalytic composite comprising a halogenated porous material containing on an elemental basis about 0.01 to about 2 wt. % platinum group metal, about 0.01 to about 2 wt. % rhenium, and about 0.1 to about 3.5 wt. % halogen; wherein the platinum group metal and rhenium are uniformly dispersed throughout said halogenated porous material; wherein substantially all of said platinum group metal is present in the elemental metallic state; wherein said composite contains sulfur in an amount at least sufficient to provide an atomic ratio of sulfur to rhenium of about 0.5:1 so that a substantial portion of the rhenium is maintained in a sulfided state the improvement, which comprises the presence of Ziegler alumina as said porous material.
Claim 2
Dependent Claim
123 words
In a selectively sulfided catalytic composite comprising a halogenated porous material containing on an elemental basis about 0.01 to about 2 wt. % platinum group metal, about 0.01 to about 2 wt. % rhenium, and about 0.1 to about 3.5 wt. % halogen; wherein the platinum group metal and rhenium are uniformly dispersed throughout said halogenated porous material; wherein substantially all of said platinum group metal is present in the elemental metallic state; wherein said composite contains sulfur in an amount at least sufficient to provide an atomic ratio of sulfur to rhenium of about 0.5:1 so that a substantial portion of the rhenium is maintained in a sulfided state the improvement, which comprises the presence of Ziegler alumina as said porous material.
Claim 3
Dependent Claim
18 words
A selectively sulfided acidic catalytic composite as defined in claim 1 wherein the platinum group metal is platinum.
Claim 4
Dependent Claim
18 words
A selectively sulfided acidic catalytic composite as defined in claim 1 wherein the platinum group metal is iridium.
Claim 5
Dependent Claim
18 words
A selectively sulfided acidic catalytic composite as defined in claim 1 wherein the platinum group metal is rhodium.
Claim 6
Dependent Claim
16 words
A selectively sulfided acidic catalytic composite as defined in claim 1 wherein the halogen is chlorine.
Claim 7
Dependent Claim
79 words
A selectively sulfided acidic catalytic composite as defined in claim 1 wherein the catalytic composite is selectively sulfided after substantially all of the platinum group metal and rhenium contained therein are reduced to the elemental metallic state by contacting the reduced catalytic composite with a sulfiding reagent in an amount and under conditions selected to convert a substantial portion of the rhenium to the sulfided state while maintaining substantially all of the platinum group metal in the elemental state.
Claim 8
Dependent Claim
167 words
A selectively sulfided acidic catalytic composite as defined in claim 1 wherein the selectively sulfided acidic catalytic composite is prepared by the steps of: (a) forming a composite comprising a combination of the specified amounts of platinum group metal, rhenium and halogen with the Ziegler alumina carrier material in which substantially all of the platinum group metal and rhenium are present in the corresponding oxide form; (b) subjecting the resulting oxidized catalytic composite to reduction conditions effective to reduce substantially all of the platinum group and rhenium components to the corresponding elemental metallic state; (c) sulfiding the resulting reduced composite by contacting same with a sulfiding reagent in an amount and under conditions at least sufficient to convert a substantial portion of the rhenium component and of the platinum group component to the corresponding sulfided state; and thereafter, (d) stripping substantially all of the sulfide from the platinum group component resulting from step (c), while maintaining a substantial portion of the rhenium component in a sulfided state.
Claim 9
Dependent Claim
68 words
A selectively sulfided acidic catalytic composite as defined in claim 1 wherein the composite contains about 0.05 to about 1 wt. % platinum group metal, about 0.05 to about 1 wt. % rhenium, and about 0.5 to about 1.5 wt. % halogen and wherein sulfur is present therein in an amount sufficient to result in an atomic ratio of sulfur to rhenium of about 0.5:1 to about 1.5:1.