Process for preparing platinum-tin reforming catalysts and use thereof

Claim 2

A PROCESS FOR PREPARING A HYDROCARBON CONVERSION CATALYST COMPRISING A COMPLEX COMPOUND OF A PLATINUM GROUP METAL COMPONENT AND A TIN COMPONENT CONTAINED ON A REFRACTORY INORGANIC OXIDE CARRIER WHICH COMPRISES: A. IMPREGNATING SAID REFRACTORY INORGANIC OXIDE CARRIER WITH AN AQUEOUS SOLUTION OF A HALOGEN ACID CONTAINING A PLATINUM GROUP METAL COMPONENT; B. DRYING THE PLATINUM GROUP METAL COMPONENT IMPREGNATED CARRIER; C. IMPREGNATING THE DRIED PLATINUM GROUP METAL COMPONENTIMPREGNATED CARRIER WITH A SOLUTION OF A DIVALENT TIN COMPOUND, SAID IMPREGNATION CONDUCTED IN A NON-OXIDIZING AND NON-REDUCING ATMOSPHERE; D. DRYING THE CARRIER IMPREGNATED WITH SAID PLATINUM GROUP COMPONENT AND TI COMPONENT; AND E. CALCINING THE DRIED IMPREGNATE OF STEP (D) AT ELEVATED TEMPERATURES.

Claim 3

The process of claim 1 wherein said divalent tin component is stannous chloride.

Claim 4

The process of claim 1 wherein said aqueous solUtion employed in step (a) contains hydrochloric acid.

Claim 5

The process of claim 1 wherein said platinum group metal component employed in step (a) is chloroplatinic acid.

Claim 6

The process of claim 1 wherein said solution employed in step (c) in an aliphatic alcohol solution.

Claim 7

The process of claim 1 wherein said carrier is alumina.

Claim 8

The process for preparing a hydrocarbon conversion catalyst comprising a complex compound of a platinum component and stannous chloride contained on alumina which comprises: a. impregnating the said alumina with an aqueous solution of hydrochloric acid containing a platinum component; b. drying said platinum component-alumina impregnate; c. impregnating the dried platinum componentalumina impregnate with a solution of stannous chloride in a non-oxidizing and non-reducing atmosphere; d. drying the impregnate from step (c); and e. calcining said dried impregnate from step (d) by heating the same at a temperature varying from 400* to about 700*C.

Claim 9

The process for preparing a hydrocarbon conversion catalyst comprising a complex compound of a platinum component and stannous chloride contained on alumina which comprises: a. impregnating the said alumina with an aqueous solution of hydrochloric acid containing a platinum component; b. drying said platinum component-alumina impregnate; c. impregnating the dried platinum componentalumina impregnate with a solution of stannous chloride in a non-oxidizing and non-reducing atmosphere; d. drying the impregnate from step (c); and e. calcining said dried impregnate from step (d) by heating the same at a temperature varying from 400* to about 700*C.

Claim 10

An improved hydrocarbon conversion catalyst comprising a complex compound of a platinum group component and a tin component contained on a refractory inorganic oxide carrier, said catalyst prepared by a process comprising: a. impregnating said refractory inorganic oxide carrier with an aqueous solution of a halogen acid containing a platinum group metal component; b. drying the platinum group metal componentimpregnated carrier; c. impregnating the dried platinum group metal component-impregnated carrier with a solution of a divalent tin compound, said impregnation conducted in a non-oxidizing and non-reducing atmosphere; and d. drying the carrier impregnated with said platinum group component and tin component; and (e) calcining the dried impregnate of step (d) at elevated temperatures.

Claim 11

An improved hydrocarbon conversion catalyst comprising a complex compound of a platinum group component and a tin component contained on a refractory inorganic oxide carrier, said catalyst prepared by a process comprising: a. impregnating said refractory inorganic oxide carrier with an aqueous solution of a halogen acid containing a platinum group metal component; b. drying the platinum group metal componentimpregnated carrier; c. impregnating the dried platinum group metal component-impregnated carrier with a solution of a divalent tin compound, said impregnation conducted in a non-oxidizing and non-reducing atmosphere; and d. drying the carrier impregnated with said platinum group component and tin component; and (e) calcining the dried impregnate of step (d) at elevated temperatures.

Claim 12

A naphtha reforming process which comprises contacting a naphtha feed stock and hydrogen under reforming conditions with a catalyst comprising a complex compound of a platinum group metal component and a tin component contained on a refractory inorganic oxide carrier, said catalyst prepared by the method comprising: a. impregnating said refractory inorganic oxide carrier with an aqueous solution of halogen acid containing a platinum group metal component; b. drying the platinum group metal componentimpregnated carrier; c. impregnating the dried platinum group metal component-impregnated carrier with a solution of a divalent tin compound, said impregnation conducted in a non-oxidizing and non-reducing atmosphere; and d. drying the carrier impregnated with said platinum group component and tin component; and e. calcining the dried impregnate of step (d) at elevated temperatures.

Claim 13

A naphtha reforming process which comprises contacting a naphtha feed stock and hydrogen under reforming conditions with a catalyst comprising a complex compound of a platinum group metal component and a tin component contained on a refractory inorganic oxide carrier, said catalyst prepared by the method comprising: a. impregnating said refractory inorganic oxide carrier with an aqueous solution of halogen acid containing a platinum group metal component; b. drying the platinum group metal componentimpregnated carrier; c. impregnating the dried platinum group metal component-impregnated carrier with a solution of a divalent tin compound, said impregnation conducted in a non-oxidizing and non-reducing atmosphere; and d. drying the carrier impregnated with said platinum group component and tin component; and e. calcining the dried impregnate of step (d) at elevated temperatures.