Process for preparing platinum-tin reforming catalyst and use thereof

Abstract

Supported platinum group metal-tin hydrocarbon conversion catalysts are prepared by (1) impregnating a refractory inorganic oxide support with an aqueous solution of a halogen acid containing a platinum group metal component; (2) drying the platinum group metal impregnated carrier; (3) impregnating the dried platinum group metal impregnate with a solution of a divalent tin compound in a non-oxidizing and non-reducing atmosphere; and (4) drying the resulting impregnate.

What is claimed is: 
     
       1. 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 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;   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.   
     
     
       2. The process of claim 1 wherein said divalent tin component is stannous chloride. 
     
     
       3. The process of claim 1 wherein said aqueous solution employed in step (a) contains hydrochloric acid. 
     
     
       4. The process of claim 1 wherein said platinum group metal component employed in step (a) is chloroplatinic acid. 
     
     
       5. The process of claim 1 wherein said solution employed in step (c) in an aliphatic alcohol solution. 
     
     
       6. The process of claim 1 wherein said carrier is alumina. 
     
     
       7. 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.   
     
     
       8. 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.   
     
     
       9. 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.