Process for the preparation of a paraffin isomerization catalyst

Abstract

Process for preparation of a paraffin isomerization catalyst comprising a mixture of a Group IVB metal oxide, a Group VIB metal oxide, a Group IIIA metal oxide and a Group VIII metal, said process comprising the steps of (a) contacting a hydroxide of the Group IVB metal with an aqueous solution of an oxyanion of the Group VIB metal to provide a mixture, (b) drying the mixture to provide a dry powder, (c) kneading the dry powder with a Group IIIA hydroxide gel to form a paste, (d) shaping the paste to form a shaped material, (e) calcining the shaped material, (f) impregnating the calcined material with an aqueous solution of a Group VIII metal salt to provide the catalyst, (g) calcining the catalyst.

1 . Process for preparation of a paraffin isomerization catalyst comprising a mixture of a Group IVB metal oxide, a Group VIB metal oxide, a Group IIIA metal oxide and a Group VIII metal, said process comprising the steps of 
 (a) contacting a hydroxide of the Group IVB metal with an aqueous solution of an oxyanion of the Group VIB metal to provide a mixture,    (b) drying the mixture to provide a dry powder,    (c) kneading the dry powder with a Group IIIA hydroxide gel to form a paste,    (d) shaping the paste to form a shaped material,    (e) calcining the shaped material,    (f) impregnating the calcined material with an aqueous solution of a Group VIII metal salt to provide the catalyst,    (g) calcining the catalyst.    
   
   
       2 . Process according to  claim 1 , wherein the dry powder is calcined before kneading.  
   
   
       3 . Process according to  claim 1 , wherein the Group IVB metal is zirconium, the Group VIB metal is tungsten and the Group III A metal is aluminum.  
   
   
       4 . Process according to  claim 3 , wherein the catalyst comprises tungsten oxide, aluminium oxide, zirconium oxide and the Group VIII metal.  
   
   
       5 . Process according to  claim 4 , wherein the catalyst in its dry form comprises 10-50 wt % tungsten oxide, 10-40 wt % aluminium oxide and a remainder of zirconium oxide and the Group VIII metal.  
   
   
       6 . Process according to  claim 1 , wherein the Group VIII metal is palladium and/or platinum in an amount of 0.01-5 wt %.  
   
   
       7 . Process according to  claim 1 , wherein the mixture is dried by spray drying and the paste is shaped by extrusion to provide an extrudate.  
   
   
       8 . Method for the production of high-octane gasoline from a hydrocarbon feedstock comprising C 5+  hydrocarbon cuts, wherein the feedstock is contacted with a paraffin isomerization catalyst prepared according to  claim 1 .  
   
   
       9 . Method according to  claim 8  wherein the hydrocarbon feedstock comprises C 7+  hydrocarbon cuts or cuts containing this fraction.