Zeolite-based catalyst material, the preparation thereof and the use thereof for the selective dehydrogenation of n-butane

Abstract

A process in which a hydrocarbon feedstock containing n-butane is selectively dehydrogenated to a product containing butenes. A catalyst suitable for the selective dehydrogenation of a feedstock containing n-butane to provide a product containing butenes. A method for producing a catalyst suitable for the selective dehydrogenation of a feedstock containing n-butane to provide a product containing butenes.

That which is claimed is:  
     
         1 . A catalyst composition comprising: 
 (A) an titania-modified zeolite composition;    (B) platinum and    (C) tin.    
     
     
         2 . A catalyst according to  claim 1  wherein the titania-modified zeolite composition comprises an air dried mixture of LTL zeolite, aluminum hydroxychloride and Bentonite.  
     
     
         3 . A catalyst according to  claim 2  wherein the titania-modified zeolite composition comprises an air dried mixture of LTL zeolite, aluminum hydroxychloride and Bentonite to which a titanium organic compound has been added to provide a titanium-modified LTL zeolite composition.  
     
     
         4 . A catalyst according to  claim 3  wherein the titanium organic compound is titanium ethoxide.  
     
     
         5 . A catalyst according to  claim 3  wherein the titania-modified LTL zeolite composition comprises an air dried mixture of LTL zeolite, aluminum hydroxychloride and Bentonite to which a titanium organic compound has been added that has been calcined to provide a titania-modified LTL zeolite.  
     
     
         6 . A catalyst according to  claim 4  wherein the titania-modifled LTL zeolite composition comprises an air dried mixture of LTL zeolite, aluminum hydroxychloride and Bentonite to which a titanium organic compound has been added that has been calcined to provide a titania-modified LTL zeolite.  
     
     
         7 . A catalyst according to  claim 5  wherein the titania-modified LTL zeolite composition comprises a calcined air dried mixture of LTL zeolite, aluminum hydroxychloride and Bentonite to which a titanium organic compound has been added that has been further treated by impregnation with a platinum-tin impregnating solution to provide a titania-modified LTL zeolite composition impregnated with platinum and tin.  
     
     
         8 . A catalyst according to  claim 6  wherein the titania-modified LTL zeolite composition comprises a calcined air dried mixture of LTL zeolite, aluminum hydroxychloride and Bentonite to which a titanium organic compound has been added that has been further treated by impregnation with a platinum-tin impregnating solution to provide a titania-modified LTL zeolite composition impregnated with platinum and tin.  
     
     
         9 . A catalyst according to  claim 7  wherein the platinum-tin impregnating solution comprises chloroplatinic acid.  
     
     
         10 . A catalyst according to  claim 8  wherein the platinum-tin impregnating solution comprises chloroplatinic acid.  
     
     
         11 . A catalyst according to  claim 7  wherein the platinum-tin impregnating solution comprises tin chloride.  
     
     
         12 . A catalyst according to  claim 8  wherein the platinum-tin impregnating solution comprises tin chloride.  
     
     
         13 . A method for preparing a catalyst wherein the method comprises: 
 (A) admixing LTL zeolite, aluminum hydroxychloride and Bentonite to provide an LTL zeolite composition and    (B) calcining the LTL zeolite composition to provide a calcined LTL zeolite composition;    (C) adding titanium to the calcined LTL zeolite composition by impregnating with a titanium compound to provide a titanium-modified LTL zeolite composition;    (D) calcining the titanium-modified LTL zeolite composition to provide a titania-modified LTL zeolite composition and    (E) adding platinum and tin to the titania-modified LTL zeolite by impregnating the titania-modified LTL zeolite composition with a platinum-tin impregnating solution to provide a titania-modified LTL zeolite composition impregnated with platinum and tin.    
     
     
         14 . A method for preparing a catalyst according to  claim 13  wherein the titanium compound is chosen from the group consisting essentially of titanium halides, tetraalkyl titanates of the general formula Ti(OR) 4  wherein each R is an alkyl group, titanium methoxide and titanium ethoxide.  
     
     
         15 . A method for preparing a catalyst according to  claim 14  wherein the titanium compound is titanium ethoxide.  
     
     
         16 . A method for preparing a catalyst according to  claim 14  wherein the platinum compound is chosen from the group consisting essentially of chloroplatinic acid, platinic chloride, platinum bromide, platinum iodide, tetramine platinum chloride, tetramine platinum nitrate, tetramine platinum hydroxide, tetrachlorodiamine platinum and combinations of any two or more thereof and the tin compound is chosen from the group consisting essentially of stannous acetate, stannic acetate, stannous bromide, stannic bromide, stannous chloride, stannic chloride, stannous oxalate, stannous sulfate, stannic sulfate, stannous sulfide and combinations of any two or more thereof.  
     
     
         17 . A method for preparing a catalyst according to  claim 16  wherein the platinum compound is chloroplatinic acid.  
     
     
         18 . A method for preparing a catalyst according to  claim 16  wherein the tin compound is stannous chloride.  
     
     
         19 . A method for preparing a catalyst according to  claim 16  wherein the platinum compound is chloroplatinic acid and the tin compound is stannous chloride.  
     
     
         20 . A method for dehydrogenating n-butane to butenes comprising contacting n-butane with a catalyst prepared by the method of  claim 13  under conditions for the production of butenes.  
     
     
         21 . A method for dehydrogenating n-butane to butenes comprising contacting n-butane with a catalyst prepared by the method of  claim 14  under conditions for the production of butenes.  
     
     
         22 . A method for dehydrogenating n-butane to butenes comprising contacting n-butane with a catalyst prepared by the method of  claim 15  under conditions for the production of butenes.  
     
     
         23 . A method for dehydrogenating n-butane to butenes comprising contacting n-butane with a catalyst prepared by the method of  claim 16  under conditions for the production of butenes.  
     
     
         24 . A method for dehydrogenating n-butane to butenes comprising contacting n-butane with a catalyst prepared by the method of  claim 17  under conditions for the production of butenes.  
     
     
         25 . A method for dehydrogenating n-butane to butenes comprising contacting n-butane with a catalyst prepared by the method of  claim 18  under conditions for the production of butenes.  
     
     
         26 . A method for dehydrogenating n-butane to butenes comprising contacting n-butane with a catalyst prepared by the method of  claim 19  under conditions for the production of butenes.