Ex parte BERTUS et al. - Page 2




          Appeal No. 1999-1252                                                        
          Application No. 08/648,520                                                  

               The subject matter on appeal relates to a process which                
          includes the step of contacting a regenerated catalyst with a               
          reducing gas under conditions suitable for countering effects               
          of contaminating metals thereon.  This appealed subject matter              
          is adequately illustrated by independent claim 1 and                        
          independent claim 35 which read as follows:                                 
               1. In a process for the catalytic cracking of a                        
          hydrocarbon feed wherein said feed is contacted with a                      
          crystalline zeolite aluminosilicate cracking catalyst                       
          containing at least one contaminating metal selected from the               
          group consisting of nickel, vanadium, and iron under cracking               
          conditions and at least a portion of said cracking catalyst is              
          periodically regenerated by contact with a combustion                       
          supporting gas under regeneration conditions and at least a                 
          portion of the regenerated catalyst is employed in the                      
          catalytic cracking of hydrocarbon feed, the improvement                     
          consisting essentially of contacting at least a portion of                  
          said regenerated catalyst with a reducing gas under conditions              
          suitable for countering effects of contaminating metals                     
          thereon to produce a passivated catalyst and employing at                   
          least a portion of said [reduced] passivated catalyst in                    
          cracking said hydrocarbon feed.                                             
          35. A process for the cracking of a hydrocarbon feedstock                   
          comprising contacting said feedstock under cracking conditions              
          in a cracking zone with a cracking catalyst prepared by (1)                 
          starting with a contaminated cracking catalyst comprising                   
          crystalline zeolite alumino-silicate wherein said contaminants              
          comprise carbon and at least one metal contaminant selected                 
          from the group consisting of nickel, vanadium, and iron, (2)                
          exposing said contaminated cracking catalyst in an oxidation                
          step to a combustion-supporting gas under conditions                        
          sufficient to result in combustion of carbon contaminant, and               
          (3) then exposing the resulting catalyst in a reduction step                
          to a reducing gas under conditions suitable for countering                  
          adverse effects of said contaminating metals.                               
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