Hydroprocessing FCC naphthas

Abstract

The hydrodesulfurization of a hydrocarbon feedstock contains an olefinic component achieved with increased selectivity for hydrodesulfurization by contacting the feedstock and hydrogen under hydrodesulfurization conditions with a sulfided catalyst comprising: (i) at least one non-noble metal of Group VIII; (ii) at least one metal of Group VIB; and (iii) at least one metal of Group IB, IIB and IVA, on an inorganic oxide support.

1 . A process for reducing the sulfur content of a cracked naphtha feedstock containing an olefinic component which comprises: 
 contacting the feedstock with hydrogen in the presence of a sulfided catalyst under hydrodesulfurization conditions, the catalyst comprising (i) at least one non-noble metal of Group VIII, (ii) at least one metal of Group VIB, and (iii) Cu, on an inorganic oxide support thereby affecting the hydrodesulfurization of the feedstock without substantially hydrogenating the olefinic component, wherein said inorganic oxide support is selected from the group consisting of alumina, silica, titania, magnesia, silica-alumina, and mixtures thereof.    
     
     
         2 . The process of  claim 1  wherein the hydrodesulfurization conditions include temperatures in the range of 200° C. to 400° C., pressures of 10 to 1000 psig, hydrogen in amounts of 100 to 6000 SCFB, and LHSV, hr −1  of 0.1 to 20.  
     
     
         3 . The process of  claim 2  wherein the catalyst comprises one Group VIII metal and Cu.  
     
     
         4 . The process of  claim 3  wherein the Group VIII metal is present in an amount ranging from about 0.1 to about 15 wt %; the Group VIB metal from about 0.1 to about 40 wt % and Cu from about 0.01 to about 10 wt %, based on the total weight of the catalyst.  
     
     
         5 . The process of  claim 4  wherein the inorganic oxide support of the catalyst is a large pore alumina.  
     
     
         6 . The process of  claim 5  wherein the alumina has a surface area greater than about 100 m 2 /g, a pore volume greater than about 0.6 ml/g and an average pore diameter greater than about 105 Angstroms.