Patent ID: 7816571

Claim:
A process for selectively hydrogenating one or more C 5 -C 11 diolefins in a hydrocarbon mixture having 0.5 mol% or greater total monolefin content and 0.1 mol% or greater total diolefin content to one or more respective C 5 -C 11 monoolefins the process comprising the step of: (i) bringing the hydrocarbon mixture under selective hydrogenation conditions into contact with a layered catalyst composition to give substantially a C 5 -C 11 monoolefin product; wherein the layered catalyst composition comprises: (a) a refractory inner core having an inner core surface area and comprising at least one refractory material, and (b) a non-refractory outer layer having an outer layer surface area and bonded to said refractory inner core, said non-refractory outer layer comprising at least one non-refractory material and has dispersed thereon at least one IUPAC Group 1-2 metal and at least one IUPAC Group 8-10 metal; (ii) wherein a predetermined efficacy of the layered catalyst composition for selectively hydrogenating one or more C 5 -C 11 diolefins in the hydrocarbon mixture is obtained, whereby the selectivity for conversion of dicyclopentadiene (DCPD) to its corresponding cyclo-C 10 -monoolefin is 55% or greater, as determined at a DCPD conversion of 95%, and (a) said predetermined efficacy is determined by a selective hydrogenation testing procedure, wherein a hydrocarbon testing mixture, having 5.9 wt% monoolefins, 2.9 wt% dicyclopentadiene (DCPD), 7.4 wt% non-DCPD diolefins, 7.9 wt% saturated hydrocarbons and 75.9 wt% aromatics, is treated with said layered catalyst composition under a selective hydrogenation process (SHP) test conducted at 3447 kPa(g) over a temperature range from 50° C. to 120° C., using a hydrogen to total hydrocarbon molar ratio of 2.5:1 and a liquid hourly space velocity (LHSV) of 3 hr −1 .