Catalyst for selective opening of cyclic naphtha and process for using the catalyst

Abstract

A catalyst and process for opening aliphatic cyclic hydrocarbons have been developed. The catalyst comprises a catalytic metal component, a molecular sieve and refractory inorganic oxide component. The molecular sieve is selected from the group consisting of MAPSOs, SAPOs, UZM-8, UZM-8HS, UZM-15, UZM-15HS, UZM-16, UZM-16HS and mixtures thereof. Preferred catalytic metals include platinum, palladium and rhodium. The catalyst may also contain a modifier such as niobium, titanium, or rare earth metals.

1 . A process for producing acyclic paraffins from cyclic paraffins comprising contacting a feed stream comprising cyclic paraffins with a catalyst comprising a catalytic metal component, a refractory inorganic oxide component and a molecular sieve characterized in that it has an OH peak shift in its CO FTIR spectrum of less than 310 cm −1  and is selected from the group consisting of MAPSOs, SAPOs, UZM-8, UZM-8HS, UZM-15, UZM-15HS, UZM-16, UZM-16HS and mixtures thereof at ring opening conditions to convert at least a portion of the cyclic paraffins to acyclic paraffins. 
     
     
         2 . The process of  claim 1  where the catalytic metal is selected from the group consisting of platinum, palladium, rhodium, ruthenium, iridium and mixtures thereof. 
     
     
         3 . The process of  claim 1  where the catalyst is a physical mixture of molecular sieve particles and refractory inorganic oxide component particles. 
     
     
         4 . The process of  claim 3  where the catalytic metal component is deposited on the molecular sieve. 
     
     
         5 . The process of  claim 3  where the catalytic metal component is deposited on the oxide component which is selected from the group consisting of alumina, silica, silica/alumina, calcium oxide, magnesium oxide and mixtures thereof. 
     
     
         6 . The process of  claim 1  where the catalyst is formed into a shaped article selected from the group consisting of pills, extrudates, spheres, irregularly shaped particles and tablets. 
     
     
         7 . The process of  claim 1  where the catalytic metal component is present in an amount from about 0.01 to about 10 weight percent of the catalyst as the metal. 
     
     
         8 . The process of  claim 1  where the catalyst further comprises a modifier component selected from the group consisting of titanium, niobium, rare earth elements, tin, rhenium, zinc, germanium and mixtures thereof. 
     
     
         9 . The process of  claim 8  where the modifier component is present in an amount from about 0.1 to about 50 wt. % of the catalyst as the element. 
     
     
         10 . The process of  claim 1  where the ring opening conditions include a temperature of about 200° C. to about 600° C. a pressure of about atmospheric to about 20,684 kPa and a liquid hourly space velocity of about 0.1 to about 30 hr −1 . 
     
     
         11 . The process of  claim 8  where the rare earth element is selected from the group consisting of cerium, ytterbium, lanthanum, dysprosium and mixtures thereof.