Dehydrocyclization with an acidic multimetallic catalytic composite

Abstract

Abstract Dehydrocyclizable hydrocarbons are converted to aromatics by contacting them at dehydrocyclization conditions with an acidic multimetallic catalytic composite comprising a combination of catalytically effective amounts of a platinum group component, a Group IVA metallic component, a lanthanide series component, and a halogen component with a porous carrier material. The platinum group, Group IVA metallic and halogen components are present in the multimetallic catalyst in amounts respectively, calculated as wt. % of finished caralyst and on an elemental basis, corresponding to about 0.01 to about 2 wt. % platinum group metal, about 0.01 to about 5 wt. % Group IVA metal, and about 0.1 to about 3.5 wt. % halogen. The lanthanide series component is present in an amount corresponding to an atomic ratio of lanthanide series metal to platinum group metal of about 0.1:1 to about 1.25:1. Moreover, the catalytically active sites induced by these metallic components are uniformly dispersed throughout the porous carrier material and these metallic components are present in the catalyst in carefully controlled oxidation states such that substantially all of the platnium group component is in the elemental metallic state and substantially all of the Group IVA metallic component and lanthanide series component are present in an oxidation state above that of the corresponding elemental metal. A specific example of dehydrocyclization method disclosed herein is a method for converting a feed mixture of n-hexane and n-heptane to a produce mixture of benzene and toluene which involves contacting the feed mixture and a hydrogen stream with the acidic multimetallic catalyst disclosed herein at dehydrocyclization conditions.

Inventors

• 👤 George J. Antos

Bibliographic Details