Isomerization of hydrocarbons in the presence of zeolite-containing catalysts

Abstract

Summaryo1.Y-type zeolites with 97% of the sodium removed and after aluminium removal (modulus close to 8) and without precious metal activation—are active and fairly selective catalysts for the isomerization of paraffinic and naphthenic hydrocarbons at 200°–280°C.2.The isomerization activity of HY and HM zeolites correlates with the concentration of strong acid sites; the isomerization of paraffins requires stronger centres sites than are needed for the isomerization of naphthenes.3.HY Catalysts may be used for increasing the octane number of refined oils in catalytic reforming Y-type zeolites with 97% of the sodium removed and after aluminium removal (modulus close to 8) and without precious metal activation—are active and fairly selective catalysts for the isomerization of paraffinic and naphthenic hydrocarbons at 200°–280°C. The isomerization activity of HY and HM zeolites correlates with the concentration of strong acid sites; the isomerization of paraffins requires stronger centres sites than are needed for the isomerization of naphthenes. HY Catalysts may be used for increasing the octane number of refined oils in catalytic reforming