Abstract: A catalyst and a process for using the catalyst are disclosed generally for the conversion of hydrocarbons. The catalyst has an increased average bulk density and a decreased mass ratio of platinum-group metal. The process using the catalyst obtains unexpected high activity and stability for the reforming of naphtha range hydrocarbons. Mössbauer spectroscopy is used to characterize the extent of tin association with platinum and determine an effective molar tin ratio appropriate for alumina supports with densities above 0.6 g/cc.

Abstract: This invention relates to a process for reactivating a dehydrocyclodimerization catalyst. Dehydrocyclodimerization catalysts which contain an aluminum phosphate binder can be deactivated when they are exposed to hydrogen at temperatures above 500° C. The instant process restores substantially all of the catalyst's lost activity. The process involves treating the catalyst with a fluid comprising water and drying the catalyst. The process is employed particularly advantageously in combination with coke removal for reactivating catalysts that contain coke deposits and that have also been hydrogen deactivated. This invention also relates to a method of producing a dehydrocyclodimerization catalyst that is resistant to hydrogen deactivation.