Conversion of spent butane isomerization catalysts to pentane isomerization catalysts

摘要

A spent butane isomerization catalyst which contains platinum and chlorine on alumina is converted to an active n-pentane isomerization catalyst by processes comprising fluorination (preferably with dissolved HF or NH4HF) and calcination (before and/or after the fluorination step). The thus-treated catalysts are used for isomerizing n-pentane to isopentane.