Washing platinum, germanium, rhenium, alumina catalysts - with water to regulate their chlorine content and increase their hydrocarbon conversion activity

摘要

The process of the parent patent for regulation the Cl content of hydrocarbon-conversion catalysts by washing with liq. H2O followed by drying, calcination in air and redn. treatment, is applied to catalysts comprising Pt in free or combined form and Ge and/or Re in free or combined form on an Al2O3 support. Washing is pref. effected with distd. H2O at 30-100 degrees C until the Cl content of the catalyst no longer changes. The washing has the effect of removing a cpd. with approx. the stoichiometry of AlCl3 which impairs the properties of the catalyst.