Patent ID: 7846861

Claim:
A process for regenerating a solid-state catalyst which comprises tungsten and having a Hammett acidity H o of <+2 and includes at least one promoter compound selected from the group consisting of a compound of gold, silver, copper, vanadium, platinum, palladium, rhodium, ruthenium, samarium, cerium, yttrium, scandium, lanthanum, zinc, magnesium, iron, cobalt, nickel and mixtures thereof, and optionally an additional compound of a element selected from the group consisting of lithium, sodium, potassium or cesium, and mixtures thereof and/or montmorillonite or an acidic zeolite, which catalyst, after use in a process for dehydrating glycerol to acrolein, has a lower activity and/or selectivity than before said dehydrating; in which the process the catalyst is exposed to an oxidizing or reducing atmosphere for regeneration.