Reconstituted dehydrogenation catalyst showing slowed activity loss when compared with fresh catalyst

A process for dehydrogenating alkane or alkylaromatic compounds comprising:

• (1) reconstituting an at least partially deactivated dehydrogenation catalyst by
• (a) obtaining a dehydrogenation catalyst comprising platinum and gallium on an alumina-based support, the dehydrogenation catalyst having been previously fresh but having become at least partially deactivated by the selective removal of platinum from the dehydrogenation catalyst, wherein the at least partially deactivated dehydrogenation catalyst has a ratio of platinum to gallium that is less than a ratio of platinum to gallium of the previously fresh dehydrogenation catalyst;
• (b) impregnating the at least partially deactivated dehydrogenation catalyst with a solution consisting of a platinum salt in water to form an impregnated dehydrogenation catalyst;
• and
• (c) calcining the impregnated dehydrogenation catalyst at a temperature ranging from 400° C. to 1000° C.;
• (b) and (c) being carried out under conditions suitable to form a reconstituted dehydrogenation catalyst having (i) a platinum content ranging from 1 part per million, based on weight of catalyst, to 500 parts per million, based on weight of catalyst;
• (ii) a gallium content ranging from 0.2 wt % to 2.0 wt %;
• and (iii) a ratio of platinum to gallium ranging from 1:20,000 to 1:4;
• and
• (2) contacting, in a fluidized bed, an alkane compound or an alkylaromatic compound with at least a portion of the reconstituted dehydrogenation catalyst,
• wherein the reconstituted dehydrogenation catalyst further exhibits a platinum retention greater than or equal to the platinum retention of a fresh dehydrogenation catalyst when each is used in the same or another, otherwise identical dehydrogenation process.