A process for dehydrogenating alkane or alkylaromatic compounds comprising contacting, in a fluidized bed, an alkane compound or an alkylaromatic compound and a reconstituted dehydrogenation catalyst, such reconstituted dehydrogenation catalyst having been prepared 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; (b) impregnating the at least partially deactivated dehydrogenation catalyst with a platinum salt solution 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; 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. contacting, in a fluidized bed, an alkane compound or an alkylaromatic compound and a reconstituted dehydrogenation catalyst, such reconstituted dehydrogenation catalyst having been prepared 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; (b) impregnating the at least partially deactivated dehydrogenation catalyst with a platinum salt solution 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; (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; (b) impregnating the at least partially deactivated dehydrogenation catalyst with a platinum salt solution 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; 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.