The industrially deactivated Pt-0.5-Sn-1.5-K-0.5-Mg-1/gamma-Al2O3 catalyst for dehydrogenation of long chain paraffins (n-C-10 degrees-C-(13 degrees)) was regenerated by coke burn off and metals (Pt, Sn and K) modification. The catalysts were characterized by TG, BET, CO-chemisorption, H-2-TPR, XRD and mechanical crushing strength test. Paraffin dehydrogenation was performed on a bench reactor at the industrial site. Results showed that temperature increase during coke combustion can be effectively controlled with O-2 content lower than 1%. The combustion temperature should be higher than 500 degrees C to burn all the coke and lower than 550 degrees C to avoid Pt sintering. Under optimal conditions, coke combustion results only in 92% recovery of catalyst activity. Subsequent metals modification with additional 0.01 wt.% Pt addition can recover catalytic performance completely, paraffin conversion and olefin selectivity to the levels of fresh catalyst. The modified catalyst has longer life-time of 77 days compared to fresh catalyst of 69 days. Results are explained in terms of the characteristics of the catalysts. (C) 2015 Elsevier B.V. All rights reserved.