Attempts have been made to understand the non-isothermal kinetics of cracking of Jatropha oil (JO), vacuum residue (VR) and high density polyethylene (HOPE) and their combined co-cracking using different heating rates of 5 K min(-1), 10 K min(-1), 15 K min(-1) and 20 K min(-1) under the nitrogen (N-2) atmosphere. The Flynn-Wall-Ozawa and Kissinger-Akahira-Sunose (KAS) models were employed to study the kinetic analysis of the samples. To evaluate the exponential factor the model fitting of Coats-Redfern approach was used. The distribution of the activation energy for these entire combined reaction scheme has been discussed. Authors have reported that the non-isothermal kinetic studies of the co-cracking ofJO + VR and VR + HDPE show the existence of synergism in their co-cracking reactions, however JO + HDPE co-cracking shows interaction among the reactive cracked intermediates of JO and HOPE. (C) 2012 Elsevier B.V. All rights reserved.