Plastics materials have been an integral part in people’s daily life due to their high elasticity, formability and lightweight characteristics which are suitable for many products. However, exponentially growth of plastics waste leads to heavy environmental problems due to the plastics nature which is not easily degradable. One of solution to alleviate environmental problems due to plastics waste is to use pyrolysis method to burn plastics waste and convert them into lighter hydrocarbon which can be used as a source of energy. In this final project, the addition of zeolite catalyst in pyrolysis process of Polypropylene plastic waste has been studied in the terms of energy activation. Isoconversional Friedman and Flynn-Wall-Ozawa methods were used. The results may suggest that the role of zeolite as catalyst is pronounced only in the early stage of pyrolysis process.