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polyethylene (LDPE), polypropylene (PP) and polystyrene (PS)) using spent fluid catalytic cracking (FCC) catalystinto liquid product were comparatively studied with a stirred semi-batch reactor at 400oC, under nitrogen stream. Liquidproduct characteristics were described by cumulative distribution as a function of lapse time of reaction, parafin, olefin,naphthene and aromatic (PONA) composition, and also carbon number distribution on plastic type of reactant. Fordegradation of waste PE with relatively high degradation temperature, the effect of adding spent FCC catalyst greatlywith low degradation temperature showed a similar trend in both non-catalytic and catalytic degradation at 400oC. InPONA and carbon number distribution of liquid product, the characteristics of waste PS that was mainly degraded byend chain scission mechanism were not much altered in presence of spent FCC catalyst. However, waste polyolefinicpolymer that was degraded by a random chain scission mechanism significantly difered on PONA and carbon num-ber distribution of liquid product with or without spent FCC catalyst. The addition of spent FCC catalyst in degradationlight olefin product by its high cracking ability and also the aromatic product by cyclization of olefin as shape selectivityin micropore of catalyst.