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Plastic Waste Thermocatalytic Pyrolysis with Carbonate based Catalysts FIELD OF THE DISCLOSURE This disclosure relates to a catalytic method for depolymerizing plastic feedstock, and to certain catalyst for the depolymerization. More particularly, it relates to methods for the depolymerizing plastic feedstock in the presence of a catalyst based on carbonates. BACKGROUND OF THE DISCLOSURE Plastics are inexpensive and durable materials, which can be used to manufacture a variety of products that find use in a wide range of applications, so that the production of plastics has increased dramatically over the last decades. Due to the durability of the polymers involved in plastic production, an increasing amount of plastics are filling up landfill sites and occupying natural habitats worldwide, resulting in environmental problems. Even degradable and biodegradable plastics may persist for decades depending on local environmental factors, like levels of ultraviolet light exposure, temperature, presence of suitable microorganisms and other factors. Chemical recycling reprocesses plastics and modifies their structure so that they can be used as raw material for differ...