Pyrolysis oil production from polypropylene plastic waste using molybdenum modified alumina-silica catalysts

Abstract

The production of pyrolysis oil from polypropylene plastic waste was examined over molybdenum modified alumina-silica catalysts (Mo/Al-Si). The reactions were carried out with 1 L of batch reactor under atmospheric pressure at 430 °C. The pyrolysis oil yield was in the order, 10% Mo/Al-Si > 5% Mo/Al-Si > the absence of catalyst. The 10% Mo/Al-Si was highest activity due to the stronger acidity facilitating the pyrolysis reaction. It accelerated the reaction to produce the pyrolysis oil at lower temperature. Comparison of the pyrolysis oil properties to the standards of the diesel fuel from Thai Department of Energy Business shows that the color and the distillation were within standards. Moreover, the results reveal that the kind of raw material affected the product yield of pyrolysis process.

Optimization of Polypropylene Waste Recycling Products as Alternative Fuels through Non-Catalytic Thermal and Catalytic Hydrocracking Using Fresh and Spent Pt/Al2O3 and NiMo/Al2O3 Catalysts

“…Therefore, it is possible to take the spent catalyst from these refineries and use it in polymer waste hydrocracking reactions after regenerating. In addition, the high acidity properties and the moderate price of alumina catalysts makes it possible to use them without affecting the economic viability of the process compared to other expensive catalysts such as zeolites [24,25]. Moreover, it was shown that adding metals such as molybdenum, platinum and nickel to a catalyst can increase the acidity of the catalyst, and more cracking of large molecules with better liquid quality would be achieved due to the saturation of unsaturated hydrocarbon, and produce a more stable range of gasoline-diesel products [21].…”