CeO2 and La2O3 Promoters in the Steam Reforming of Polyolefinic Waste Plastic Pyrolysis Volatiles on Ni-Based Catalysts

[EN] Based on the promising results of La2O3 and CeO2 promoted Ni/Al2O3 catalysts in the reforming \nof biomass pyrolysis volatiles, the performance of these catalysts and the non-promoted one was \n2 evaluated in the pyrolysis and in-line steam reforming of polypropylene (PP). The experiments \nwere carried out in a continuous bench scale pyrolysis-reforming plant using two space times of \n4.1 and 16.7 gcat min gplastic−1 and a steam/PP ratio of 4. The prepared catalysts and the deposited \ncoke were characterized by N2 adsorption-desorption, X-ray fluorescence (XRF), X-ray \ndiffraction (XRD), temperature programmed oxidation (TPO) and transmission electron \nmicroscopy (TEM). The Ni/Al2O3 catalyst showed suitable performance regarding pyrolysis \nproduct conversion and hydrogen production, and led to moderate coke deposition. It is to note \nthat La2O3 incorporation remarkably improved catalyst performance compared to the other two \ncatalysts in terms of conversion (> 99 %), hydrogen production (34.9 %) and coke deposition \n(2.24 wt%).