Rendimiento del craqueo de polipropileno-poliestireno utilizando nanocatalizadores de α-fe2o3 impregnados en zeolitas y/zsm-5

Abstract

The dependence on polymers has generated environmental problems, where pyrolysis could have offered a solution, although with difficulties such as the lack of selectivity and heterogeneous properties in the resulting products. This research aimed to evaluate the performance of the cracking process of polypropylene and polystyrene using alpha (Fe)_2O_3 Nano catalysts impregnated in Y zeolites and ZSM-5. To achieve this, two tests were carried out with a mixture of each catalyst at 3%, polystyrene at 75%, and polypropylene at 25% in a batch reactor; the solid, liquid, and gaseous products obtained analyzed by IR spectroscopy, GC_MS chromatography, and GC techniques respectively. The results showed that the Nanocatalyst of alpha (FE)_2 O_3 impregnated with ZSM-5 zeolites produced a yield of the solid fraction of 7.85%, gaseous of 4.4% liquid of 87.7% with 77.05% aromatic compounds and 23.81% non-aromatic compounds. While the Nanocatalyst of alpha (FE)_2 O_3 impregnated in ZSM-5 zeolites and obtained a yield for the solid fraction of 7.94%, gas fraction of 13.5%, and liquid fraction of 78.6% with 86.74% of aromatic compounds and 13.27% of non-aromatic compounds. In conclusion, the alpha (Fe)_2 O_3 Nano catalyst impregnated in zeolites presented a performance in the liquid fraction with a higher selectivity in forming aromatic compounds. In contrast, the alpha (Fe)_2 O_3 Nano catalyst impregnated in ZSM-5 zeolites generated a higher yield in the liquid fraction with the highest selectivity in the formation of non-aromatic compounds, this was due to factors such as pore size, surface area, and acidity of the zeolites, which influenced the reactivity and selectivity of the cracking process.