FCC spent catalyst as an alternative reagent in Mo-contaminated hazardous waste enhanced stabilization

Mancini, Giuseppe; Palmeri, F.; Benina, G.; Cacciola, S.; Luciano, Antonella; Fino, Debora

doi:10.1016/j.scp.2022.100733

Cited by 1 publication

(1 citation statement)

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“…At present, the spent catalysts produced in the petroleum refining process are mainly disposed of by landfill method. [19,20] From the point of view of economic sustainability, since these catalysts still have some activity and economic value, if abandoned directly, it will not only cause a waste of resources and a large amount of land occupied but also produce serious security risks. [21][22][23] Catalysts have great advantages in the treatment of plastic waste.…”

Section: Introductionmentioning

confidence: 99%

Study on kinetics of spent FCC catalyst applied to the living waste plastics

Shan

Wang

Bian

et al. 2023

Polymer Engineering & Sci

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The thermochemical method is one of the most potential ways to treat waste plastics. In order to reduce the energy consumption of pyrolysis, this study selected spent fluid catalytic cracking (FCC) catalyst as a catalyst for pyrolysis of waste plastics to explore the pyrolysis process of mixed waste plastics (polypropylene (PP)/polyethylene (PE)/polystyrene (PS)). The kinetic calculations show that there was a positive synergistic effect in the co-pyrolysis of mixed plastics, which was beneficial to the reduction of activation energy. However, the participation of spent FCC catalysts can further reduce the pyrolysis temperature and activation energy of plastics, and increase the thermal degradation rate. Compared with non-catalytic pyrolysis, the pyrolysis temperature corresponding to the maximum weight loss rate during catalytic pyrolysis was about 12 K earlier, the maximum degradation rate was about 41% higher, and the average activation energy decreased by about 22 kJ/mol. In order to further improve the catalytic efficiency of spent FCC catalysts, the spent FCC catalysts were modified by ball milling or ultrasonic method and then used for plastic pyrolysis. It was found that the modification effect of ball milling method was better than that of the ultrasonic method. Through thermodynamic analysis, it was found that the endothermic reaction occurred in the process of plastic pyrolysis and could not proceed spontaneously. The formed pyrolysis products reduced the disorder of a microscopic system. Combined with the experimental results of this paper, it can provide theoretical support for the catalytic pyrolysis of spent FCC catalysts for mixed waste plastics.

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