Zerdane, YoughourtaLargeau, Jean FrançoisHachemi, MadjidTazerout, Mohand2023-07-252023-07-252022https://doi.org/10.1080/00986445.2022.206https://dspace.univ-boumerdes.dz/handle/123456789/11963The objective of this work is to recycle used engine oil until it is converted into an alterna- tive fuel by catalytic pyrolysis. The effect of using eggshell ash as a catalyst in pyrolysis reac- tions on the yield of the resulting fractions was investigated. In addition, the influence of this catalyst on the compositions and the quality of the non-condensable gas and liquid fractions were analyzed. The results show that the liquid fraction recovered 97.02%wt; with 20%wt of the catalyst is predominant. The detection of aromatics 15.84%wt, olefins 32.74%wt, naphthenic 2.82%wt, paraffins 29.00%wt, and alcohols 20.50%wt, in the pyrolytic liquid and the observation of H2 15.22%wt, CH4 16.65%wt and other elements such as C4H8 21.93%wt in non-condensable gases, make it possible to predict the good usability of these products obtained as an alternative fuel.enAlternative fuelCatalystEggshell ashPyrolysisRecyclingUsed engine oilArticle