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The objective of this work is to recycle used engine oil until it is converted into an alternative fuel by catalytic pyrolysis. The effect of using eggshell ash as a catalyst in pyrolysis reactions 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 H 2  15.22%wt, CH 4  16.65%wt and other elements such as C 4 H 8  21.93%wt in non-condensable gases, make it possible to predict the good usability of these products obtained as an alternative fuel.

Catalytic effects of eggshell ash on the conversion of used engine oil to fuel by pyrolysis