Effects of temperature and catalytic reduction of sulfur content on kinematic viscosity and specific gravity of tire pyrolysis oil

Production of low-sulfur fuels from catalytic pyrolysis of waste tires using formulated red mud catalyst

“…It has also been reported that the cleavage of the C–S bond in high molecular weight components of heavy oils results in decrease in oil viscosity, which probably occurred in the CTPO [ 55 ]. It has been reported that the reduction in sulfur content of waste tire pyrolysis oils correlated with the reduction in viscosity of the oils [ 52 ], which agrees with our data.

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“…The viscosities of compounds depend on carbon chain length and the degree of branching. Straight chain hydrocarbons are more viscous than branched chain hydrocarbons [ [50] , [51] , [52] , [53] ] and low molecular weight compounds have lower viscosity than the higher molecular weight compounds. Thus, we can surmise that the decrease in viscosity of the CTPO with TOS was probably due to cracking of higher molecular weight compounds to lower molecular weight compounds promoted by new compounds formed on the catalyst surface with increased TOS.…”