Study on used and possibilities of quality upgrading of oil obtained from tire pyrolysis : case of Pd/H-BETA

Abstract

Catalytic pyrolysis of tire over Pd/H-BETA catalyst was carried out using an autoclave reactor separated into two zones; tire was first pyrolyzed in the bottom zone and then, the evolved pyrolysis gases were passed through a catalytic bed on the top zone. The amount of palladium loading, catalytic temperature, residence time, and metal loading method were investigated for their influences on the quality and quantity of oil, represented by the saturated and aromatic hydrocarbons. The pyrolysis oil was characterized using a simulated distillation gas chromatograph (SIMDIST-GC) and liquid chromatograph technique. The results indicated that Pd/H-BETA catalyst can produce the higher amount of saturated hydrocarbons and reduce the total aromatics in the oil product. The change of metal loading amount affected on the chemical composition and petroleum fractions in maltene. The saturated hydrocarbons were also increased with the increasing catalytic temperature and residence time. The reduction of total aromatic hydrocarbons can be enhanced at low catalytic temperature and residence time. Moreover, the impregnated catalysts had higher activity on reducing aromatic hydrocarbons than the ion- exchanged catalysts. Therefore, the optimum conditions for upgrading of pyrolysis oil were the use of 0.25 wt% Pd/H-BETA prepared by the impregnated technique, operated at 25 min of residence time, and a low catalytic temperature (350°C)