Dada, Tewodros Kassa, Islam, Md Anwarul, Kumar, Ravinder, Scott, Jason, and Antunes, Elsa (2022) Catalytic co-pyrolysis of ironbark and waste cooking oil using strontium oxide-modified Y-zeolite for high-quality bio-oil production. Chemical Engineering Journal, 450 (4). 138448.

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Abstract

Catalytic co-pyrolysis of ironbark (IB) and waste cooking oil (WCO) over strontium oxide (SrO) loaded hierarchical Y-zeolite was performed using a fixed bed reactor. The effect of reaction temperature, IB:WCO ratio and SrO loading percentage on product distribution and quality was examined. The findings indicated that the highest bio-oil yield (55.3 %) was obtained at a pyrolysis temperature of 550 °C. A further increase in the reaction temperature (650 °C) initiated secondary cracking reactions, which reduced bio-oil yield. Simultaneously, the maximum aromatic yield (28.6 %) was obtained at an IB:WCO ratio of 1:1 and 10 wt% SrO loading. Increasing the amount of WCO enhanced the aromatic yield by providing alkyl radicals and a hydrocarbon pool to promote the conversion of methoxy/hydroxyl, phenols, and levoglucosan into poly-aromatics. Basic sites introduced by SrO addition promoted the ketonization of fatty acids to aliphatic ketones. The reaction mechanism of catalytic co-pyrolysis of IB and WCO showed that the acid sites on Y-zeolite and basic sites on SrO contribute to the conversion of oxygenated compounds to phenols and aromatic hydrocarbons. The present work indicates that SrO/Y-zeolite active sites increased the aromatic carbon yield.

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