Generating organic liquid products from catalytic cracking of used cooking oil over mechanically mixed catalysts

Abstract

Used cooking oil is unsuitable to use again in the food process, but it may be harnessed as raw material in biofuel production. In this work, used palm oil was reacted via cracking over mechanically mixed catalysts between ZSM-5 and Y-Re-16 to generate organic liquid products (OLP). The catalysts used were known for high acidity and low cost for decomposition, degradation, and deoxygenation of triglycerides. The cracking experiments were conducted in a flow reactor. The experimental variables included reaction temperature between 300-500 °C, catalyst loading between 5-20 % w/w, and ratio of mixed catalyst between ZSM-5 and Y-Re-16 from 0-100 % w/w. They were set via response surface methodology and central composite design of experiments. Both catalysts showed good cracking reaction. The optimum condition for generating the OLP of about 85 % w/w was found at 300 °C, 5 % catalyst loading, 97 % ratio of mixed catalyst. The OLPs with different short-chain hydrocarbons between C7-C21 were identified. The main components were 71.43% of diesel, 12.11% of gasoline, and 8.95% of kerosene-like components. ©2020. CBIORE-IJRED. All rights reserved.