Highly selective production of aviation range hydrocarbons from medium chain fatty acids waste coconut oil fatty acid over metal supported on kaolin derived mesoporous silica

Mesoporous silica (MS) impregnated with Fe, Ni, Cu, Co, and Zn was investigated for the selective production of aviation-range hydrocarbons from medium-chain waste coconut oil. Mesoporous silica from alkali fusion and hydrothermal treatment of kaolin with Sapindus rarak extract (SRE) as a natural template generates a high surface area of 217.12 m2/g, mesopore diameter of 11.70 nm and Lewis density of 0.405 μmol/m2. Modification with Zn enhanced hydrocarbon selectivity at 95.5% with a bio-jet fuel fraction composition (C8-C16) reaching 95.4%. The highly selective Zn/MS over other metals is due to the increased Lewis acidity density (0.839 μmol/m2) and large mesopores (13.93 nm) that facilitate the diffusion of bulky triglyceride molecules during deoxygenation reactions. Resusability studies revealed the highly stable Zn/MS for three reaction cycles, with only a slight reduction of selectivity to (C8-C16) hydrocarbon range. Zn is an effective promoter for mesoporous silica in the decarboxylation of waste coconut oil (WCCO) into bio-jet fuel-range hydrocarbons.

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