Development of bimetallic nickel-based catalysts supported on activated carbon for green fuel production

Abstract

In this work, the catalytic deoxygenation of waste cooking oil (WCO) over acid-base bifunctional catalysts (NiLa, NiCe, NiFe, NiMn, NiZn, and NiW) supported on activated carbon (AC) was investigated. A high hydrocarbon yield above 60% with lower oxygenated species was found in the liquid product, with the product being selective towardn-(C15+ C17)-diesel fractions. The predominance ofn-(C15+ C17) hydrocarbons with the concurrent production of CO and CO2, indicated that the deoxygenation pathway proceededviadecarbonylation and decarboxylation mechanisms. High deoxygenation activity with bettern-(C15+ C17) selectivity over NiLa/AC exposed the great synergistic interaction between La and Ni, and the compatibility of the acid-base sites increased the removal of oxygenated species. The effect of La on the deoxygenation reaction performance was investigated and it was found that a high percentage of La species would be beneficial for the removal of C-O bonded species. The optimum deoxygenation activity of 88% hydrocarbon yield with 75%n-(C15+ C17) selectivity was obtained over 20% of La, which strongly evinced that La leads to a greater enhancement of the deoxygenation activity. The NiLa/AC reusability study showed consistent deoxygenation reactions with 80% hydrocarbon yield and 60%n-(C15+ C17) hydrocarbon selectivity within 6 runs.