Journal
RSC ADVANCES
Volume 10, Issue 61, Pages 37218-37232Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ra06302a
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Funding
- Ministry of Higher Education Malaysia [FRGS 2014-1, IPM 9559000, UPM/800-3/3/1/GPB/2018/9658700, GBP/2019/9674500]
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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-(C-15+ C-17)-diesel fractions. The predominance ofn-(C-15+ C-17) hydrocarbons with the concurrent production of CO and CO2, indicated that the deoxygenation pathway proceededviadecarbonylation and decarboxylation mechanisms. High deoxygenation activity with bettern-(C-15+ C-17) 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-(C-15+ C-17) 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-(C-15+ C-17) hydrocarbon selectivity within 6 runs.
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