Journal
CATALYSIS TODAY
Volume 309, Issue -, Pages 219-226Publisher
ELSEVIER
DOI: 10.1016/j.cattod.2017.06.030
Keywords
Deoxygenation; Fatty acids; Biofuels; Diesel-range hydrocarbons; Pt catalyst
Funding
- University Grants Commission (UGC), New Delhi
- Network project Catalysts for Sustainable Energy (ECat) [CSC 0117]
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Tungsten oxide promoted platinum catalysts (Pt-WOx/Al2O3) of varying composition were prepared by wet impregnation method and reduced in hydrogen atmosphere. X-ray powder diffraction and photoelectron spectroscopy revealed that Pt is completely reduced to metallic state while tungsten is in + 6 and + 5 oxidation states. Pt crystallite and particle sizes increased (from 1.2 to 1.4 nm and 2.5 to 3 nm, respectively) in presence of WOx (CO-chemisorption and transmission electron microscopy). Tungsten addition augmented strong acid sites. It enhanced significantly the catalytic activity of Pt/Al2O3 in deoxygenation of fatty acids and their methyl esters. Tungsten altered the reaction pathway from decarbonylation/decarboxylation to hydrodeoxygenation. A catalyst with 4 wt% Pt and 8 wt% W exhibited high catalytic performance. Complete conversion of oleic acid and octadecane product selectivity in the range 67.1-80.8% was obtained. Pt-WOx/Al2O3 is a stable and reusable fatty acid deoxygenation catalyst.
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