01786nas a2200217 4500008004100000022001400041245013300055210006900188260000800257300001200265490000800277520101600285653001301301653001801314653003001332653001601362653001601378100002201394700002101416856013101437 2017 eng d a0920-586100aSelective and reusable Pt-WO x /Al 2 O 3 catalyst for deoxygenation of fatty acids and their esters to diesel-range hydrocarbons0 aSelective and reusable PtWO x Al 2 O 3 catalyst for deoxygenatio cJUN a219-2260 v3093 aTungsten 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 state. 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.10abiofuels10aDeoxygenation10aDiesel-range hydrocarbons10aFatty acids10aPt catalyst1 aJanampelli, Sagar1 aSrinivas, Darbha uhttps://library.ncl.res.in/content/selective-and-reusable-pt-wo-x-al-2-o-3-catalyst-deoxygenation-fatty-acids-and-their-esters01780nas a2200169 4500008004100000022001400041245008800055210006900143260000900212300001200221490000700233520119400240100002201434700001901456700002101475856011401496 2020 eng d a2044-475300aSelective, bifunctional Cu-WOx/Al2O3 catalyst for hydrodeoxygenation of fatty acids0 aSelective bifunctional CuWOxAl2O3 catalyst for hydrodeoxygenatio cJAN  a268-2770 v103 a

Selective hydrodeoxygenation of oleic acid (OA; in a batch reactor, at 300 degrees C, 30 bar H-2 pressure, reaction time of 1 h and reactant-to-catalyst weight ratio of 2 g OA/0.2 g) forming n-octadecane in yields as high as 93% over a non-noble metal, sulfur-free, bimetallic Cu-WOx/Al2O3 catalyst is reported for the first time. Several Cu-WOx/Al2O3 compositions were prepared by a sequential wet-impregnation method and evaluated. A catalyst with 10 wt% Cu and 4 wt% W enabled the highest activity and selectivity. Upon adding WOx, the amount of moderate and strong acid sites increased and more Cu in the catalyst was in reduced electron-rich metallic (Cu-0) state. The crystallite size and dispersion of Cu were little affected. WOx promoted the fatty acid hydrodeoxygenation activity of Cu. While a monometallic Cu catalyst (10Cu/Al2O3) yielded n-octadecane and n-heptadecane along with high amounts of intermediate octadecanol and octadecanal products, the bimetallic catalyst (10Cu-4WO(x)/Al2O3) gave mainly n-octadecane. Acidity and the high amount of reduced Cu-0 species are responsible for the high catalytic hydrodeoxygenation performance of this bimetallic catalyst.

1 aJanampelli, Sagar1 aSethia, Govind1 aDarbha, Srinivas uhttps://library.ncl.res.in/content/selective-bifunctional-cu-woxal2o3-catalyst-hydrodeoxygenation-fatty-acids09572nas a2200145 4500008004100000245011200041210006900153260000800222300001200230490000800242520900700250100002209257700002109279856012609300 2021 eng d00aSelective deoxygenation of fatty acids to fuel-range hydrocarbons over Pt-MOx/ZrO2 (M = Mo and W) catalysts0 aSelective deoxygenation of fatty acids to fuelrange hydrocarbons cSEP a174-1800 v3753 a

A comparative catalytic activity study of Pt-MoOx/ZrO2 and Pt-WOx/ZrO2 for deoxygenation of oleic acid (OA) forming fuel-range, linear hydrocarbons is reported. These catalysts (with 4 wt% Pt and 8 wt% Mo or W) were prepared by a sequential wet-impregnation method and characterized for the structural and electronic properties. Pt-MoOx/ZrO2 showed higher catalytic activity than Pt-WOx/ZrO2. Hydrodeoxygenation was the selective pathway over these bifunctional catalysts yielding n-octadecane. High conversion of OA was achieved at 200 °C itself. On the contrary, monometallic Pt/ZrO2 was weakly active. It was selective mainly toward decarboxylation/decarbonylation producing n-heptadecane. Higher amounts of Pt and metal oxide in reduced forms are responsible for the high hydrodeoxygenation activity and selectivity of these reusable, bimetallic catalysts.

1 aJanampelli, Sagar1 aDarbha, Srinivas uhttps://library.ncl.res.in/content/selective-deoxygenation-fatty-acids-fuel-range-hydrocarbons-over-pt-moxzro2-m-mo-and-w