@article {46018, title = {Highly efficient Pt-MoOx/ZrO2 catalyst for green diesel production}, journal = {Catalysis Communications}, volume = {125}, year = {2019}, month = {MAY}, pages = {70-76}, type = {Article}, abstract = {

Bimetallic Pt-MoOx supported on ZrO2 exhibits higher catalytic activity than known catalysts for converting fatty acids into green diesel at as low as 200 degrees C. A change in selectivity from decarboxylation/decarbonylation to hydrodeoxygenation and enhancement in the deoxygenation activity of Pt were observed when MoOx was also present in the catalyst composition. In X-ray photoelectron spectra, Pt 4f lines of 4Pt-8MoO(x)/ZrO2 occurred at lower binding energies than those for 4Pt/ZrO2. Part of Mo was reduced from +6 to +5 oxidation state in the presence of Pt. There seems to exist some electronic interaction between the support and metal, making 4Pt-8MoO(x)/ZrO2 a highly efficient and selective deoxygenation catalyst.

}, keywords = {Bimetallic catalyst, Biofuel, Deoxygenation of fatty acids, Green Diesel, Hydrocarbons, Supported platinum catalyst}, issn = {1566-7367}, doi = {10.1016/j.catcom.2019.03.027}, author = {Janampelli, Sagar and Darbha, Srinivas} } @article {46011, title = {Hydrodeoxygenation of vegetable oils and fatty acids over different group VIII metal catalysts for producing biofuels}, journal = {Catalysis Surveys From Asia}, volume = {23}, year = {2019}, month = {JUN}, pages = {90-101}, type = {Article}, abstract = {

Energy security and environment protection are two important aspects of sustainable development. Biofuels are renewable and carbon neutral. They are suitable replacement for conventional fossil derived transport fuels. Their use leads to sustainable development. Among several technological options, catalytic hydrodeoxygenation of vegetable oils leading to diesel-range hydrocarbons is the most attractive approach for producing biofuels. The green diesel, thus produced, could be blended with petro-diesel or used as standalone fuel in the conventional diesel engines. Our research group has been active in developing efficient solid catalysts for hydroprocessing of vegetable oils. This account presents some of our efforts using supported group VIII metals and the importance of electronic contact between metal and support on the catalytic activity and hydrodeoxygenation selectivity in hydroprocessing of vegetable oils.

}, keywords = {biofuels, Catalysis over group VIII metals, Deoxygenation, Hydroprocessing, Renewable diesel}, issn = {1571-1013}, doi = {10.1007/s10563-019-09266-4}, author = {Janampelli, Sagar and Darbha, Srinivas} } @article {47424, title = {Hydrogenolysis of glycerol in an aqueous medium over Pt/WO3/zirconium phosphate catalysts studied by H-1 NMR spectroscopy}, journal = {New Journal of Chemistry}, volume = {45}, year = {2021}, month = {MAR}, pages = {5013-5022}, type = {Article}, abstract = {

Bifunctional Pt/WO3/zirconium phosphate catalyzes the liquid-phase hydrogenolysis of glycerol in an aqueous medium. H-1 NMR spectroscopy (solvent suppression pulse program) is employed to monitor this reaction. Propanediols (1,3 + 1,2-PDO) formed as the major product along with propanols (1- and 2-POs) as the minor product. A synergistic enhancement in glycerol conversion and selectivity to 1,3-PDO was observed when both Pt and WO3 were present in the catalyst. A volcano-shape variation of catalytic activity with W content was observed. A catalyst with 8 wt\% W and 1 wt\% Pt exhibited the highest selective hydrogenolysis performance (glycerol conversion = 92.3\% and total PDOs selectivity = 45.9\% and 1,3-PDO selectivity = 20.8\% at 200 degrees C). Dispersed Pt in contact with polytungstate-type WO3 species was found to be the active catalytic site. H-1 NMR spectroscopy is demonstrated as an attractive technique to quantify the products of a glycerol hydrogenolysis reaction.

}, issn = {1144-0546}, doi = {10.1039/d0nj05557c}, author = {Bhowmik, Susmita and Enjamuri, Nagasuresh and Darbha, Srinivas} }