OP-II-3

PP-III-12THE METHOD OF GLYCERIC ACID PREPARATION AND GOLDSUPPORTED CATALYSTS FOR ITS REALIZATIONČornaja S. 1 , Žižkuna S. 1 , Muravjova O. 1 , Kampars V. 1 , Grabis J. 2 ,Jankoviča D. 2 , Kampare R. 1 , Dubencovs K. 11 Riga Technical University, Faculty of Material Science and Applied Chemistry,Riga, Latvia, svetlana@ktf.rtu.lv2 RTU Institute of Inorganic Chemistry, Riga, LatviaGlycerol is the main by-product of biodiesel fuel manufacturing. Glycerol catalyticoxidation by molecular oxygen is one of the feasible methods of glycerol utilization. Anumber of important and valuable products, which are used as a feedstock in variousprocesses of organic synthesis, can be obtained in the process of glycerol oxidation.Currently the supply of these chemicals is limited due to high costs. Glycerol catalyticoxidation by molecular oxygen can substantially decrease the cost of oxidation products.Kinetics of glycerol oxidation in presence of various gold based catalysts hasbeen studied in this research. There are new synthesized gold containing catalystsand commercial 1,5% Au/TiO 2 catalyst utilized.According to the data presented in this research, activity of the new Au/TiO 2 catalystis dependent on the catalyst specific surface (Scs), gold particles size (dAu), NaOHinitial concentration, catalyst concentration and oxidation temperature. Activity of thecatalyst increases along with decrease of the size of gold particles and increase of Scs.Research demonstrated that new gold containing catalysts are active, and yieldof glyceric acid in presence of the new catalysts is equal to or higher than inpresence of the commercial catalyst.Glyceric acid is obtained as a main product with high yield and selectivity.Optimal parameters for the production of glyceric acid in closed thermostatedgasometrical equipment in presence of 5% Au/TiO 2 catalyst have been determined:T = 333 K, = 1atm, c0(glycerol) = 0,3 M, c0(NaOH) = 1,5 M, n(glycerol)/n(Au) = 300. Theyield of glyceric acid is 68 mol% with 85% selectivity, for oxidation time equal to 120 min.Optimal parameters for the producing of glyceric acid in barbotage type reactor inpresence of 5% Au/TiO 2 catalyst have been determined: T = 333 K, = 1atm,c 0 (glycerol) = 0,3 M, c 0 (NaOH) = 1,5 M, n(glycerol)/n(Au) = 300. The yield of glycericacid is 79 mol% with 90% selectivity, oxidation time equal to 420 min.461