Boreskov Institute of Catalysis SB RAS, Novosibirsk, Russia

OP-3-2REDUCING CONVERSIONS OF GLYCEROL OVER Ni-CATALYSTSKorolev Yu.A., Greish A.A., Kustov L.M.N.D. Zelinsky Institute of Organic Chemistry, 119991, Moscow, Russia,Leninsky prosp., 47, lmk@ioc.ac.ruLast years a search of renewable natural resources of fuel is of great importancebecause of the world oil reserve depletion and increased attention to theenvironmental protection. Producing of biodiesel fuel by means of transesterificationof plant oil or animal fat with methanol can become one of such directions. Glycerol isproduced in the mentioned process as a general by-product. In this connection thereis a big problem of glycerol utilization. From this point of view catalytichydrodehydroxylation of glycerol in H 2 atmosphere followed by formation of suchvaluable products as propanediols and ethylene glycol is perspective direction ofprocessing of glycerol stocks.In the flow setup it was studied the influence of temperature and hydrogenpressure on glycerol conversion and the products yield on Ni-Cr 2 O 3 and Ni Raneytaken as the catalysts.During the runs H 2 / glycerol ratio was varied also.Ni-Cr 2 O 3 . It was found a rise in temperature increased the yield of a targetproducts. Particularly, at 220 °C glycerol conversion and the yield of 1,2-propanediolare equal to 47 % and 21 % respectively, while at 260 °C these values are close to97 % and 31 %.Ni Raney. Studying of temperature effect on hydrodehydroxylation of glycerol at20 at pressure showed the most yield of 1,2-propanediol (32 %) to be obtained at220 °C, at that time glycerol conversion was close to 80 %. The highest selectivity to1,2-propanediol, more than 61 %, is reached at 180 °C.At 240 °C a complete conversion of glycerol is observed. In these conditionsseveral by-products are formed, e.g. lower alcohols; the yield of methanol andethanol are of 17 % and 51 %, respectively. Noteworthy, in reaction conditionsconsiderable quantity of methane is formed also. During temperature rise to 260 °Cthe yield of methane increases up to 90 %.Increase in H 2 pressure from 5 to 50 at results in decrease in the yield of acetolfrom 12 % to 0,4 %. When using of Ni Raney, there is no sharp fall of glycerolconversion during increasing of H 2 pressure, as opposite to Ni-Cr 2 O 3 catalyst.70