Glycerol conversion by heterogeneous catalysis
A technology of glycerol and catalyst, applied in the field of lactic acid, can solve problems such as industrial application that cannot be considered
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example 1
[0023] Example 1: Synthesis of lactic acid according to the method of the invention, and Comparative studies of other catalysts.
[0024] Catalysts Ir / ZrO2 and Pt / ZrO2 (metal accounts for 1% by weight) are prepared by impregnating ZrO2 supports. Between monoclinic zirconia (Saint-Gobain, 50m 2 / gNorPro Zirconia). impregnated by respectively based on the precursor IrCl 3 and H 2 PtCl 6 ·6H 2 O solution in water. After calcination at 600°C for 12 hours under air flow and reduction at 300°C for 3 hours under H2 atmosphere, catalysts with comparable metal content (ie 1% by weight) were obtained. Kinetic studies were performed to compare their activity in reference conditions (100 ml of 5% glycerol / 1 M aqueous NaOH, 180° C., 30 bar inert gas, 500 mg of 1% M / ZrO2). The reactants were introduced into an autoclave made of stainless steel and subjected to an initial helium pressure of 25 bar (Pf = 30 bar), wherein the autoclave was equipped with a Made pot body. The mixtu...
example 2
[0037] Example 2: Synthesis of lactic acid based on glycerol in the presence of a platinum-based catalyst Comparative studies where the platinum-based catalysts are on different supports: Pt / ZrO2 and Pt / C.
[0038] The yield and selectivity of the lactic acid synthesis according to the invention as described in Example 1 has been compared with that of a reaction also using a platinum-based heterogeneous catalyst but on a different support (charcoal). Pt / C catalysts are known to give good yields in this reaction.
[0039] The Pt / C catalyst used is based on the BET specific surface of 900 m according to the method described in the literature P.Korovchenko, C.Donze, P.Gallezot, M.Besson, "Catalysis Today", 2007,121,13 2 / g of carbon CECAL3S to prepare. The Pt / C catalyst thus obtained has particles on the order of nanometers (eg 1 to 3 nm) that cannot be detected by DRX analysis. The synthesis of lactic acid in the presence of Pt / C was carried out under the same reaction condi...
example 3
[0044] Example 3: Synthesis of lactic acid according to the method of the invention, and the effect of glycerol concentration.
[0045] The effect of the starting glycerol concentration on the reaction according to the invention as described in Example 1 has been investigated. For this purpose, the conversion of glycerol and the respective glycerol conversion and the resulting reaction of the reaction carried out in Example 1 with a 5% molar concentration of glycerol (reaction a) and the same reaction but with 25% glycerol (reaction b) were determined by kinetic studies. The yield of the product formed. The same batch of catalyst was used for both reactions. For the first reaction a, 100 mL of 5% glycerol was mixed with 1.1 molar ratio of NaOH in the presence of 500 mg of Pt / ZrO2 (1% by weight). The reaction was continued at 180° C. for 25 hours at a helium pressure of 30 bar. The NaOH / glycerol ratio was maintained constant by adding sodium hydroxide. Figure 4 and Fig...
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