TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The metal catalyst is compound containing transition metal, preferably iron, copper, nickel, vanadium, chromium and/or manganese or noble metal salt containing platinum, rhodium, palladium, gold and/or ruthenium, preferably ferric sulfate, copper sulfate, silver chloride, platinum chloride and/or ammonium vanadate. The radical initiator is hydrogen peroxide or ozone.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The volatile organic compounds are ethanol, methanol, alcohol, aldehyde ethyl glycol. Preferred Method: In the step (i), 0.01-30 pts. wt. glycerol based on the weight of the total solution is dissolved in water. In the step (ii), the addition amount of the metal catalyst is 0.01-5 pts. wt., based on the total weight of the mixture. In the step (iii), the addition amount of the radical initiator is 0.1-30 pts. wt., based on total weight of the reactant mixture. In the step (iv), the reaction temperature is 10-300 degrees C, preferably 80-300 degrees C, and the reaction pressure is 0.1-1000 mbar, preferably 100-500 mbar. In the step (v), the condensation is performed at -40 to 25 degrees C. The method further comprises removing the generated volatile organic compounds to increase the reaction speed and maintain reaction direction. The preparation of volatile organic compounds, comprises (a) dissolving 0.01-30 pts. wt. glycerol based on the weight of the total solution in water; (b) adding 0.01-0.1 pts. wt. ferric sulfate to the obtained glycerin solution; (c) adding 0.1-0.5 pts. wt. hydrogen peroxide to the mixture obtained in the step (b), reacting at room temperature for 1-10 hours; (d) vacuum the reaction product under pressure of 100-500 mbar at 50-100 degrees C using rotary vacuum distiller to obtain vapors; and (e) condensing the vapors at -40 to 25 degrees C to obtain methanol as main product and aldehyde or glycol by-product. The step (c) further comprises the step of batching the reactant in an electric furnace at 100-300 degrees C for 1-10 hours. EXAMPLE - 6.3 ml Ferric sulfate solution (obtained by dissolving 15.48 g ferric sulfate in 1l water) was added to 270 ml glycerol solution. Then 30 ml 30% hydrogen peroxide solution was added to the resultant solution and reacted for 6 hours. The reaction product was introduced into electric muffle furnace in 100 ml solution batches and reacted for 6 hours at 150 degrees C, 200 degrees C and 250 degrees C, cooled and vacuum distilled at 90 degrees C under pressure of 300 mbar and the obtained vapors were condensed at -5 degrees C to obtain volatile organic compounds.