Currently, one of the most pressing issues is the search and development of ways to obtain alternative environmentally friendly fuel sources. One of the promising and widely discussed directions in the scientific community is the reaction of deoxygenation of fatty acids obtained from vegetable raw materials. Such biofuels can be used both independently and in a mixture of petroleum products.
This work continues the research cycle in this direction, the purpose of which is to search for optimal conditions for the process with a high yield of the target product. The process consists of two stages: hydrolysis of vegetable oils with the release of a fraction of fatty acids; and deoxygenation of the resulting fatty acids with the formation of hydrocarbons corresponding in composition to bio-aviation kerosene. Next, we consider the stage of deoxygenation of fatty acids using various types of industrial catalysts.
The deoxygenation reaction is carried out in a mixing reactor at a pressure of 30-50 ATM and a temperature of 320-340 ° C in the presence of three different industrial catalysts Pd/act, Co-Mo/Al2O3, Mo-Co/Al2O3 oxides, in the amount of 1-2% by weight of the total mass of reagents, the mass ratio of fatty acids: cetane = 3:7 for 3-5 hours. Also, in the course of this study, the influence of dispersion of the catalyst on the yield of the product is considered. Table 1 summarizes the best results of the conducted experiments:
Catalyst P, atm T, ºC Time, h Conversion, %
Pd/Cact 30 330 3 30
Co-Mo/Al2O3 40 330 3 32
oxides of Mo-Co/Al2O3 40 330 3 14.7
As a result of studies, the conversion of fatty acids is 32% and is achieved at a partial pressure of hydrogen 40 ATM in the presence of a finely dispersed catalyst Co-Mo/Al2O3. At the same time, it was found that the presence of a solvent, as well as the degree of dispersion of the catalyst, have a significant effect on the conversion parameter.
Further research is aimed at finding new catalytic systems of the deoxygenation stage that allow increasing the yield of the kerosene fraction, as well as eliminating expensive catalysts based on precious metals.
List of used literature:
1. Zhao C., Bruck T., Lercher J.A.// Green Chem.2013. V. 15. N 7. p.1720 - 1739.
2. Mortensen P.M., Grunwaldt J.-D., Jensen P.A.//Appl. Catal. Ser.A. 2011. V. 407. N 1, p.1-19.
3. Choudhary T.V., Phillips C.B.//Appl. Catal.Ser.A.2011. V.397 N 1. p. 1-12.
4. De Sousa F.P., Cardoso C.C., Pasa V.M.D.//Fuel Processing Technology. 2016. V.143, p.35-42
|Publication||IOP Conference Series: Earth and Environmental Science|
|Affiliation of speaker||Zolotarea Marina|