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Ermagambet Bolat

Title: The development of catalyst based on mineral part of shale for fisher-tropsh synthesis

Ermagambet Bolat

Institute of Coal Chemistry and Technology, Kazakhstan


Ermagambet  B.T. - Doctor of Chemical Sciences, academician of the International Academy of Informatization, director of "Institute of Coal Chemistry and Technology" (Astana). He has more than 250 scientific publications, 5 monographs, 1 textbook, more than 20 copyright certificates, patents of RK. Under his leadership defended 3 PhD, 1 doctoral and 20 master's theses.


The products of the Fischer-Tropsch synthesis have a great practical importance due to the fact that they contain many alkanes, isoalkanes and olefins, predominantly of a normal structure. The development of cobalt catalysts for the synthesis of aliphatic hydrocarbons from CO and H2 of the new generation is very topical and includes the study of new supports, catalytic compositions, and the conditions for their formation. Promising catalysts include systems on a cement (alumo-calcium) basis, which are characterized by high activity and productivity, as well as mechanical strength.
The shale rocks can be used as the source of the supports, which are available in Kazakhstan in sufficient quantities for their industrial use. In this regard, the creation of fundamental and technological fundamentals for the acquisition of new materials (carriers) is of particular relevance.
A new catalytic system for FT synthesis using the ash part of the Kendyrlyk oil shale deposit (Kazakhstan) as a support has been developed. The ash part of the shale was impregnated in a water bath at 50-600 ° C with an aqueous solution of Co(NO3)2 * 6H2O cobalt nitrate and zirconium oxonitrate ZrO(NO3)3 * 2H2O, which was used as a promoter. It was then dried in air at 100 ° C and calcined at 450 °C in an inert atmosphere on the Thermostep Eltra.
The elemental composition, structure and dimension of the catalyst were studied by energy dispersive X-ray spectroscopy using a SEM device (Quanta 3D 200i) with an attachment for energy dispersive analysis from EDAX. The results of the analysis show the following elemental composition of the catalyst (mass%): C 2.66, O 30.90, Na 0.60, Mg 1.03, Al 4.57, Si 20.18, Zr 12.37, K 1.57, Ca 7.24, Fe 3.51, Co 10.38. Elemental analysis confirms the content of active metals in the catalyst Co (10%)/Zr (1%). SEM images of the synthesized catalyst indicate that the size of the cobalt particles deposited on the shale ash varied from 200 to 330 nm. A more uniform structure of the carbon support is obtained after impregnation. The catalyst was reduced at 3500C in hydrogen medium at a space velocity of 300 h-1 (volume flow 4.2 cm3/s).
Catalytic tests using the obtained catalyst based on ash from shale were tested on a laboratory installation for the synthesis of liquid hydrocarbons (FT synthesis) at a pressure of 10 atm and a temperature range of 180-220°C.
Synthesis was carried out in a working medium of a mixture of H2 and CO with a volume ratio of 2/1 at a temperature of 180 to 240 ° C and a space velocity of 500 h-1 (volumetric flow rate of 7 cm3/s). The analysis of gaseous and liquid products was carried out with GC1000 Chromos gas chromatography apparatus. The results of the analysis show the formation of hydrocarbons C1-C4, C5-C20 (2.4-dimethylheptene-1 -22.8%, 1.1 and 1.2-dimethylindane-13.01%, tridecene-1.33%, etc.), whose formation occurs mainly in the direction of methane production CH4. The maximum yield of CH4 (25.76%) is observed at a temperature of 236°C.
Thus, a new catalyst based on cobalt deposited on the ash of the Kendyrlik oil shale was presented. The catalyst has active properties and allows the production of synthetic hydrocarbons. This catalyst can be used in the methanation of synthesis gas to produce methanil fuel gas. As a result of the study it was found that a support based on ash from shale provides mechanical strength, high dispersion of the obtained catalyst and can be used in the catalysis of numerous chemical processes.