STUDY ON SOLID WASTE PYROLYSIS COKE CATALYST FOR CATALYTIC CRACKING OF COAL TAR Bolat A. D. Supervisor: PhD Ospanova G. Suleyman Demirel University bolat.aiken2004@gmail.com Low value solid waste pyrolysis coke has been used as a catalyst for gas-phase tar catalytic
cracking to improve tar yield and gas production. In the process of using direct combustion of coal,
gas pollutants such as NOx and SO2, solid waste will be generated. Direct combustion of coal is not
a method clean disposal.
In recent times, the direct use of coal continues to decline, so it is replacing the development
and use of liquid fuels. But using coal as a source of carbon, it is possible to produce liquid fuels
through processes such as gasification and liquefaction. Liquefaction consists in catalytic cracking
of coal tar into low carbon substances C2-C4 after pyrolysis. Gasification, the process of preparing
combustible gases H2, CH4 and CO, then purify and synthesize liquid fuels.Pyrolysis is a low
temperature dry distillation people's attention because of its low power consumption with high resin
yield. Even low-grade coals with low value can be used to the greatest extent through low-
temperature drying distillation, also can reduce the environmental impact of pollution caused by
low-grade coal storage. A large amount of coal tar in China is in the stage of low processing and
conversion capability. tar is rectified for industry. And according to different distillation ranges,
phenolic oil, naphthalene oil, detergent oil, anthracene, petroleum and asphalt are separated. The
heavy component of asphalt, which accounts for the largest proportion of resin, requires processing
to achieve a high value-added use of resin. Catalytic cracking refers to the process of cracking,
aromatization and other reactions of heavy resin components under the action of a catalyst and heat,
and is converted into gas and light oil products. The reaction temperature is usually below 500°C,
and the coke yield is below than the thermal cracking process. In the study of catalytic tar
upgrading, it was found that metal oxides, molecular sieves, pyrolysis-coke and other catalysts can
improve the quality of tar. But metal oxide-based catalytic materials have the disadvantages of
catalyst poisoning, reduced activity, and heavy metal pollution. Molecular sieve catalysts have
higher low temperature catalytic oxidation activity and even higher conversion rates at room
temperature, but the preparation of a rational process of molecular sieve and activated carbon will
be difficult and expensive.
In addition, pyrolysis coke can realize waste disposal. From the viewpoint of waste disposal
and environmental protection, pyrolysis coke catalyst is the preferred catalyst for catalytic cracking.
«Фараби Әлемі» атты студенттер мен жас ғалымдардың халықаралық конференциясы
10
