CHANGES OF SURFACE CHARACTERISTICS AND PORE SIZE DISTRIBUTION OF PETROLEUM COKE DURING ITS CALCINATION IN THE PRESENCE OF POTASSIUM HYDROXIDE
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Abstract
Change of surface properties and pore distribution in petroleum coke at carbonization stage at 900 °C in presence of potassium hydroxide has been studied. CO2 adsorption and desorption isotherms at 298 K have been obtained for samples of raw and carbonized petroleum coke without and with potassium hydroxide addition. For pore shape and size distribution analysis GCMC (Grand Canonical Monte Carlo) computer simulation method has been used. Regularity of changes in volume, specific surface area and distribution of cylindrical and slit-shaped pores depending on the amount of potassium hydroxide added prior to carbonization stage in petroleum coke has been revealed. Extreme dependence of change in specific surface area and pore volume on potassium hydroxide content in carbonized coke has been identified. It has been found that addition of potassium hydroxide of less than 50% wt. reduces pore quantity and specific surface area of carbonized coke. The main contribution to the coke specific surface area is made by slit-shaped and cylindrical mesopores, as well as cylindrical macropores. It has been shown that by varying the amount of potassium hydroxide added to petroleum coke prior to its carbonization it is possible to regulate the formed pores distribution in terms of shape and size.
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References
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