Influence of coal type on pore structure of honeycomb activated carbon

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Influence of coal type on pore structure of honeycomb activated carbon

#1 dingxinda9

Advanced Member

Group: Members
Posts: 46
Joined: 29-October 20

Posted 21 February 2021 - 10:13 PM

The adsorption isotherms of Datong coal honeycomb activated carbon samples show the characteristics of microporous materials and belong to type I isotherms, indicating that the pore structure of these honeycomb activated carbons is mainly microporous. The honeycomb carbonized material made from Datong coal is characterized as a non-porous material.

As the activation degree increases, the adsorption capacity for nitrogen increases accordingly. When the activation ignition loss is greater than 28%, the adsorption isotherm is less than 0.1 at the relative pressure. yongruida carbon The curvature of the bend becomes larger, indicating that the distribution of micropores gradually widens, and some small diameter micropores are transformed into large diameter micropores. In addition, after the relative pressure is greater than 0.9, these adsorption isotherms show an upward trend, indicating that the number of mesopores and macropores also increases.

The adsorption isotherm of Shenmu coal-made honeycomb activated carbon presents an IV isotherm. Compared with Datong coal-made honeycomb activated carbon, the adsorption capacity caused by capillary condensation increases sharply after the relative pressure is greater than 0.9, and the adsorption capacity does not show adsorption saturation. It shows that there are a large number of mesopores and macropores in the honeycomb activated carbon made from Shenmu coal.

The specific surface area and total pore volume of honeycomb activated carbon calculated from the adsorption isotherm, with the increase of activation time, the total pore volume and specific surface area of the two types of coal-made honeycomb activated carbon increased differently. wholesale activated carbon pellets It shows that the activation reaction of water vapor and carbon, on the one hand, opens the closed pores during the carbonization process, on the other hand, it also generates new pores. The honeycomb activated carbon made from Datong coal is higher than that of Shenmu coal.