The correct time to inject any inert gas during the chemical activation process for activated carbon should be 30 minutes before warming up the furnace. This timing is crucial to ensure that the tube furnace is free of oxygen gas, thus preventing any combustion processes from occurring. Further, the N2 gas injection should continue until the temperature of the furnace drops below 200°C.

N2 is injected during the thermal degradation process, as it is a pyrolytic process, the N2 is removed from the oxygen, the N2 is present from the beginning of the heating process.

Dear Habibollah Younesi ,

Thank you so much for your helpful answer, If you could help me answering another question, How much water is typically used during the impregnation step? is there any relationship between the weight of carbon and the amount of water?

Dear Morayma Angelica Muñoz ,

Thank you so much for your informative reply, If you could help me answering another question, How much water is typically used during the impregnation step? is there any relationship between the weight of carbon and the amount of water?

Hi there,

The total amount of water required for the impregnation process depends on the weight of the carbon resource and the specified water content percentage for the activation procedure. For example, a water content of 10% may be sufficient to create a homogeneous slurry of the carbon resource and alkali-activated agent. If the water content is insufficient, additional water must be incorporated to achieve a uniform slurry consistency.

In the case of an acid-activation agent required for impregnating carbon resources during acid activation, the necessary concentration of the acid-activation agent can be calculated based on the weight of the carbon resource or the specific surface area targeted for activation. The amount of acid-activation agent needed is similar to that of an alkali-activation agent to achieve a uniform slurry during the impregnation process.

thank you, Habibollah Younesi ,Could you provide a hint on the meaning of the 10% water content, how it is calculated?

thanks alot,

Hi there

Water amount = weight of carbon resource X 0.1

As mentioned above, if that is insufficient, additional water must be added to achieve a uniform slurry consistency. Please ensure that the alkali is dissolved in water before adding it to the carbon resources.

noted, thank you Habibollah Younesi

Hi Oussama Khiter, the amount of water used in the activation depends on the type of activation you are going to use. If it is the case of alkaline way, it depends on the carbon/alkali ratio you use, as you will need more or less depending on the amount of hydroxide you use, this amount should be enough to generate a solution of alkali in water.