The impregnation process of pellet activated carbon is a key technology that loads functional substances into the pores of the carbon body through physical or chemical methods.
The core process can be divided into three steps: Firstly, the pellet carbon is placed in the impregnating liquid, and vacuum suction is used to ensure that the solution fully penetrates into the microporous structure; Subsequently, the impregnating agent is solidified through high-temperature calcination (typically 300-600℃), for instance, the zinc chloride activation method can form catalytic sites for metal oxides.
Finally, acid-base washing is adopted to remove the residue and ensure the purity of the carbon body. This process can precisely endow activated carbon with specific functions by regulating three major parameters: the concentration of the impregnating agent, temperature and time. For instance, loading lithium iron phosphate can enhance the conductivity of the electrode, or loading silver ions can improve the antibacterial performance. This directional modification technology enables pellet carbon to achieve performance breakthroughs in fields such as sewage treatment, air purification and energy storage.
https://www.naturecarbon.com/coal-based-activated-carbon/sulfur-impregnated-activated-carbon.html
