What is Impregnated activated carbons and what it is used for ?

Porous carbons containing several types of inorganic impregnate such as iodine, silver, cations such as Al, Mn, Zn, Fe, Li, Ca have also been prepared for specific application in air pollution control especially in museums and galleries.

Impregnated activated carbons are carbonaceous adsorbents which have chemicals finely distributed on their internal surface. The impregnation optimizes the existing properties of the activated carbon giving a synergism between the chemicals and the carbon. This facilitates the cost-effective removal of certain impurities from gas streams which would be impossible otherwise. For environmental protection, various qualities of impregnated activated carbon are available and have been used for many years in the fields of gas purification, civil and military gas protection and catalysis.

Through a suitable impregnation, the adsorption capacity of the activated carbon can be increased considerably, for economic collection of several hard to adsorb gas pollutants such as hydrogen sulphide, mercury or ammonia.

Typical impregnation chemicals are sulphur (for the removal of mercury), potassium iodide (H2S, AsH3, radioactive isotopes), potassium carbonate (HCl, HF, SO2) and silver (for drinking water treatment).

Due to its antimicrobial and antiseptic properties, silver loaded activated carbon is used as an adsorbent for purification of domestic water. Drinking water can be obtained from natural water by treating the natural water with a mixture of activated carbon and Al(OH), a flocculating agent. Impregnated carbons are also used for the adsorption of Hydrogen Sulfide(H2S) and thiols. Absorption rates for H2S as high as 50% by weight have been reported.


KOH, or NaOH impregnated activated carbon, FCK series are  kinds of pelletized activated carbon for Respirators and Human protection. In the simplest terms, KOH, or NaOH impregnated activated carbon does double duty: First it grabs the contaminants and then it turns them into something harmless. Accordingly it is ideal for respirator applications. Because impregnated carbon attracts and holds contaminants both physically and chemically.

The activated carbon itself can be used as a catalyst, and its selectivity and conversion rate can reach or exceed the performance of the traditional catalysts supporting the precious metal. In addition, the production cost of catalysts is greatly reduced because the precious metal is not required, and the recovery procedure of used catalysts is simplified, so carbon catalysts have been widely used in various industries.

Non-military applications for impregnated carbon include:

A. Manufacturing of personal protection and first responder masks.
B. Individual gas mask filters.
C. Collective protection filters.
D. Sulfur compounds removal, including H2S, Sulfur based alcohol, SO2, dimethyl sulfide, methyl sulfide, mercury vapor, NH3, etc.
E. Automotive cabin air purification systems.
F. Mercury Removal
G. Odor control
H. Precious metal catalyst carriers
I. home water treatment in bacteriostatic water filters
J. removal of war gases from NBC filters and gas masks (pursuant to international standards such as CEN and NIOSH)
K. ammoniac and amines removal from air.

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