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Doped Activated Carbon

What is doped activated carbon?

Doped activated carbon is an innovative filter media designed to maintain the valuable inner surface and microporous structure of the activated carbon. This makes it highly effective at removing hydrogen sulfide (H2S). 

During our manufacturing process, doped activated carbons undergo a treatment that aims to change its properties. The treatment not only maintains the outstanding adsorption capabilities of the activated carbons, but also incorporates specific catalysts tailored for efficient desulfurization. 

This method replaces additional impregnation in the production stage and substantially improves the H2S removal characteristics of the carbon compared to traditional impregnated activated carbon. During production, these crucial catalysts are integrated into the activated carbon, ensuring an even distribution within every pellet. This approach also leaves the micropores untouched, preserving their capacity for both physical adsorption and chemical reactions.  

What’s the difference? 

Activated carbons commonly used for desulfurization are often treated with compounds such as potassium iodide— which is placed afterwards in the pore structure— in order to enhance their capacity to adsorb H2S. Yet, the impregnation process impacts a significant portion of the internal surface area, which also impacts the functionality of the crucial micropores. Unfortunately, these micropores hold the highest potential for adsorbing H2S found in biogas. 

Advantages of using doped activated carbon 

Doped activated carbon offers significant advantages compared to impregnated carbons. Its lower bulk density reduces the need for frequent refills, while the larger micropore volume boosts its sulfur loading and adsorption potential. 

The higher sulfur loading capacity extends time between service intervals since the activated carbon does not need to changed as often. It also slows H2S breakthrough, providing more reaction time or allowing for a timely activated carbon replacement. The special catalyst also creates an ideal environment for accelerated chemical reactions, ensuring efficient filtration across operating conditions.