adsorbent

1. The adsorbent must have a large capacity； 2. The adsorbent should have good selectivity ； 3. The adsorbent must have good mechanical strength ； 4. The adsorbent should have good thermal stability and chemical stability ； 5. The particle size should be appropriate to ensure good contact with the gas ； 6. The price should be low.

One more point: it is easy to handle after adsorption, for example for regeneration, and it generates less pollution.

What is the impact of the shape of the adsorbent on it?

An uneven packing of the adsorbent bed can cause short circuits in the gas path or uneven gas flow distribution, thereby reducing the adsorption efficiency.

The keywords I saw are activated carbon and gas adsorption. Give some actionable advice. A gas adsorption contact time of 0.3–3 seconds is sufficient. At the same time, in the gas adsorption process, the impact of air resistance is a factor that must be taken into account. From this perspective, there are generally 3 options: honeycomb activated carbon, columnar activated carbon, and granular activated carbon. Honeycomb activated carbon is in the form of cubes with a side length of 100 mm, featuring several regularly distributed central pores, which results in minimal air resistance. However, most of the honeycomb activated carbon available on the market is inexpensive, and its actual adsorption performance is inadequate. There are also honeycomb activated carbons with good performance indicators, which require careful selection. Although using the CTC value as an indicator is more reasonable, suppliers are accustomed to using the iodine adsorption value as an indicator. Columnar activated carbon, with coal being the most common material. Diameters of 3 mm and 4 mm are the most common and suitable. The wind resistance is greater than that of honeycomb carbon, but its adsorption capacity is much higher than that of honeycomb carbon (based on common commercially available specifications and when compared on an equal weight basis). Next is flaky or granular coconut shell activated carbon; a particle size of around 4-8 mesh is suitable for this type. Its wind resistance is higher than that of columnar carbon, and its cost is higher than that of columnar carbon. It is mainly suitable for applications with low air flow rates or high strength requirements, and is not appropriate for conventional VOC emission treatment. In summary, columnar activated carbon is the option that makes it easiest to meet VOC emission standards, with the lowest costs for purchase and operation.