How much impact does carbon dioxide have on molecular sieve adsorbents?
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Dear sea friends: Hello, I would like to ask how much impact does carbon dioxide have on molecular sieve adsorbents? Under what conditions can molecular sieves be desorbed, and will this affect their service life?
Carbon dioxide has little effect on molecular sieve adsorbents; reverse flushing and vacuuming are used for desorption
Molecular sieves can easily adsorb carbon dioxide, but their ability to adsorb carbon monoxide is much weaker. Common desorption methods include PSA and VPSA
The adsorption capacity of molecular sieves for carbon dioxide is about three times that for carbon monoxide. Generally, the harder it is for an adsorbent to adsorb a certain component, the more difficult it is to desorb it. In PSA hydrogen production systems, molecular sieves are not primarily used for adsorbing carbon dioxide; if they do absorb it, it will result in hydrogen of unsatisfactory purity.
You are absolutely right; in PSA hydrogen production, activated carbon is primarily used to adsorb CO2, with molecular sieves absorbing a small amount as well. However, it is best to prevent CO2 from penetrating the activated carbon layer, as this could affect the performance of the adsorbent.