The mechanism of metal removal in hydrogenation units
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What is the mechanism by which metals are removed in hydrogenation units?
The mechanism is physical adsorption, which occupies the specific surface area of the catalyst, reduces the contact area between hydrocarbons and the catalyst, and lowers the catalyst’s activity. Once metal adsorption occurs, it is difficult to desorb, resulting in permanent poisoning of the catalyst.
Reply to 2# 2001061713: Is the metal adsorbed after being displaced by hydrogen in a hydrogenation reaction, or is it adsorbed upon coming into contact with the catalyst?
After being reduced by hydrogen, the metal is adsorbed on the surface by the catalyst. Metals can cause permanent poisoning of the catalyst.
Reply to 3# linweihua6: When metal is reduced, it gets adsorbed by the catalyst. The catalyst has a stronger adsorption capacity for this metal than it does for hydrocarbons, preventing the metal from desorbing; as a result, the specific surface area of the catalyst decreases, which constitutes permanent poisoning.
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