Catalysts are affected by various factors during use and will lose activity rapidly or slowly. The reasons for catalyst deactivation are complex. Polyurethane CatalystThe editor summarizes the following varieties:
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1. Permanent deactivation
The active components of the catalyst lose their activity due to the effect (poisoning) of some foreign ingredients, usually permanently Sexual inactivation. Most of these foreign components react chemically or ion exchange with the active components of the catalyst, causing changes in the active components. For example, the acidic catalyst is neutralized by alkali, and the precious metal catalyst is poisoned by sulfide or nitrogen compound. Deactivation due to catalyst poisoning usually manifests itself as a rapid decrease in activity. Active components are lost due to wear or sublimation during use, which can also lead to permanent inactivation. This kind of inactivation is usually difficult to recover simply
2. Activity Components are masked and gradually inactivated, right or wrong permanently. For example, carbon deposits generated during the reaction process cover the active components or block the pores of the catalyst, preventing the reactants from contacting the active components. These coverings can be removed through certain methods. If they are deactivated by carbon deposits, they can be resurrected through charcoal regeneration.
3. Incorrect operation leads to catalyst deactivation, such as excessive reaction temperature, severe pressure fluctuations, chaos or destruction of the catalyst bed, etc. What causes catalyst deactivation? This type of deactivation cannot be recovered.
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