| Deactivation of catalyst |
| In the process of using a variety of factors in the impact of various factors, will be a sharp or slow loss of activity. The reason for deactivation of catalyst is complex. Can be summarized as the following types: 1 permanent inactivation The active component of the catalyst loses its activity by the action of some foreign components (poisoning), which is often lost in the activity of the catalyst. These foreign elements are mostly related to the active component of the catalyst, which is the result of chemical reaction or ion exchange, which leads to the change of the active component. If the acid catalyst is alkali neutralization, the noble metal catalyst is poisoned by sulfur compounds or nitrogen compounds. Deactivation of catalyst poisoning often showed a rapid decline in activity. Loss of active components in the use of the process is worn or sublimation also leads to permanent inactivation, which is often difficult to simply restore the loss of life 2, the active component is covered and gradually lost, is a non permanent inactivation. In the process of carbon deposition, the active component or blocking the pore of the catalyst can not be contacted with the active component. The cover can be removed by some methods, such as by carbon deposition and deactivation can be raised through regeneration. 3, the wrong operation led to deactivation of the catalyst, such as excessive reaction temperature, pressure fluctuations lead to the catalyst bed chaos or crushing, etc., this kind of deactivation is unable to restore the. |
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