Analysis and discussion on catalyst deactivation
In chemical theory, the catalyst is never consumed and can be used all the time. However, in practical applications, we found that the catalytic effect of the catalyst is continuously declining, until the reaction rate is reduced to an unacceptable level, the catalyst is scrapped. At this time we think that the catalyst is deactivated. Why does the theoretically never consumed catalyst deactivate? The following is an analysis and discussion on this issue.
Theoretically, the catalyst is not consumed, which means that the quality of the catalyst before and after the entire reaction is equal, which does not mean that the intermediate does not participate in the reaction. The essence of the catalyst is to change the original reaction path and reduce the activation energy of the chemical reaction. The catalyst participates in the reaction during the reaction, and then recovers itself, so it does not seem to be consumed. In the actual chemical reaction, the catalyst will be lost, poisoned, aging and other phenomena, so that the activity of the catalyst will continue to decline, resulting in the deactivation of the catalyst.
In the reaction process, along with the process of mass transfer and heat transfer, the catalyst receives mechanical shock and thermal shock, and the mechanical structure will gradually change, and the specific surface area will decrease, pulverize, fall off, etc., which directly cause the effective components of the catalyst to decrease.
The chemical raw materials for the reaction often contain some impurities. These impurities can combine with the active sites of the catalyst and occupy the active sites of the catalyst, thereby causing the activity of the catalyst to decrease. This is the poisoning reason of the catalyst. Catalyst poisoning is the most common and most influential in chemical engineering. In order to prolong the service life of the catalyst as much as possible, it is usually necessary to adopt various methods to purify the reaction raw materials, or to increase the reaction temperature, etc., to minimize the probability of catalyst poisoning.
The aging of the catalyst is very complicated. During the use process, the catalyst itself will undergo oxidation, dehydration of crystal water, deliquescent and other phenomena, which will cause the activity of the catalyst to gradually decrease, and the high-intensity use load will accelerate the aging process of the catalyst.
The gradual deactivation of the catalyst is inevitable. In order to prolong the service life of the catalyst as much as possible, minstrong
has continuously optimized the production process of the catalyst based on experience after years of exploration, from chemical synthesis, structural shaping, catalyst activation, packaging and transportation, etc. Continuous improvement in all aspects, and strive to provide customers with high-quality catalysts with stable quality and high catalytic activity.
Hunan Minstrong Technology Co., Ltd. specializes in the production of carbon monoxide catalyst, CO catalyst, VOC destruction catalyst, ozone O3 destruction catalyst, Hopcalite
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