Catalyst specific surface area
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Why do high temperature, high moisture, and low oxygen levels cause a decrease in the specific surface area of reforming catalysts?
Specific surface area is the sum of the internal and external surface areas of the catalyst; when moisture comes into contact with a high-temperature catalyst, it vaporizes rapidly, causing thermal degradation of the catalyst. Turn into dust. As for hypoxia. It’s because the burning was not sufficient, which prevented the catalyst from being fully regenerated; residual coke remained on it, reducing the catalyst’s specific surface area
My skills are limited! I don’t have enough knowledge about catalysts; how can I understand high temperatures?
Any catalyst has a maximum temperature it can withstand; beyond this temperature, high-temperature sintering occurs, reducing the catalyst’s surface area. For reforming catalysts, the temperature generally should not exceed 700°C, as this can lead to the melting of Al2O3 and the disruption of its crystal structure, thereby reducing the surface area of the catalyst.
Well, just as the temperature for the catalyzed reaction is 522 degrees, which is considered a high temperature, any water present in the raw materials can cause the catalyst to fail thermally
A friend from the Institute of Rock Mechanics has written papers on this topic, but I guess you wouldn’t be able to understand them, and I don’t recommend that you try to do so. The work written by doctors is highly theoretical; all you need to know is that this phenomenon occurs in high-temperature and high-water environments, but it has nothing to do with low oxygen levels.
The effective gamma-phase crystal form of high-temperature download body alumina will undergo sintering transformation. These changes represent irreversible damage that results in a significant reduction in the sintering active area of the carrier. Therefore, when operating the CCR, care must be taken to avoid overheating; in addition, it is necessary to guard against localized high temperatures caused by poor circulation in the combustion zone.
Could you send me the paper from my friend at the Institute of Geosciences? 563978327@qq.com Also, why is the specific surface area of the catalyst unrelated to low-oxygen operation? Thank you
High temperatures, water vapor, and low oxygen directly damage the internal structure of the catalyst, resulting in significant changes to its surface area.
High temperature. Water vapor can cause thermal collapse of the catalyst, which is something that must be avoided at all costs when operating in the catalysis workshop of our factory – be extremely careful!
I need this paper from the Institute of Rock Mechanics; please study it. Thank you! mailto:490367304@qq.com