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The Difference Between Cold Catalyst And Photocatalyst #coldcatalyst #photocatalyst
Jan 21, 2019

Nowadays, the technology of air purifiers has been relatively mature. Currently, air purifiers on the market generally use activated carbon nets, HEPA filters, negative ions, electrostatic dust collection, photocatalysts and cold catalyst technology. Today, let’s take a look at the difference between cold catalyst and photocatalyst technology.



The difference between cold catalyst and photocatalyst.


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Cold catalyst is a low-temperature and low-adsorption catalyst. It catalyzes the decomposition of organic compounds in the air with oxygen to produce water and other substances that are harmless to the human body, thereby achieving the elimination of harmful bacteria and carcinogenicity at normal temperature. 


Organic compound the photocatalyst adsorbs organic compounds in the air through the catalyst in the air purifier. 


After the adsorption concentration is full, it must be irradiated by ultraviolet rays (UVC: wavelength 200-275 nm) or dried in the sun for a certain time, so that the adsorbate becomes after water and carbon dioxide, the photocatalyst can restore the adsorption function. In general, there is no big difference between the two, but the work process is different.



Compared with cold catalysts, photocatalysts are also an effective way to solve harmful gas pollution. However, unlike cold catalysts, photocatalysts require adsorbent materials to adsorb and decompose harmful gases. As the use time increases, the efficiency will decrease. Therefore, after using for a period of time, it needs to be exposed to strong sunlight, so that the harmful gas contained in the adsorbent material is decomposed and volatilized. If the exposure is insufficient or not timely, not only the photocatalyst can no longer decompose harmful gases, but also due to harmful substances in the adsorbent materials. The gas volatilizes and causes secondary pollution, and the adsorbed particle suspension can even become a hot bed derived from bacteria. In addition, UVC has the risk of UV leakage and excessive ozone. UVC energy is very strong and it is easy to damage plastic parts. Therefore, from the perspective of safety, the cold catalyst seems to be safer.


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