Why does the catalyst on the ozone filter have a lifespan

Catalyst generally refers to a substance that can increase the rate of a chemical reaction in a chemical reaction, but does not itself participate in the chemical reaction. Theoretically, the lifetime of the catalyst is infinite.




Theoretically speaking, the catalyst means that under the standard test conditions, the gas uses pure ozone, and assuming that the catalyst is free of impurities, the life of the catalyst will be infinitely long; But in normal use, the gas in contact with the catalyst is not "pure", for example: the gas that usually touches our filter screen has nitrogen oxides (Nox) organic volatiles (VOC), etc., so that the catalyst on the filter screen is consumed . Therefore It exhibits a limited lifetime.