What factors affect the service life of ozone catalysts?

The service life of ozone catalysts is affected by many factors, such as the characteristics of the catalyst itself, reaction conditions, pollutant characteristics, and on-site operation and maintenance will affect its service life.
Characteristic of catalyst
Active components: The type, content and distribution of active components will directly affect the performance and life of the catalyst. For example, although the precious metal catalyst has high activity, it has high cost and is prone to poisoning; The activity of transition metal oxide catalysts is relatively low, but the stability is good.
Carrier material: The physical and chemical properties of the carrier are critical to the lifetime of the catalyst. Carriers with high specific surface area, suitable pore size distribution and good mechanical strength can provide more active sites and are not easily broken. Such as alumina, activated carbon and other commonly used carriers, their properties will lead to different catalyst life.
Reaction condition
Temperature: The appropriate temperature range can improve the activity of the catalyst, but too high temperature will lead to sintering and agglomeration of the active component, reduce the specific surface area, and make the catalyst inactive; Too low temperature and slow reaction rate may also affect catalyst performance.
Ph: The pH of the reaction system has a significant effect on the stability and activity of the catalyst. For example, some catalysts have high activity under acidic conditions, and chemical reactions may occur under alkaline conditions, resulting in reduced activity.
Gas flow and concentration: If the gas flow is too large, the residence time of the reactants on the catalyst surface will be too short, and the reaction will be insufficient; The flow rate is too small and the processing efficiency is low. Excessive concentration of the reactants may lead to excessive adsorption on the catalyst surface, blocking the active site and affecting the catalyst life.
Pollutant characteristics
Impurities and poisons: impurities in the raw material gas, such as heavy metals, sulfides, halides, etc., will chemically react with the active components of the catalyst, resulting in catalyst poisoning and deactivation.
Types and concentrations of organic matter: Different types of organic matter have different effects on the catalyst. Some difficult to degrade organic matter may form carbon deposits on the catalyst surface, covering the active site and reducing the catalyst activity. If the concentration of organic matter is too high, the load of catalyst will be too large, and the deactivation of catalyst will be accelerated.
Operation and maintenance
Catalyst loading: If the catalyst particle distribution is not uniform during the loading process, it will lead to uneven gas distribution, local overreaction, and affect the overall life of the catalyst.
Start and stop of the system: Frequent start and stop will make the catalyst undergo drastic changes in temperature and pressure, resulting in thermal and mechanical stress, resulting in the catalyst crushing or loss of active components.
Regular maintenance and testing: Regular testing and maintenance of the catalyst, timely detection of problems and measures can extend the service life of the catalyst. If the catalyst is cleaned and regenerated regularly, part of the activity can be restored.