The damage of fluorine (F) to catalysts in flue gas acid production
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The damage of fluorine (F) to catalysts in flue gas acid production: Fluorine in flue gas exists mainly in the form of hydrogen fluoride (HF). When it coexists with water vapor and silicon dioxide (SiO₂), a chemical reaction occurs that destroys the structure of the catalyst carrier, producing silicon tetrafluoride (SiF₄), which in turn leads to catalyst pulverization, a decrease in conversion rate, and an increase in bed resistance. Since this reaction is reversible, SiF₄ can also undergo a reverse reaction with water vapor to regenerate SiO₂. The newly formed SiO₂ will cover the surface of the active material on the catalyst’s surface, creating a coating that reduces the catalyst’s activity and thus lowers the system’s conversion efficiency.
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It also depends on the catalyst’s tolerance and the moisture in the system; the higher the moisture level, the greater the impact of fluorine. The adverse effects of fluorine also increase when starting and stopping frequently.