Thermal oxidizers are used as a method of pollution control for process air containing small particles of combustible solids or liquids. Exhaust air in industrial settings may be highly polluted, and it makes sense to oxidize (burn) as much of it as possible so that the exhaust consists of little but non-toxic carbon (soot). Thermal oxidizers are sometimes divided into non-flame oxidizers, which use slow heating to incinerate pollutants, and direct flame thermal oxidizers, which use plumes of flame. Thermal oxidizers may also include a process called catalytic oxidization. In catalytic oxidization, organic compounds pass over a support material coated with a catalyst, commonly a noble metal such as platinum or rhodium, that encourages the pollutants in the air to burn. Catalytic oxidizers can break down pollutants at much lower temperatures than thermal oxidizers lacking catalytic action.
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