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Taikisha - Catalytic Thermal Oxidizer
A more complex design, the catalytic oxidizer uses a precious metal catalyst, such as Platinum, Palladium, and Rhodium, within the combustion chamber to lower the required reaction temperature. Whereas a direct-fired oxidizer would require temperatures near 1400°F - 1450°F, in the presence of a catalyst, the same reaction can complete at a much lower temperature: 600°F - 650°F. The lower firing temperature requires less natural gas than both a direct-fired and recuperative oxidizer. It also comes in a regenerative catalytic oxidizer design (RCO).
The downside of catalytic oxidizers and RCOs is a higher capital cost and potentially high maintenance costs. The precious metal catalysts are often very expensive and prone to fouling. Once the catalyst is sufficiently fouled, it must be replaced or the reaction temperature must be increased. When selecting an oxidizer, an analysis of VOCs and pollutants must be completed to determine likelihood of fouling.