Anode Off-Gas Combustion
Anode Off-Gas Combustion
Anode off-gas combustion is a critical function in fuel cell systems where residual fuel components must be safely and efficiently oxidized as part of the overall off-gas treatment strategy. Anode off-gas typically contains hydrogen along with varying amounts of carbon monoxide, methane, ammonia, hydrocarbons, and inert species, depending on fuel cell type, fuel quality, and operating conditions.
As fuel cell systems operate under dynamic load profiles, the composition and energy content of the anode off-gas can vary significantly over time. This places high demands on the combustion solution, which must ensure stable operation, rapid response to transients, and compliance with emission requirements, often without access to support fuel.
Conventional flame-based burners can struggle under these conditions, particularly when handling ultra-lean off-gas streams. Flame stability, limited turndown ratios, increased system complexity, and the need for auxiliary fuel are common challenges when combustion must be maintained across a wide operating window.
Catalytic anode off-gas combustion provides a robust alternative. By enabling flameless oxidation at lower ignition temperatures, catalytic systems allow complete conversion of residual fuel components across highly variable gas compositions. This results in stable combustion behaviour, ultra-low emissions, fast thermal response, and simplified system integration.
CataLite® Burners for Anode Off-Gas Combustion
The CataLite® Burner Series from Catator is specifically designed for catalytic anode off-gas combustion in fuel cell systems. The burners enable efficient oxidation of residual species such as H₂, CO, CH₄, NH₃, and hydrocarbons across a broad concentration range, without the need for support fuel.
Based on Catator’s patented multi-stage CataLite® Coating technology, the burners feature a highly porous and active catalytic layer applied directly to metallic substrates. This ensures strong adhesion, efficient heat transfer, and stable combustion performance even under highly transient operating conditions.
With more than 250 CataLite® Burners delivered for global fuel cell applications, the technology is proven in real-world anode off-gas combustion systems — supporting safe operation, regulatory compliance, and reliable performance as an integrated part of advanced fuel cell system designs.
The photos below show an example of a CataLite® Burner installed for Anode Off-Gas Combustion in a fuel-cell system.
