Glossary
SCR and SNCR
Corrugated catalyst
Also known as corrugated SCR catalyst, fibre-reinforced catalyst.
A corrugated catalyst uses corrugated ceramic-fibre sheets coated with the active catalytic material, assembled into modules with alternating flat and corrugated layers to form gas-flow channels. The construction is lighter than honeycomb and plate catalysts and is particularly common on tail-end SCR, marine duty and applications where catalyst weight matters.
Where corrugated catalysts fit
- Tail-end SCRs downstream of FGD
- Marine SCR for shipboard NOx control
- Co-generation and industrial duty with weight constraints
- Some HRSG installations
Trade-offs
| Factor | Corrugated | Honeycomb | Plate |
|---|---|---|---|
| Weight per unit volume | Lowest | Highest | Medium |
| Mechanical robustness | Lower | Medium | Higher |
| Surface area | Medium | Highest | Lower |
| Cost | Variable | Lowest (mature supply) | Medium |
Corrugated catalysts are less common in heavy-duty coal and cement SCR but earn their place in specialised duty.
Related terms
Related terms
- Selective Catalytic ReductionSCR is the dominant NOx-control technology on industrial combustion plant. Ammonia is injected upstream of a catalyst that converts NOx to nitrogen and water.
- Honeycomb catalystA honeycomb catalyst is an extruded ceramic block with parallel square channels, the most common SCR catalyst form. High surface area but susceptible to channel pluggage.
- Plate catalystA plate catalyst uses parallel coated steel plates instead of extruded honeycomb. Wider gas channels make it preferred for high-dust SCR duty where pluggage risk is significant.