SCR (Selective Catalytic Reduction) catalyst is the core component of the exhaust denitration system. It enables selective reaction between ammonia and nitrogen oxides at a suitable temperature, converting harmful NOₓ into harmless nitrogen and water vapor.
Reaction equation:
CO(NH2)2 + H2O → 2NH3 + CO2
8NH3 + 6NO2 → 7N2 + 12H2O
4NH3 + 4NO + O2 → 4N2+6H2O
2NH3 + NO + NO2 → 2N2+3H2O
Characteristics of Common Types of SCR Catalysts:
|
SCR Catalyst |
Low temp |
Medium temp |
High temp |
| Catalyst Type |
CuO-SCR |
VWT-SCR |
Fe-Zeolite |
| Heat resistance |
180-500 |
200-450 |
350-550 |
| Optimal temp |
200-280 |
280-420 |
400-530 |
| Sulfur resistance |
Low |
High |
Fuel sulphur content ＜25ppm or tail gas containing sulfur ＜ 2ppm |
| Aging resistance |
High |
Lower |
High |
| Maximum DeNOx efficiency |
＞98% |
＞98% |
＞98% |
Coated SCR Configuration:
All three figures above feature a single-layer structure
NOₓ Conversion Curves for Catalysts at Different Temperatures:
Typical Catalyst Configurations：
Plate-type Catalyst
Honeycomb-type Catalyst
SCR Catalyst Configuration:
Catalyst selection: Customers can choose different types and formulations of catalysts according to different application scenarios.