SSZ-13 zeolite catalyst or SSZ-13 molecular sieve, is a synthetic aluminosilicate zeolite with a CHA (Chabazite) framework structure. Characterized by its unique three-dimensional eight-membered ring pore system with an effective pore opening of approximately 0.38 nm, SSZ-13 has become one of the most important zeolite materials in environmental catalysis.
SSZ-13 zeolite catalyst is particularly renowned for its application in selective catalytic reduction (NH₃-SCR) of nitrogen oxides (NOx) from diesel engine exhaust, where it has become the benchmark material for modern emission-control catalyst systems worldwide.
The unique pore architecture of SSZ-13 zeolite catalyst allows small molecules such as NH₃, NO, NO₂, H₂O, and O₂ to diffuse efficiently through the catalyst while restricting the access of larger hydrocarbon molecules and certain sulfur-containing species. This makes it highly suitable for harsh exhaust treatment environments.
Copper-exchanged SSZ-13 (Cu-SSZ-13) zeolite is the most widely used SCR catalyst for diesel vehicle emission control. The isolated Cu ions located within the CHA cages serve as highly efficient redox active centers, promoting the conversion of harmful nitrogen oxides into environmentally harmless nitrogen and water through reactions with ammonia. It has become the industry-standard catalyst for meeting stringent emission regulations such as Euro VI, China VI, and EPA heavy-duty diesel standards.
Iron-modified SSZ-13 (Fe-SSZ-13) zeolite catalyst has also attracted significant interest due to its superior high-temperature SCR activity and enhanced sulfur tolerance in certain operating conditions. Depending on the application requirements, different metal-exchanged forms of SSZ-13 can be optimized to achieve the desired balance between low-temperature activity, hydrothermal stability, and resistance to catalyst poisoning.
| Type | SSZ-13 |
| Apprearance | White powder |
| Crystal Structure | CHA |
| Crystal Size(μm) | 0.2~3.0 |
| BET Surface Area(m2/g) | ≥500 |
| SiO2/Al2O3(mol/mol) | 10~30 |
| Na2O(wt%) | ≤0.05 |
| Cation Form | Na, Cu, H, Fe (Customizable) |
* Environmental NH3-SCR Denitrification Catalyst
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