CU-CHA / FE-BEA / Fe-MFI MIXED ZEOLITE CATALYST AND METHOD FOR THE TREATMENT OF NOX IN GAS STREAMS
Patent Information
- Application Number
- DE602012081424
- Authority / Receiving Office
- DE · DE
- Patent Type
- Patents
- Current Assignee / Owner
- Priority Date
- 2011-10-05
- Filing Date
- 2012-10-04
- Publication Date
- 2025-03-19
- Estimated Expiration
- 2032-10-04
AI Technical Summary
Existing catalysts for selective catalytic reduction (SCR) of nitrogen oxides in diesel engine exhaust gases face challenges due to high oxygen content, which complicates the reduction of nitrogen oxides, and require rich exhaust gas conditions for ammonia generation, leading to inefficiencies and ammonia breakthroughs.
A catalyst comprising zeolites of the BEA, CHA, and MFI structure types, where BEA-type zeolites contain iron, CHA-type zeolites contain copper, and MFI-type zeolites also contain iron, is used. This catalyst is applied to a monolith substrate in specific loadings and with specific metal loadings to enhance catalytic performance in SCR applications.
The catalyst demonstrates improved catalytic properties, particularly in SCR applications, achieving superior NOx conversion performance under various driving conditions, including those simulated by the New European Driving Cycle (NEDC), while minimizing ammonia slip.