Selective catalytic reduction articles and systems

US11724248B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Wen-Mei Xue
• Xiaofan Yang · Knoxville, US
• Haiyang Zhu · Wenhe, CN
• Stanley A. Roth · Yardley, US
• Jeff Yang · Glen Rock, US
• Subramanian Prasad · Edison, US
• Ahmad Moini · Princeton, US

Key dates

• Filing date: Mar 19, 2021
• Grant date: Aug 15, 2023
• Expiry date: Mar 19, 2041

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/12
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The present disclosure relates to copper-containing molecular sieve catalysts that are highly suitable for the treatment of exhaust containing NOx pollutants. The copper-containing molecular sieve catalysts contain ion-exchanged copper as Cu+2 and Cu(OH)+1, and DRIFT spectroscopy of the catalyst exhibits perturbed T-O-T vibrational peaks corresponding to the Cu+2 and Cu(OH)+1. In spectra taken of the catalytic materials, a ratio of the Cu+2 to the Cu(OH)+1 peak integration areas preferably can be ≥1. The copper-containing molecular sieve catalysts are aging stable such that the peak integration area percentage of the Cu+2 peak (area Cu+2/(area Cu+2+area Cu(OH)+1)) increases by ≤20% upon aging at 800° C. for 16 hours in the presence of 10% H2O/air, compared to the fresh state.