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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.

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First Claim