Atomically Dispersed Pt-Triggered CZO/Cu-SSZ-13 Coupling Catalyst for the Efficient Low-Temperature Selective Catalytic Reduction of NO_x

In this study, an atomically dispersed Pt-loaded Ce0.6Zr0.4O2/Cu-SSZ-13 (Pt-CZO/Cu-SSZ-13) coupling catalyst was fabricated by a facile grinding strategy, and its structure and catalytic performance for the selective catalytic reduction (SCR) of NOx by NH3 were systematically investigated. The results reveal that the resulting Pt-CZO/Cu-SSZ-13 shows outstanding catalytic activity, achieving almost complete conversion of NOx at 145 degrees C, notably lower as compared with that of Cu-SSZ-13 with approximately 100% NOx conversion at 200 degrees C. The reason should be originated from the coexistence of Pt species in both single-atom and nanocluster forms, which not only significantly enhance the reactivity of lattice oxygen in CZO but also considerably increase the number of Br & oslash;nsted acid sites. Both of these factors coordinately aid the adsorption and thereafter the activation of NOx and NH3, and then promote the NH3-SCR activity of the Pt-CZO/Cu-SSZ-13 coupling sample noticeably at the low-temperature range. This study introduces a viable approach to address the pressing issue of NOx emissions during the idle and cold-start phases of diesel engines.