Thermally stable high-loading single Cu sites on ZSM-5 for selective catalytic oxidation of NH₃.

ABSTRACT: Rigorous comparisons between single site- and nanoparticle (NP)-dispersed catalysts featuring the same composition, in terms of activity, selectivity, and reaction mechanism, are limited. This limitation is partly due to the tendency of single metal atoms to sinter into aggregated NPs at high loadings and elevated temperatures, driven by a decrease in metal surface free energy. Here, we have developed a unique two-step method for the synthesis of single Cu sites on ZSM-5 (termed Cu_S/ZSM-5) with high thermal stability. The atomic-level dispersion of single Cu sites was confirmed through scanning transmission electron microscopy, X-ray absorption fine structure (XAFS), and electron paramagnetic resonance spectroscopy. The Cu_S/ZSM-5 catalyst was compared to a CuO NP-base

SUBMITTER: Chen L 

PROVIDER: S-EPMC11295017 | biostudies-literature | 2024 Jul

REPOSITORIES: biostudies-literature