In heterogeneous catalysis, single-atom catalysis has probably become the most active new field. We now have a huge number of single-atom catalysts (SACs) that display different performances for a wide range of chemical processes, thanks to recent developments in practical synthesis procedures, characterization methods, and computational modeling. Because SACs have well-defined active centers, they provide the unique potential for rationally designing novel catalysts with high activity, selectivity, and stability. Indeed, given a specific practical application, we may frequently construct an appropriate SAC; as a result, the area has progressed quickly and provided promising catalytic leads.<br/>The method newly developed at UofSC for the synthesis of SACs via chelate fixation (CheFi) provides a simple, scalable pathway for the synthesis of Bimetallic catalysts with mixed metal sites, in close enough proximity to exhibit the desired bimetallic effect.<br/>Based on prior studies, we anticipated that water in the hydration sheaths of dried precursors induces agglomeration of even electrostatically bound precursors after drying, resulting in the production of metal particles. An organic chelating agent is administered immediately after the precursor's incipient impregnation stage to alleviate this problem. The Chelating chemical, we believed, would attach the metal precursor to the support surface, preventing precursor aggregation during drying. Figure 1 depicts the schematics of this method, which we call chelate fixation (CheFi). The efficiency of the CheFi approach for creating a series of structure-well-defined Bimetallic SAC supported on Norit-Carbon was demonstrated in this study by comparing conventional synthesis methods with our novel method. Scanning Transmission Electron Microscopy was employed (STEM). The STEM pictures of two Bimetallic catalysts are shown in Figure 2.

Bimetallic single-atom catalysts via chelate fixation participants

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