“…[17,27] Structural and chemical changes in the catalyst during the reaction can influence the catalytic performance, therefore, post reaction characterisation is key. [31,47] Ultra-small FeS 2 nanocatalyst was used in four subsequent CNB to CAN hydrogen transfer reactions, with intermediate centrifugation and drying, then analysed via PXRD and FTIR after each reaction to detect signs of decomposition. The recyclability of the nanocatalyst is shown in Fig.…”