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Schematic illustration of preparation as well as catalyt ic application of Pd-Cu bimetallic composite materials (BCM): prepared Pd seed and Pd nanocrystals (a); prepared Pd-Cu composites (b); catalytic reduction test of Pd-Cu composites (c); ball-and-stick molecular model of 2-NA, OPD and 4-NP,4-AP, respectively (d).
