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Evolution of the kinetic constant for the 4-NP hydrogenation reaction for Pd bimetallic compounds with different amounts of Au and Cu added: (a) the Pd/Au system and (b) the Pd/Cu system. Data refer to the following concentration: 4-NP 9 × 10−5 M, catalyst 1.1 × 10−6 M, NaBH4 0.715 M.
