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New insights for the mechanism of nitro to amino groups conversion have been revealed on both N-doped graphene and Ag nanoparticles catalysts, based on the paper assisted ultrasonic spray ionization mass spectrometry: (1) water molecules not NaBH4 are the hydrogen source for the reduced amino groups, (2) NaBH4 could contribute to the ionization of H+ from water, facilitating its adsorption on nitro...
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