Journal
ACS CATALYSIS
Volume 10, Issue 10, Pages 5516-5521Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.0c00725
Keywords
model reaction; 4-nitrophenol; p-nitrophenol; nitroarene; nanoparticles; catalysis; kinetics; mechanism
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Funding
- Australian Government
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We report a reinterpretation of the reduction of 4-nitrophenol catalyzed by silver nanoparticles. Mass spectrometry and ultraviolet-visible light spectroscopy measurements support the existence of 4-nitrosophenol as a stable reaction intermediate. We propose that dissolved oxygen is consumed, both by oxidizing 4-nitrosophenol (an intermediate) and reoxidizing the reduced catalyst surface, resulting in the commonly observed induction period in the reaction kinetics. Upon complete consumption of dissolved oxygen, subsequent reduction to 4-aminophenol can occur. A complete kinetic analysis including modeling is presented, conceptually fitting data from recent reports in the literature, as well as fitting data from our own experiments.
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