16.
Palladium-based catalysts have been widely employed in the electro-Fenton process for
in situ generation of H
2O
2. However, the process is still far from being practical on a large scale. In this work, a series of Cl
xFePd/γ-Al
2O
3/Al catalysts were prepared by a three-step-impregnation method. They exhibited excellent activity in H
2O
2 in situ synthesis and high efficiency in phenol degradation. The characterization results showed that Cl could assist in increasing the content of Pd
0 and reducing the isoelectric point of catalysts, which led to the drastic promotion in the synthesis of H
2O
2. Theoretical calculations further demonstrated that Cl doping could facilitate the main reaction in H
2O
2 synthesis, as well as inhibit side reactions such as dissociation of the O O bond. Furthermore, kinetic models were proposed and fitted. A plausible reaction mechanism as well as degradation pathways were elaborated based on electron spin resonance and gas chromatography–mass spectrometry results. These findings illustrate the value of palladium-based Cl
xFePd/γ-Al
2O
3/Al catalysts for their application in the electro-Fenton process.
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