The reactivity and selectivity of Fenton system (Fe2+/H2O2) were improved with N-hydroxyphthalimide (NHPI) as cocatalyst. The oxidation process of benzyl alcohol to benzaldehyde has been studied. The reaction catalyzed by this new Fe2+/H2O2/NHPI system can be well performed under room temperature without adding any organic solvent. Besides, this catalyst system is effective for the oxidation of different alcohols. 1. Introduction The Fenton reagent is a simple catalyst system which is composed of Fe2+ and H2O2. In the reaction process with Fenton’s reagent, the hydroxyl radicals are generated rapidly at the presence of ferrous ion. This catalyst system is proved to be successful for the treatment of organic pollutants in industrial wastewater [1–12]. There are numerous reports concerning pretreatment option to improve the biodegradability of complex wastes and recalcitrant from industry wastewater and landfill leachate [2–4]. The original pollutants are often transformed to CO2 and H2O due to the strong oxidizing property of the Fenton system [4–7]. In recent studies, Fenton system is coupled with other methods, such as membrane filtration and coagulation, to degrade organic compounds to a larger extent [8, 9]. Besides, the Fenton reagent is also effective in light alcohols and alkane’s oxyfunctionalization [10, 13], but the application for selective oxidation is rare [11, 12]. The Fenton system has wonderful water solubility and there are abundant ferrous irons on the earth. Thus, it is possible to develop a mild and inexpensive water phase oxidation process using this system. Despite its numerous advantages, one limitation of traditional Fenton’s reagent must be taken into account: its high oxygen reactivity, which often leads to deep oxidation [5, 6, 14–16]. To apply the Fenton system in chemical synthesis, the most crucial problem is how to control its reactivity and enhance its selectivity. The efficiency of Fenton’s reagent is affected by various factors, such as pH, the counterion of Fe2+, solvent, iron chelation, UV, and microwaves, which control the oxidation reactivity and regeneration ability of Fe2+ from Fe3+ [4, 17–20]. In addition, it has been found that the additives play a vital role to change the reactivity of Fenton system [13, 21–23]. For example, the reaction with KH2PO4 as additive provided high conversion and good selectivity in the oxidation of benzyl alcohol [13]. The objective of this study is to control the reactivity of Fenton system and enhance its selectivity. Based on a detailed investigation on a series of additives, we
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