Remove humic acid from water quickly using only oxygen and sulfite at nickel cobalt spinel catalyst

Qi, Jing; Cai, Jiabai; Feng, Keqin; Li, Huan

doi:10.1016/j.envres.2023.115209

Cited by 7 publications

(1 citation statement)

References 51 publications

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“…While electronic promoters typically consist of metals and metal oxides, − the incorporation of these species into polyoxometalates (POMs) is not easy due to the complex procedure and potential destruction of the POM structure at higher pH or elevated temperatures during the preparation step . By contrast, inorganic anions, like S 2– , SO 3 2– , I – , and PO 4 3– , can tune the redox properties by simply being added into the solution. − These anions have been reported as potent modifiers on metal sites for improved catalytic performance in oxidation reactions. For example, the inclusion of SO 3 2– formed a complex with Fe sites, subsequently generating SO 4 – · radicals with high oxidizing capabilities for waste degradation. , Inspired by these works, we propose adding anions as promoters to strengthen the reduced Mo sites in PMA.…”

Section: Introductionmentioning

confidence: 99%

Sulfite-Enhanced Aerobic Methane Oxidation to Methanol over Reduced Phosphomolybdate

Wang,

An,

Hülsey

et al. 2024

ACS Catal.

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H 2 -reduced phosphomolybdate (PMA) demonstrated promising aerobic selective methane oxidation activity at room temperature. However, this catalytic system remains limited by insufficient methane activation efficiency at the molybdenum (Mo) sites. Here, we introduce inorganic sulfite anions as a promoter to enhance the H 2 -treated heterogeneous palladium (Pd)-containing Pd/CsPMA catalyst. With the optimal sulfite addition, the methanol productivity was improved by more than 4 times without compromising high methanol selectivity. Spectroscopic techniques and theoretical calculation imply that sulfite serves as a modification ligand, binding to exposed Mo sites from the on-top or bridge locations. This alters the redox properties of PMA, facilitating the creation of more reactive oxygen species for hydrogen abstraction from methane.

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