W/HAP catalysed N-oxidation of tertiary amines with H(2)O(2) as an oxidant

Synthesis of several N-oxides with tungsten exchanged hydroxyapatite (W/HAP) in the presence of 30% hydrogen peroxide (H(2)O(2)) as an oxidant is presented. A process with aqueous H(2)O(2), a cheap and clean oxidant with an active catalyst is developed to reduce waste production and meet the requirements of green chemistry. Several tertiary amines have been efficiently oxidized to their corresponding N-oxides with excellent yields. The as-synthesized catalyst (W/HAP) is characterized using BET, FTIR, SEM, ICP-OES and XRD. Effect of catalyst loading , temperature and oxidants were studied. A kinetic model has been developed to determine the reaction rate at different temperatures and activation energy for the model reaction. GRAPHICAL ABSTRACT: Synopsis. Synthesis of several N-oxides using tungsten exchanged hydroxyapatite (W/HAP) in the presence of 30% hydrogen peroxide (H(2)O(2)) as an oxidant is presented. A process with aqueous H(2)O(2), a cheap and clean oxidant with an active catalyst is developed to reduce waste production and meet the requirements of green chemistry. [Image: see text] SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1007/s12039-022-02038-0.