Heterogeneous catalyst Mn(salicylaldimine) complex covalently bonded to α-titanium phosphate: Synthesis, characterization and catalytic activity for oxidation of cyclohexane

Abstract

<span style="font-size:9.0pt;font-family: " times="" new="" roman";mso-fareast-font-family:"times="" roman";mso-bidi-font-family:="" "times="" roman";mso-ansi-language:en-us;mso-fareast-language:en-us;="" mso-bidi-language:ar-sa;mso-bidi-font-weight:bold"="" lang="EN-US">A new <span style="font-size:9.0pt;font-family:" times="" new="" roman";mso-fareast-font-family:="" "times="" roman";mso-bidi-font-family:"times="" roman";mso-ansi-language:="" en-us;mso-fareast-language:en-us;mso-bidi-language:ar-sa"="" lang="EN-US">heterogeneous catalyst, Mn(salicylaldimine) complex<span style="mso-bidi-font-weight:bold"> covalently bonded to α-titanium phosphate has been synthesized by <i style="mso-bidi-font-style:normal">in situ</i> method and characterized by BET surface area, X-ray diffraction, scanning electron microscopy, energy dispersive X-ray analysis, Fourier transform infrared spectra, X-ray photoelectron spectroscopy and i<span style="mso-bidi-font-style:italic">nductively coupled plasma atomic emission spectroscopy. The catalytic activity of α-TiP.Mn(salicylaldimine) is studied for the liquid phase oxidation of cyclohexane using <i style="mso-bidi-font-style:normal">tert</i>-butylhydroperoxide as an oxidant under solvent-free condition. In the oxidation reaction, cyclohexane is oxidized to cyclohexanol, cyclohexanone and some unidentified products. A maximum conversion (14.75%) of cyclohexane with 91.70% selectivity of KA-oil is obtained at 353 K after 6 h of reaction time. The catalyst can be reused for four cycles without significant loss of catalytic activity.</span></span></span></span>