Oxidation of cyclohexane to adipic acid catalyzed by Mn-doped titanosilicate with hollow structure

• Mn-HTS exhibits high selectivity for the oxidation of cyclohexane to adipic acid.
• The catalyst can be reused and easily separated from the reaction system.
• Using molecular oxygen as oxidant without any initiator and solvent.

One-step oxidation of cyclohexane to adipic acid (AA) was carried out at 413 K over manganese-doped titanium silicalite with hollow structure (HTS) using oxygen as oxidant without any initiator or solvent. The catalyst exhibited high conversion (13.4%) and reasonable product (AA) selectivity (57.5%). Hot-separation and catalyst-recycle tests proved that the catalyst acted as a heterogeneous one and it could be reused four times without losing its activity. The synthesized materials were characterized by N2 adsorption–desorption isotherm, FT-IR, UV–vis and XPS techniques.

Figure optionsDownload as PowerPoint slide