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Cobalt‐Doped K‐OMS‐2 Nanofibers: A Novel and Efficient Water‐Tolerant Catalyst for the Oxidation of Carbon Monoxide

Cobalt‐doped manganese octahedral molecular sieves with an ordered cryptomelane structure (OMS‐2) were synthesized by a one‐step hydrothermal method. The cobalt precursor was directly added into the solution before crystallization to allow its incorporation into the mixed‐valent framework of K‐OMS‐2. The structure, redox properties, and surface hydrophobicity of Co‐doped K‐OMS‐2 were examined by X‐ray diffraction, FTIR spectroscopy, Raman spectroscopy, SEM, TEM, N2 sorption, temperature‐programmed reduction by H2, X‐ray photoelectron spectroscopy, and water contact‐angle system. The incorporation of Co induced a morphological change in K‐OMS‐2 from nanorods to nanofibers and an increase in the specific surface area from 70.6 to 188.3 m2 g−1. Co‐doped K‐OMS‐2 was shown to be able to completely convert CO at 100 °C in the presence of approximately 3 % water vapor. The promotion effect of Co on the catalytic activity is believed to originate from the enhanced redox capacity and surface area of K‐OMS‐2, whereas the improved surface hydrophobicity may induce superior water‐tolerant performance.