Abstract
A series of M3Co16Ox (M = Cr, Ti, Zr, Fe, Mn) oxide catalysts wrapped by polymer nanofilm were developed by the solid-phase method, and the catalytic activities were investigated for low temperature oxidation of carbon monoxide under moisture-rich condition. The catalysts were characterized by HR-TEM, FT-IR, XRD, N2 adsorption-desorption, H2-TPR, CO-TPD and XPS techniques. The results reveal that the M3Co16Ox composite oxides are high-dispersive mesoporous materials coated by polymer nanofilm with an average thickness in the scope of 4–7 nm. The percentages of surface oxygen vacancy and lattice oxygen on the catalysts decrease in the following order: Mn3Co16Ox > Fe3Co16Ox > Zr3Co16Ox > Ti3Co16Ox > Cr3Co16Ox, which is consistent with their catalytic performances. Among all the prepared catalysts, the polymer nanofilm wrapped Mn3Co16Ox nanoparticles possess the highest Co3+/Co2+ ratio (1.56), the highest percentage of surface oxygen vacancy (17.5%) and lattice oxygen (62.2%), resulting in the best catalytic activity, such as, 100% conversion at 55 °C under moisture-rich condition (∼0.6 vol.%). Moreover, the Mn3Co16Ox catalyst also exhibits long-term catalytic stability (>one month) even at a very high water vapor level (3.1 vol.%) and considerably low temperature (85 °C).
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