Controlled synthesis of Pd/CoOx–InOx nanofibers for low-temperature CO oxidation reaction

Abstract

Herein, we report a series of Pd/CoO_x–InO_x nanofibers with different morphologies (such as nanofibers, porous nanofibers and bead-like nanofibers) via electrospinning, annealing and impregnation methods. The Pd/CoO_x–InO_x-500 sample, which was annealed at 500 °C, exhibited the best CO performance with T₉₀ = 57 °C. The samples were characterized via SEM, BET, TEM, XRD, H₂-TPR, CO-TPR, FT-IR, Raman spectroscopy and XPS. According to the results, the Pd/CoO_x–InO_x-500 catalyst possessed the largest surface area, highest dispersion and smallest size Pd species compared to that of Pd/CoO_x–InO_x-600 and Pd/CoO_x–InO_x-700. Thus, the Pd/CoO_x–InO_x-500 catalyst can be considered a promising candidate for CO oxidation.