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  • Title: CeO2 nanorods supported M-Co bimetallic oxides (M = Fe, Ni, Cu) for catalytic CO and C3H8 oxidation.
    Author: Liu Z, Li J, Wang R.
    Journal: J Colloid Interface Sci; 2020 Feb 15; 560():91-102. PubMed ID: 31654899.
    Abstract:
    Supported bimetallic catalysts with rational compositions and structural design have attracted great interest, due to the tunable structural orientation (alloy or intermetallic compound and core-shell structure etc.), synergetic effects, and combined properties related to the presence of two individual metals. In this study, 10 wt% Fe-Co, Ni-Co and Cu-Co bimetallic oxides with 1:2 atomic ratio (FeCo2Ox, NiCo2Ox and CuCo2Ox) were deposited onto CeO2 nanorods (CeO2NR) via a hydrothermal-assisted precipitation-deposition method. The bimetallic synergism effects, surface structure configuration and the metal (oxide)-support interactions were investigated. The catalysts were characterized by means of powder XRD, TEM, EDX, Raman spectroscopy, XPS, BET surface area, H2-TPR, O2 pulse chemisorption and O2-TPD. All the CeO2NR supported bimetallic catalysts show considerable low-temperature CO oxidation performance. And the catalytic activity toward CO oxidation follows the order: 10 wt% CuCo2Ox/CeO2NR (T50 = 95 °C and T90 = 148 °C) > 10 wt% FeCo2Ox/CeO2NR (T50 = 129 °C and T90 = 193 °C) > 10 wt% NiCo2Ox/CeO2NR (T50 = 147 °C and T90 = 196 °C). As for the catalytic oxidation of C3H8, all the designed catalysts show similar low-temperature performance, but the 10 wt% NiCo2Ox/CeO2NR catalyst exhibits the maximum C3H8 conversion above 330 °C. In addition, we also demonstrate the important role of oxygen storage capacity (OSC) of CeO2NR support and the impact of different oxygen species (physi-/chemisorbed oxygen, and bulk lattice oxygen) on the oxidation of CO and light hydrocarbons.
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