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CeO2 nanorods supported M–Co bimetallic oxides (M = Fe, Ni, Cu) for catalytic CO and C3H8 oxidation

Liu, Zhongqi, Li, Junhao, Wang, Ruigang
Journal of colloid and interface science 2020 v.560 pp. 91-102
X-ray diffraction, alloys, carbon monoxide, catalysts, catalytic activity, ceric oxide, cobalt, copper, energy-dispersive X-ray analysis, iron, nanorods, nickel, oxidation, oxygen, propane, synergism, transmission electron microscopy
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.