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

Author:
Liu, Zhongqi, Li, Junhao, Wang, Ruigang
Source:
Journal of colloid and interface science 2020 v.560 pp. 91-102
ISSN:
0021-9797
Subject:
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
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.
Agid:
6729415