Co3 O4 -CeO2 Nanocomposites for Low-Temperature CO Oxidation.
Jingxia Yang1,2, Nevzat Yigit1, Jury Möller1
1Institute of Materials Chemistry, Technische Universität Wien, Getreidemarkt 9/BC/01, 1060-, Vienna, Austria.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|April 29, 2021
Summary
Cobalt oxide (Co3O4) and cerium oxide (CeO2) nanocomposites were synthesized for CO oxidation. CeO2-supported Co3O4 layers showed superior performance, significantly lowering the light-off temperature.
Area of Science:
- Materials Science
- Catalysis
- Nanotechnology
Background:
- Combining cobalt oxide (Co3O4) and cerium oxide (CeO2) can leverage their catalytic properties.
- Nanocomposites offer tunable properties for enhanced chemical reactions.
Purpose of the Study:
- To synthesize and evaluate Co3O4-CeO2 nanocomposites for CO oxidation.
- To investigate the effect of phase distribution and Co3O4 loading on catalytic performance.
Main Methods:
- Sol-gel synthesis routes to create different Co3O4-CeO2 morphologies.
- Temperature programmed reduction (CO-TPR) and flow reactor kinetic tests to assess reactivity.
- X-ray diffraction (XRD) and N2 sorption (BET) for material characterization.
Main Results:
- CeO2-supported Co3O4 layers exhibited the highest activity, reducing the light-off temperature by ~200 °C.
- Intermixed oxides showed lower dispersion, and Co-doped CeO2 had organic residues.
- Optimized Co3O4-CeO2 catalysts (16-65 wt% Co3O4) approached the conversion of Pt/CeO2.
Conclusions:
- The morphology of Co3O4-CeO2 nanocomposites critically impacts CO oxidation efficiency.
- CeO2-supported Co3O4 layers are promising for low-temperature CO oxidation applications.
- Optimized Co3O4-CeO2 catalysts offer a cost-effective alternative to precious metal catalysts.
