Varuna Jayachandran (2025) The synergistic performance of redox couples enhanced with phase inter-grown ceria-zirconia-alumina mixed oxides: A robust three-way catalyst for diesel exhaust abatement. The synergistic performance of redox couples enhanced with phase inter-grown ceria-zirconia-alumina mixed oxides: A robust three-way catalyst for diesel exhaust abatement, 41. pp. 1-14. ISSN 2352-1864

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Abstract

The CeO2-ZrO2 and Al2O3 (75 wt% and 25 wt%) were prepared by co-precipitation route,
calcined at 500 ◦C for 5 h and mechanically mixed. Three compositions of Ce/Zr (20:80, 50:50,
and 80:20) were synthesized and their microstructural properties was observed via X-ray
diffraction (XRD), and Raman analysis. The CeO2-ZrO2/Al2O3 (Ce/Zr-50:50) sample reveals the
mixed phase formation of cubic and tetragonal, which facilitates the catalytic activity via oxygen
ion diffusion from O2- sub-lattice to the sample surface. The CeO2-ZrO2/Al2O3 (Ce/Zr-50:50) was
further investigated using High-resolution transmission electron microscope (HRTEM), Brunauer�Emmett-Teller (BET) study, X-ray photoelectron spectroscopy (XPS), and Scanning electron mi�croscope (SEM). The surface area of CeO2-ZrO2/Al2O3 (Ce/Zr − 50:50) was 91.2 m2 g− 1
, which
provides surface active oxygen species to participate in diesel exhaust treatment via redox re�actions. The XPS spectra of CeO2-ZrO2/Al2O3 (Ce/Zr − 50:50) sample confirms the Ce3+ reduction
along with the formation of oxygen vacancies. To perform catalytic reaction, the CeO2-ZrO2/
Al2O3 (Ce/Zr − 50:50) sample was coated on the perforated stainless-steel substrates by a unique
and cost-effective technique, which could be economically advantageous to produce the catalyst
for commercial uses on a large scale. The sample was tested at different load conditions. At
maximum load condition, the sample exhibited substantial reduction in CO, HC, CO2, NOx, and
smoke.

Item Type: Article
Uncontrolled Keywords: CeO2-ZrO2/Al2O3 Rare earths XPS AVL Digas analyzer Diesel exhaust treatment
Divisions: PSG College of Arts and Science > Department of Physics
Depositing User: Dr. B Sivakumar
Date Deposited: 01 Apr 2026 06:17
Last Modified: 01 Apr 2026 06:17
URI: https://ir.psgcas.ac.in/id/eprint/2763

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