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Catalysis

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Updated: Jan 13, 2026

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Titania-Based Oxide Catalysts for Removing Nitrogen Oxides.

Anna Białas¹, Natalia Kowalska¹, Małgorzata Zimowska²

¹AGH University of Krakow, Faculty of Energy and Fuels, Mickiewicza 30, 30-059 Krakow, Poland.

Materials (Basel, Switzerland)

|January 10, 2026

Summary

Cerium and iron-doped titania catalysts effectively reduce nitrogen oxide at high temperatures without producing N₂O. These mesoporous materials exhibit excellent catalytic activity due to surface Fe³⁺ or Ce³⁺ ions.

Keywords:

SCR NO cerium iron sol–gel titania

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Area of Science:

Catalysis
Materials Science
Environmental Chemistry

Background:

Selective catalytic reduction (SCR) of nitrogen oxides (NOx) is crucial for environmental protection.
Developing efficient and stable catalysts for NOx reduction is an ongoing research challenge.

Purpose of the Study:

To synthesize and evaluate titania catalysts doped with cerium, copper, or iron for selective nitrogen oxide reduction.
To investigate the structural and catalytic properties of these novel catalysts.

Main Methods:

Sol-gel method for catalyst synthesis.
X-ray diffraction (XRD) for structural analysis.
Nitrogen sorption for surface area determination.
Catalytic activity testing for selective nitrogen oxide reduction.

Main Results:

Titania catalysts doped with cerium and iron demonstrated high activity for nitrogen oxide reduction between 200-400 °C.
No nitrous oxide (N₂O) byproduct was detected.
Materials exhibited anatase structure with nanometric crystallites and mesoporosity (74-160 m²/g).
Optimal Ce/Ti and Fe/Ti atomic ratios ranged from 0.1 to 0.9.

Conclusions:

Cerium and iron-doped titania catalysts are effective for selective nitrogen oxide reduction.
Catalytic activity is attributed to the presence of Fe³⁺ or Ce³⁺ ions on the catalyst surface.
The optimized catalysts offer a promising solution for NOx emission control.