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Tuning low-temperature N₂O decomposition over Ni-Y-modified cobalt Spinels.

Jia-Yin Lin¹, Yi-Fan Yao², Tsai-Hsuan Hsieh²

¹Graduate Program in Semiconductor and Green Technology, Academy of Circular Economy, National Chung Hsing University, Nantou 540, Taiwan; Graduate Program in Industrial and Smart Technology, Academy of Circular Economy, National Chung Hsing University, Nantou 540, Taiwan; Innovation and Development Center of Sustainable Agriculture, National Chung Hsing University, Taichung 402, Taiwan.

Journal of Colloid and Interface Science

|February 25, 2026

Summary

A novel NiY co-modified cobalt spinel catalyst efficiently decomposes nitrous oxide (N₂O) at low temperatures. This breakthrough offers a promising solution for industrial N₂O abatement, reducing greenhouse gas emissions.

Keywords:

Isotope tracing Low-temperature catalysis Nitrous oxide Ni–Y co-modified co₃O₄ Surface oxygen exchange

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Area of Science:

Catalysis
Environmental Chemistry
Materials Science

Background:

Nitrous oxide (N₂O) is a potent greenhouse gas and ozone-depleting substance.
Efficient low-temperature catalysts are crucial for industrial N₂O abatement.

Purpose of the Study:

To synthesize and evaluate a ternary NiY co-modified cobalt spinel catalyst (NCY) for N₂O decomposition.
To understand the role of Ni and Y in enhancing catalytic performance.

Main Methods:

Controlled co-precipitation synthesis of the NCY catalyst.
Characterization using various analytical techniques.
In situ FTIR, mass spectrometry, and 18O isotope tracing for mechanistic studies.

Main Results:

The NCY catalyst achieved over 90% N₂O conversion at 400 °C with low activation energy (52.77 kJ mol⁻¹).
Ni incorporation modified cobalt oxide surface environments, while Y stabilized the lattice.
Dynamic surface oxygen exchange was observed, indicating a surface-mediated decomposition pathway.

Conclusions:

The cooperative effect of Ni and Y enhances low-temperature catalytic efficiency for N₂O abatement.
This provides a practical strategy for improving cobalt spinel catalysts in N₂O decomposition.