Precursor-Concentration-Regulated CuO-CeO2 Catalysts with Tailored Oxygen Species and Redox Behavior for Efficient C3H6 Catalytic Combustion
- 1Key Laboratory of Energy Thermal Conversion and Control, Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China
Abstract
Flame synthesis is a promising route for producing mixed-oxide catalysts, but the role of precursor concentration in regulating catalyst formation during self-sustained flame pyrolysis remains insufficiently understood. In this work, CuO-CeO2 mixed-oxide catalysts were prepared by varying the total metallic precursor concentration from 0.04 to 0.28 mol·L−1 while keeping the Cu/(Cu + Ce) molar ratio fixed at 35 mol.%. This strategy enables the influence of precursor concentration to be distinguished from that of metal composition and provides insight into the formation of CuO-CeO2 catalysts under a self-sustained flame environment. The results show that precursor concentration strongly affects particle aggregation, crystallite growth, Cu species distribution and possible lattice incorporation, oxygen species distribution, and low-temperature reducibility. Among the prepared catalysts, CuCe0.20 exhibits the most favorable balance among textural characteristics, Cu-Ce interaction, oxygen species distribution and redox behavior, and surface reactive oxygen availability. As a result, CuCe0.20 achieves 90% C3H6 conversion at 380 °C and nearly complete conversion at 450 °C. More importantly, it maintains stable activity during a 600 min test at 450 °C with an apparent CO2 selectivity of 99.9%. Post-reaction characterization further reveals that the CeO2 framework and Cu-Ce interaction are largely retained, while the relative contribution of lattice oxygen increases after long-term reaction, accompanied by retained low-temperature reducibility. This work extends the design of flame-made CuO-CeO2 catalysts from composition optimization to precursor-concentration engineering and demonstrates a practical strategy for preparing stable non-noble metal catalysts for VOC catalytic combustion.
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BibTeX
@article{zhang2026precursorconcentrationregulated,
title = {{Precursor-Concentration-Regulated CuO-CeO2 Catalysts with Tailored Oxygen Species and Redox Behavior for Efficient C3H6 Catalytic Combustion}},
author = {Shuo Zhang and Tianze Zhang and Yuxiao Lu and Shiya Meng and Zhenkun Sun and Yuanqiang Duan},
journal = {Molecules},
year = {2026},
month = oct,
doi = {10.3390/molecules31203653},
url = {https://www.mdpi.com/1420-3049/31/20/3653},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Precursor-Concentration-Regulated CuO-CeO2 Catalysts with Tailored Oxygen Species and Redox Behavior for Efficient C3H6 Catalytic Combustion
AU - Shuo Zhang
AU - Tianze Zhang
AU - Yuxiao Lu
AU - Shiya Meng
AU - Zhenkun Sun
AU - Yuanqiang Duan
PY - 2026
DA - 2026/10/13
JO - Molecules
DO - 10.3390/molecules31203653
UR - https://www.mdpi.com/1420-3049/31/20/3653
AB - Flame synthesis is a promising route for producing mixed-oxide catalysts, but the role of precursor concentration in regulating catalyst formation during self-sustained flame pyrolysis remains insufficiently understood. In this work, CuO-CeO2 mixed-oxide catalysts were prepared by varying the total metallic precursor concentration from 0.04 to 0.28 mol·L−1 while keeping the Cu/(Cu + Ce) molar ratio fixed at 35 mol.%. This strategy enables the influence of precursor concentration to be distinguished from that of metal composition and provides insight into the formation of CuO-CeO2 catalysts under a self-sustained flame environment. The results show that precursor concentration strongly affects particle aggregation, crystallite growth, Cu species distribution and possible lattice incorporation, oxygen species distribution, and low-temperature reducibility. Among the prepared catalysts, CuCe0.20 exhibits the most favorable balance among textural characteristics, Cu-Ce interaction, oxygen species distribution and redox behavior, and surface reactive oxygen availability. As a result, CuCe0.20 achieves 90% C3H6 conversion at 380 °C and nearly complete conversion at 450 °C. More importantly, it maintains stable activity during a 600 min test at 450 °C with an apparent CO2 selectivity of 99.9%. Post-reaction characterization further reveals that the CeO2 framework and Cu-Ce interaction are largely retained, while the relative contribution of lattice oxygen increases after long-term reaction, accompanied by retained low-temperature reducibility. This work extends the design of flame-made CuO-CeO2 catalysts from composition optimization to precursor-concentration engineering and demonstrates a practical strategy for preparing stable non-noble metal catalysts for VOC catalytic combustion.
SN - 1420-3049
ER -