调控Cu/CeO<sub>2</sub>催化剂形貌增强低温CO氧化的耐水性

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Abstract Herein, tube-, rod- and particle-like Cu/CeO₂ catalysts were synthesized and their structure-performance relationship for CO oxidation in moist conditions was explored. The results revealed that the tube-like catalysts (CuCe-NT) exhibited excellent low-temperature activity and superior H₂O resistance stability. The characterization results indicated that CuCe-NT catalyst had a lower crystallinity, larger surface area and more structural defects in comparation with rod-like (CuCe-NR) and particle-like (CuCe-NP) samples, which greatly strengthened the interactions between CuO_x and CeO₂, thus boosting the redox of Ce⁴⁺/Ce³⁺ and Cu²⁺/Cu⁺, and the surface enrichment of Ce³⁺ and Cu⁺, further facilitating the CO adsorption and oxidation. Moreover, the hollow structure of CuCe-NT catalyst with a large pore size effectively inhibited the associatively adsorption of H₂O, suppressing the generation of inert OH groups on oxygen vacancies, and thus maintaining its higher oxidization in the presence of water. In situ-DRIFTS showed that compared to CuCe-NP catalyst, the nanotube structure of CuCe-NT catalyst alleviated the competitive adsorption of H₂O with CO, and inhibited the formation of bridged carbonates, thus ensuring the CO oxidation under humid atmosphere. This study revealed the effect of catalyst structure on its resistance of H₂O in terms of H₂O adsorption type and reaction mechanism, thus providing an ingenious strategy for the design of H₂O-resistant CO oxidation catalysts.

Key words： water resistance CO oxidation Cu/CeO₂ catalysts tailorable morphology structural defects

Received: 29 February 2024

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X511

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	XUE Jing
	LI Qiao-yan
	LI Shu-ning
	LIANG Mei-sheng

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XUE Jing,LI Qiao-yan,LI Shu-ning等. Regulating the morphology of Cu/CeO₂ catalysts to enhance their water-resistant for low temperature CO oxidation[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(10): 5415-5425.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I10/5415

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