Influence of La₂O₃ Addition on CuO/CeO₂ Catalysts for the Water-Gas Shift Reaction.

IF 3.9 2区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Langmuir Pub Date : 2025-02-11 Epub Date: 2025-01-30 DOI:10.1021/acs.langmuir.4c03606

Tatiana de Freitas Silva, José Mansur Assaf, Alessandra Fonseca Lucrédio, Cristhiane Guimarães Maciel Reis, Karina Arruda Almeida

引用次数: 0

Abstract

CuO/CeO₂ and CuO/xCeO₂-yLa₂O₃ catalysts, synthesized with varying CeO₂ and La₂O₃ molar ratios (1:1, 1:2, and 2:1), were prepared via the hydrothermal method and tested in the water-gas shift reaction (150-350 °C). La₂O₃ addition altered structural properties, reducing surface area and copper dispersion. XANES and in situ XRD confirmed metallic Cu species during reduction and reaction. Catalytic tests revealed CuO/CeO₂ excelled at low temperatures, while La₂O₃-doped catalysts, especially CuO/1CeO₂-1 La₂O₃, performed better at 250-350 °C. Stability tests showed La₂O₃-doped catalysts resisted deactivation and sintering better than CuO/CeO₂, even with CO₂ and H₂ in the feed.

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La2O3加入对CuO/CeO2水气转换反应催化剂的影响

采用水热法制备了不同CeO2和La2O3摩尔比（1:1、1:2和2:1）的CuO/CeO2和CuO/xCeO2-yLa2O3催化剂，并在150 ~ 350℃的水气转换反应中进行了测试。La2O3的加入改变了结构性能，降低了比表面积和铜的分散性。XANES和原位XRD证实了还原和反应过程中金属Cu的存在。催化实验表明，CuO/CeO2在低温下表现优异，而La2O3掺杂的催化剂，特别是CuO/1CeO2-1 La2O3在250 ~ 350℃时表现较好。稳定性测试表明，即使在原料中有CO2和H2的情况下，la2o3掺杂的催化剂也比CuO/CeO2具有更好的抗钝化和烧结性能。

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来源期刊

Langmuir 化学-材料科学：综合

CiteScore

6.50

自引率

10.30%

发文量

1464

审稿时长

2.1 months

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Influence of La2O3 Addition on CuO/CeO2 Catalysts for the Water-Gas Shift Reaction.

Abstract

Influence of La₂O₃ Addition on CuO/CeO₂ Catalysts for the Water-Gas Shift Reaction.