de Freitas Silva T, Assaf JM, Lucrédio AF, Reis CGM, Almeida KA. Influence of La
2O
3 Addition on CuO/CeO
2 Catalysts for the Water-Gas Shift Reaction.
LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2025;
41:3108-3120. [PMID:
39883849 PMCID:
PMC11823619 DOI:
10.1021/acs.langmuir.4c03606]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2024] [Revised: 01/19/2025] [Accepted: 01/20/2025] [Indexed: 02/01/2025]
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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