Effect of Cu/CeO2 catalyst preparation methods on their characteristics for low temperature water−gas shift reaction: A detailed study

• Published in: Catalysis today Vol. 352; pp. 166 - 174
• Main Authors: Ahn, Seon-Yong, Na, Hyun-Suk, Jeon, Kyung-Won, Lee, Yeol-Lim, Kim, Kyoung-Jin, Shim, Jae-Oh, Roh, Hyun-Seog
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.08.2020
• Subjects: Active Cu species; Cu−Ce synergistic effect; Oxygen vacancy concentration; Water−gas shift reaction; Active Cu species; Water−gas shift reaction; Oxygen vacancy concentration; Cu−Ce synergistic effect
• ISSN: 0920-5861; 1873-4308
• DOI: 10.1016/j.cattod.2019.11.017

[Display omitted] •Cu/CeO2 catalysts were prepared using different impregnation orders for Cu and Ce.•Cu–Ce/CeO2 (prepared by co-impregnation) exhibited the highest catalytic activity.•Cu dispersion and Cu particle size are important factors in reaction < 280 °C.•Oxygen vacancy concentration and active Cu species are important factors > 360 °C. To investigate the effect of Cu/CeO2 catalysts preparation methods for low temperature water−gas shift reaction, Cu/CeO2 catalysts were prepared with various impregnation sequences and applied to the water−gas shift reaction at a high gas hourly space velocity of 36,080 mL/g·h. The catalyst preparation method affected both the Cu−Ce synergistic effect and the physico−chemical properties of the Ce promoted Cu/CeO2 catalysts, such as specific surface area, Cu particle size, Cu dispersion, amount of active Cu species and oxygen vacancy concentration. Among the prepared catalysts, Cu–Ce/CeO2 showed the highest CO conversion because of the high contents of active Cu species and high concentration of oxygen vacancies.