Comparison of the effects of the catalyst preparation method and CeO2 morphology on the catalytic activity of Pt/CeO2 catalysts for the water-gas shift reaction. Issue 18 (17th August 2020)

• Record Type: Journal Article
• Authors: Lee, Yeol-Lim; Mnoyan, Anush; Na, Hyun-Suk; Ahn, Seon-Yong; Kim, Kyoung-Jin; Shim, Jae-Oh; Lee, Kyubock; Roh, Hyun-Seog
• Is Part Of: Catalysis science & technology. Volume 10:Issue 18(2020)
• Page Start: 6299
• Page End: 6308
• Publication Date: 2020-08-17
• Subjects: Catalysis -- Periodicals; 541.395
• DOI: 10.1039/d0cy01067g
• Languages: English
• ISSNs: 2044-4753

Abstract

Abstract : The key factors (Pt 0 dispersion & oxygen vacancies) should maintain high values to attain high catalytic activity and they are directly affected by the morphology and the preparation method of the catalyst. Abstract : In this study, the effects of the catalyst preparation method and CeO2 particle morphology of Pt/CeO2 catalysts for the water-gas shift reaction are compared. CeO2 supports having nanorod and nanocube morphologies were prepared. Over both types of supports, 1 wt% Pt was loaded via either the incipient wetness impregnation (IWI) method or the strong electrostatic adsorption (SEA) method. In total, four types of Pt/CeO2 catalysts were prepared, and these were characterized using various techniques and tested for the water-gas shift reaction. The cube-shaped-CeO2 -based catalysts showed higher catalytic activities than the rod-shaped-CeO2 -based catalysts due to the higher dispersion of Pt 0 regardless of the catalyst preparation method. From the viewpoint of the catalyst preparation method, the IWI-prepared catalysts showed higher catalytic activity than the SEA-prepared catalysts regardless of the morphology of CeO2 because of the larger amount of oxygen vacancies induced by the strong interaction between PtO x and CeO2 . These results highlight the fact that the catalyst preparation method and the morphology of the CeO2 support strongly affect the key factors (Pt 0 dispersion and number of oxygen vacancies) separately, which are directly related to the catalytic activity in the water-gas shift reaction. It also confirms that both key factors should achieve high values to attain high catalytic activity.