Reduction properties of Ce in CeO_x/Pt/Al₂O₃ catalysts

Abstract

Note: Novel CeOx/Pt/Al2O3 catalysts have been prepared and characterised under different environments using XANES spectroscopy. The XANES spectra show that conversion to Ce3+ in an atmosphere of H2 is achieved, indicating that Ce is readily reduced at room temperature when well dispersed in the presence of Pt.

Spontaneous Formation of Asymmetric Oxygen Vacancies in Transition-Metal-Doped CeO2 Nanorods with Improved Activity for Carbonyl Sulfide Hydrolysis

“…Peak D corresponds to the final states of O 2p–Ce 5d hybridizations . This is mainly because the cubic crystal-field splitting of the Ce 5d state leads to the delocalization of the d character at the bottom of the conduction band . The concentration of Ce 3+ can be calculated by its area.…”

Understanding the role of promoters in catalysis: operando XAFS/DRIFTS study of CeOx/Pt/Al2O3 during CO oxidation

“…The physicochemical properties of the CeO x /Pt/Al 2 O 3 catalyst have been reported elsewhere [4]. In brief, the catalyst was found to have Ce and Pt content of 2.3 and 3.8 wt%, respectively by ICP-OES analysis.…”

“…Preparation of the CeO x /Pt/Al 2 O 3 catalyst has been reported elsewhere alongside its physicochemical characteristics [4]. In brief, 4 wt% Pt/ γ-Al 2 O 3 supplied by Johnson Matthey was modified with CeO x in a manner similar to that employed previously [5,12].…”

“…One of the challenges of studying this relationship is the low number of atoms present at the interface between the nanoparticle and the metal oxide relative to that in the bulk of the particles. Wells et al recently published work on the preparation of CeO x /Pt/Al 2 O 3 catalysts and their application for low temperature water gas shift (LTS) [4]. Here, a controlled amount of CeO x was targeted at the Pt nanoparticles to maximise the relative interfacial area.…”

In Situ Investigations on the Facile Synthesis and Catalytic Performance of CeO2-Pt/Al2O3 Catalyst

“…Some methods for cerium addition into Al 2 O 3 supported catalyst have been reported, for instance, incipient wetness impregnation [10], controlled surface reaction (CSR) technique [18], and atomic layer deposition (ALD) technique [19]. The latter two methods can effectively improve the dispersity of ceria, but the use of expensive organometallics, such as Ce(acac) 3 (cerium acetylacetonate) and Ce(TMHD) 4 (tetrakis(2,2,6,6-tetramethyl-3,5-heptanedionato)cerium) is required to prepare the CeO 2-x /Pt/Al 2 O 3 catalyst.…”