Influence of Hydrogen Peroxide in the Preparation of Nanocrystalline Ceria

Abstract

The influence of H2O2 in the preparation of nanocrystalline CeO2 has been investigated by treating solutions of Ce(III) with NaOH in the presence of different concentrations of H2O2. The resulting precipitated material was then examined by a range of techniques, including transmission electron microscopy (TEM), X-ray diffraction (XRD), thermogravimetric analysis (TGA), Raman spectroscopy and X-ray photoelectron spectroscopy (XPS). A decrease in CeO2 crystallite size with increasing H2O2 concentration was observed. This was found to be associated with the formation of an amorphous material containing an η2-peroxide (O2 2-) species.

Water–Gas Shift Reaction over CuO/CeO2 Catalysts: Effect of the Thermal Stability and Oxygen Vacancies of CeO2 Supports Previously Prepared by Different Methods

“…Wang et al [23] also reported that the metallic copper interacted with surface oxygen vacancies on ceria plays a decisive role in the WGS reaction. However, the properties of ceria materials strongly depend on the preparation methods, such as sol-gel (SG) [24], hydrothermal routes [25,26], precipitation method [27,28], reverse micelle [29], sonochemical [30], chemical vapor deposition (CVD) [31], flux method [32] and micro-wave heating [33], as well as surfactant-assisted [34]. Then, if the ceria was prepared via different methods and used as support, what is the effect of the different support properties on the interaction between CuO and ceria and, as a consequence, the catalytic performance of CuO/CeO 2 catalysts for the WGS reaction?…”

Mesoporous CePrO solid solution with efficient photocatalytic activity under weak daylight irradiation

“…Indeed, it is well known that oxygen vacancies, positively charged, can capture the photogenerated electrons, efficiently separating them from the holes. On the other hand, oxygen vacancies maybe improve the adsorption capacity of H 2 O 2 on the surface of Ce Pr O due to the coordination interactions between oxygen vacancies and H 2 O 2 (due to the electronegativity of the oxygen lone pair) and thus produce some intermediate products such as O 2− 2 and/or {Ce(O 2 ) + } [28,29], which are then changed into active species to oxidize RhB. In order to estimate It is well known that, being the photocatalytic reaction carried out on the surface of the catalyst, the properties of its surface play an important role.…”

The influence of precipitation temperature on the properties of ceria–zirconia solid solution composites

“…As reported in a previous study [10], numerous methods have been used to prepare OSM, including sol-gel, hydrothermal routes, homogeneous precipitation, spray hydrolysis, sonochemical, solid-state mechanochemical methods, and microwave heating. Among them, the precipitation method is the simplest experimental approach for a large scale production, thus it has received considerable attention.…”