A systematic study of the synthesis and characterization of pristine ceria and of mixed cerium/metal oxides has been undertaken. Various synthetic routes were explored, with the crystallization process being examined via thermal analysis, XRD and electron microscopy. It was shown that even when multiple phases were generated upon heat treatment, mixed phases were also generated. However, the presence of organic molecules during the syntheses, as matrices, solvents or precipitating bases, had a profound effect upon the surface texture of the samples prepared.
A co-precipitation method has been used to prepare ternary mixed oxides based on ceria with the general formula V x Cu x Ce 1 -2x O 2 , where x was varied between 0.05 and 0.45. The structural and surface properties as well as the morphologies of the solids were examined by thermogravimetric analysis, differential scanning calorimetry, X-ray diffraction studies, nitrogen adsorption isotherms, Fourier-transform infrared spectroscopy and scanning electron microscopy.For samples where the vanadium and copper content was low (x ≤ 0.3), the surface area increased and the pore distribution shifted towards the micropore range. The sample V 0.05 Cu 0.05 Ce 0.9 O 2 exhibited the highest surface area and the sample V 0.45 Cu 0.45 Ce 0.1 O 2 the smallest. The samples were calcined within the temperature range 473-1073 K. When the vanadium content was increased to x ≥ 0.3 and the calcination temperature set at 673 K, a phase with composition CeVO 4 was detected via X-ray diffractometry, in addition to a V 2 O 5 and a CeO 2 phase. The FT-IR spectra confirmed the above results.
Analytical chemists have long used statistical methods to help them organize and interpret experimental data -especially where large numbers of these are generated -as well as to help them design new experiments. Recently, chemometrics has found applications in wider fields, such as the determination of the geographical origin of food and other products. During the past several years, we have carried out a systematic study of the factors affecting the pore structure and surface chemistry of cerium oxide and of mixed oxides of cerium with various transition metal or alkaline earth metal ions.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.