Topic
Mixed oxide
About: Mixed oxide is a research topic. Over the lifetime, 5224 publications have been published within this topic receiving 115567 citations.
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TL;DR: The present method will be useful for fast and routine determination of uranium in mixed oxide samples of Th and U, without the need for dissolution, which is difficult and time consuming due to the refractory nature of ThO(2).
50 citations
TL;DR: In this article, a review of non-hydrolytic sol-gel routes based on alkyl halide elimination is presented, as well as examples of applications to the synthesis of oxides and mixed oxides that may be of interest as catalysts or supports.
Abstract: The first part of this article is a concise review on non-hydrolytic sol-gel routes based on alkyl halide elimination. The molecular chemistry founding these routes is presented, as well as examples of applications to the synthesis of oxides and mixed oxides that may be of interest as catalysts or supports. In the second part, the straightforward non-hydrolytic preparation of a SiO2 –TiO2catalyst (not involving supercritical drying) is reported. The resulting SiO2–TiO2 calcined xerogel was highly homogeneous and displayed a high BET surface area located mainly in the mesopore region. Preliminary tests in the epoxidation of cyclohexene by cumene by hydroperoxide indicated good selectivity and activity.
50 citations
TL;DR: In this article, phase-pure MoV(TeNb) M1 oxide catalysts were studied to gain insight into the multiple catalytic functions of the surface of the M1 structure.
Abstract: Propane oxidation at 653–673 K and benzyl alcohol oxidation at 393 K over phase-pure MoV(TeNb) M1 oxide catalysts were studied to gain insight into the multiple catalytic functions of the surface of the M1 structure. Electron microscopy and X-ray diffraction confirmed the phase purity of the M1 catalysts. Propane oxidation yields acrylic acid via propene as intermediate, while benzyl alcohol oxidation gives benzaldehyde, benzoic acid, benzyl benzoate, and toluene. The consumption rates of benzyl alcohol and propane level in the same range despite huge difference in reaction temperature, suggesting high activity of M1 for alcohol oxidation. Metal–oxygen sites on the M1 surface are responsible for the conversion of the two reactants. However, different types of active sites and reaction mechanisms may be involved. Omitting Te and Nb from the M1 framework eliminates acrylic acid selectivity in propane oxidation, while the product distribution in benzyl alcohol oxidation remains unchanged. The results suggest...
50 citations
TL;DR: The application of perovskite oxides in catalysis is reviewed in this article, where selective and total oxidation, nitrogen oxides decomposition and reduction as well as other miscellaneous uses of mixed oxide catalysts are discussed.
Abstract: The application of perovskite oxides in catalysis is reviewed. Selective and total oxidation, nitrogen oxides decomposition and reduction as well as other miscellaneous uses of mixed oxide catalysts are discussed. A final section describes the most promising areas of research to increase the number of commercial uses of perovskite oxides.
50 citations
TL;DR: In this article, two nickel-manganese hydroxycarbonates with Ni/Mn ratios close to 2/1 (Ni2Mn) and 3/1(Ni3Mn), were synthesized by coprecipitation under an air atmosphere from aqueous solutions of Ni(II) and Mn(II).
50 citations