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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: In this article, the Co−Mn−Al mixed oxide catalysts were obtained by thermal decomposition of hydrotalcite-like precursors with Co/(Mn + Al) molar ratio of 2 and Mn/Al molar ratios varying from 0 to 2.
71 citations
TL;DR: Several palladium-tin oxide (PdO-SnO 2 ) catalysts were prepared by the impregnation and co-precipitation methods as discussed by the authors, and the reduction and adsorption properties of PdO/snO 2 were quite different from those of PdrO/Al 2 O 3 and Pd o/ZrO 2.
Abstract: Several palladium-tin oxide (PdO-SnO 2 ) catalysts were prepared by the impregnation (PdO/SnO 2 ) and co-precipitation (PdO-SnO 2 ) methods. Among the catalysts tested, the SnO 2 -supported 11 wt.% PdO catalyst prepared by the impregnation method showed the highest conversion at low temperatures. The reduction and adsorption properties of PdO/SnO 2 were quite different from those of PdO/Al 2 O 3 and PdO/ZrO 2 . X-ray diffraction (XRD) of these catalysts revealed that 10 nm PdO particles were supported on SnO 2 for the impregnated catalysts, while the co-precipitated catalysts were composed of uniform PdO-SnO 2 mixed oxide particles. Even at room temperature, the PdO particles in PdO/SnO 2 were easily reduced to metallic Pd and absorbed H 2 with the H 2 /Pd weight ratio of 0.3%. In both PdO/SnO 2 and PdO-SnO 2 samples, adsorption of CO was significantly suppressed because of the interaction between Pd and SnO 2 ; the metal surface area was difficult to estimate by the CO pulse technique.
71 citations
TL;DR: In this paper, a new crystalline phase, with a Te/V/Mo atomic ratio of 1/0.2-1.7, has been isolated and characterised by XRD and IR spectroscopy.
Abstract: TeMxMo1.7O mixed oxides (M = V and/or Nb; x = 0-1.7) have been prepared by calcination of the corresponding salts at 600 °C in an atmosphere of N2. A new crystalline phase, with a Te/V/Mo atomic ratio of 1/0.2-1.5/1.7, has been isolated and characterised by XRD and IR spectroscopy. This phase is observed in the TeVMo or TeVNbMo mixed oxide but not in the TeNbMo mixed oxide. The new crystalline phase shows an XRD pattern similar to Sb4Mo10O31 and probably corresponds to the M1 phase recently proposed by Aouine et al. (Chem. Commun. 1180, 2001) to be present in the active and selective MoVTeNbO catalysts. Although these catalysts present a very low activity in the propane oxidation, they are active and selective in the oxidation of propene to acrolein and/or acrylic acid. However, the product distribution depends on the catalyst composition. Acrolein or acrylic acid can be selectively obtained from propene on Nb-free or Nb-containing TeVMo catalysts, respectively. The presence of both V and Nb, in addition to Mo and Te, appears to be important in the formation of acrylic acid from propene.
71 citations
TL;DR: In this article, a mesoporous-assembled TiO2-ZrO2 mixed oxide nanocrystal photocatalyst with a molar ratio of 93:7 calcined at 500°C exhibited the highest photocatalytic hydrogen production activity.
71 citations
TL;DR: In this article, the effects of incorporating Ce into ZrO2 on the catalytic activity and selectivity of Cu/Cex Zr1−x O2 for the hydrogenation of CO to methanol were investigated.
71 citations