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: Magnesium−alumina mixed oxide catalysts at Mg:Al atomic ratios of 3:1, 2:1.8, and 1:2.8 were synthesized by using the sol−gel technique as discussed by the authors.
Abstract: Magnesium−alumina mixed oxide catalysts at Mg:Al atomic ratios of 3:1, 2:1.8, and 1:2.8 were synthesized by using the sol−gel technique. Dehydroxylation and phase transformations were studied with ...
46 citations
TL;DR: In this paper, a series of NiO/γ-alumina catalysts prepared by impregnation have been investigated by X-ray diffraction, diffuse reflectance spectroscopy and temperature-programmed reduction.
Abstract: A series of NiO/γ-alumina and NiO/La2O3–γ-alumina catalysts prepared by impregnation have been investigated by X-ray diffraction, diffuse reflectance spectroscopy and temperature-programmed reduction. For the NiO/γ-alumina catalysts with low nickel oxide content, a strong interaction between NiO and γ-alumina leads to the diffusion of Ni2+ ions into vacant surface sites of the support to form surface spinel NiAl2O4 and thus the reducibility of NiO was decreased. At high nickel oxide contents, NiO crystal appears after the surface vacancies have been filled. In this case, the counter-diffusion of Ni2+ and Al3+ ions at the interface was observed during calcination.For NiO/La2O3–γ-alumina catalysts with low La2O3 content, Ni2+ ions tend to interact with γ-alumina. The addition of the La2O3 has little effect on the state of the NiO species interacting directly with γ-alumina. For the catalysts with high La2O3 content, the dispersion of NiO was enhanced by the existence of La2O3, which can be ascribed to the formation of an La–Ni mixed oxide (or microcrystallites of NiO separated by La2O3). Strong interactions between components, such as NiO and Al2O3, and La2O3 and Al2O3, are influenced dramatically by the calcination temperature. As the temperature rises, the increasing interaction leads to the formation of bulk LaAlO3 and NiAl2O4. However, the calcination temperature has little effect on the interaction between NiO and La2O3.
46 citations
TL;DR: In this paper, a series of supported iron oxide based catalysts, Fe2O3 (15wt%)/MO2 (M = Zr, Ce, Ti and Si), synthesized by adsorption-equilibrium method, is investigated for sulfuric acid decomposition reaction.
46 citations
TL;DR: In this article, it was shown that the specific activity for the formation of butadiene from 1-butene may be directly related to the concentration of antimony cations at the surface.
46 citations
TL;DR: In this paper, the authors found that the decomposition of NO is facilitated by the redox cycle of Cu, and that Y-Ba-Cu-O mixed oxide catalysts supported on MgO were found to have higher catalytic activity for NO decomposition than a commercial Pt supported catalyst at 800 °C.
Abstract: Y–Ba–Cu–O mixed oxide catalysts supported on MgO were found to have higher catalytic activity for NO decomposition than a commercial Pt supported catalyst at 800 °C. XPS analysis suggests that the decomposition of NO is facilitated by the redox cycle of Cu.
46 citations