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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, a Mars van Krevelen-based mechanism was proposed for the partial and full oxidation of methane over yttria/zirconia mixed oxide with first order kinetics for methane and oxygen.

39 citations

Journal ArticleDOI
TL;DR: In this article, a new heterometallic complex [NiCu(NO3)2(H2O)2] was prepared via the reaction of aqueous solutions of (oxalic acid, nickel nitrate and copper nitrate), and mixed oxide CuO-NiO was successfully obtained with different morphological structures through the annealing of 1 at different temperature 300°C and 600°C, respectively.
Abstract: New heterometallic complex [NiCu(NO3)2(H2O)2] (1) was prepared via the reaction of aqueous solutions of (oxalic acid, nickel nitrate and copper nitrate). Mixed oxide CuO-NiO was successfully obtained with different morphological structures (2) and (3) through the annealing of 1 at different temperature 300 °C and 600 °C, respectively. The materials were characterized using FT-IR, TGA, XRD and SEM. As showed from XRD data, with increasing the calcination temperature the crystallinity of CuO-NiO in sample 3 was improved and the diffraction peaks exhibited narrower and stronger than CuO-NiO in sample 2. The average size of CuO-NiO crystals obtained was calculated from Debye-Scherrer equation and found to be 16.65 nm. To assemble the working electrode of 2-aminophenol (2-AP) chemical sensor, a thin layer of CuO-NiO NPs was deposited on glassy carbon electrode (GCE) with conducting binder and used to detect 2-AP in aqueous medium successfully. The chemical sensor is exhibited the higher stability, good sensitivity (20.2729 μAmM−1 cm−2) and enhanced electrochemical activity at room conditions. Therefore, the fabricated chemical sensor with active CuO-NiO NPs may be an effective and sensitive sensor for detection of hazardous materials by reliable I–V method for broad scales environmental safety of and healthcare sectors.

39 citations

Journal ArticleDOI
TL;DR: A series of Mg3−xZnxFe0.5Al 0.5 mixed oxide catalysts derived from hydrotalcites were tested in the ethylbenzene dehydrogenation to styrene in He atmosphere at 550 ˚C as mentioned in this paper.
Abstract: A series of Mg3−xZnxFe0.5Al0.5 mixed oxide catalysts derived from hydrotalcites were tested in the ethylbenzene dehydrogenation to styrene in He atmosphere at 550 °C. The catalysts were prepared by coprecipitation from the nitrates of metal components followed by calcination to mixed oxides at 550 °C. A part of Mg2+ in Mg3Fe0.5Al0.5 mixed oxide was replaced with Zn2+ to test the effect of MgO as the support. The mixed oxides were composed of periclase and spinel-type compounds with a high surface area of 100 – 180 m 2 g cat − 1 . Mossbauer and XPS measurements indicated the presence of Fe3+ on the catalysts and H2-TPR measurement suggested that the dehydrogenation reaction is catalyzed by the reduction–oxidation between Fe3+/Fe2+. The activity of Mg3−xZnxFe0.5Al0.5 mixed oxide decreased with increasing x, indicating an important role of MgO on the activity. Both CO2-TPD measurements as well as IR measurements of adsorbed CO2 clearly indicated the presence of basic sites of Mg2+O2− on the catalysts. It seems that the combination of Mg2+O2− and Fe3+ was essential for the catalytic activity. It is concluded that the surface base sites generated on O2− bound Mg2+ near Fe3+ sites are responsible for H+-abstraction; the dehydrogenation of ethylbenzene was initiated by the H+ abstraction on Mg2+O2− basic sites, and accelerated by the reduction–oxidation of Fe3+/Fe2+ active species.

39 citations

Journal ArticleDOI
TL;DR: In this article, the authors proposed a simulation of X-ray diffraction patterns using DIFFaX code, as well as HRTEM, IR-, UV-spectroscopies, and XPS.

39 citations

Journal ArticleDOI
TL;DR: Magnesium/lanthanum mixed oxide is an effective heterogeneous catalyst for aldol-type condensation of aldehydes and imines with ethyl diazoacetate (EDA) at room temperature in water as mentioned in this paper.
Abstract: Magnesium/lanthanum mixed oxide is an effective heterogeneous catalyst for aldol-type condensation of aldehydes and imines with ethyl diazoacetate (EDA) at room temperature in water to afford corresponding β-hydroxy-α-diazo carbonyl compounds and β-amino-α-diazo carbonyl compounds in good yields. The catalyst is recovered and reused for several cycles with consistent activity.

39 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202318
202265
2021184
2020198
2019175
2018178