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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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Journal ArticleDOI
TL;DR: In this paper, the authors evaluated the effect of the coprecipitation method of a hydrotalcite structure in the synthesis of catalysts of cobalt oxides and found that the catalysts showed greater activity and selectivity to CO 2 and H 2 O than the commercial ones.

43 citations

Journal ArticleDOI
TL;DR: In this article, a series of magnetic Fe0.85Ce0.10W0.05Oz catalysts were synthesized by three different methods (Co-precipitation (Fe0.95Ce 0.10w0.5Oz-CP), Hydrothermal treatment assistant critic acid sol-gel method, and Microwave irradiation expert acid solgel method(Fe 0.85 Ce0 0.05 Oz-MW)), and the catalytic activity was evaluated for selective catalytic reduction of NO with NH3.

43 citations

Patent
26 Sep 1996
TL;DR: The composite positive electrode as discussed by the authors is designed to be incorporated in a rechargeable lithium battery and consists of a metallic current collector sheet the surface of which bears a double layer of a mixed oxide interface containing an oxide of the metal of the current collector and a transition metal oxide.
Abstract: The composite positive electrode comprises a metallic current collector sheet the surface of which bears a double layer of a mixed oxide interface containing an oxide of the metal of the current collector and a transition metal oxide, and a layer of the same transition metal oxide over the mixed oxide interface. The double layer is in contact with a positive electrode containing an oxide of the same transition metal as the cathode active ingredient. The composite positive electrode is designed to be incorporated in a rechargeable lithium battery.

43 citations

Journal ArticleDOI
TL;DR: In this paper, the photocatalytic degradation of phenol under UV-irradiation was evaluated and the role of porosities, crystallinity, and Ti-O-Si linkages of the mixed oxides was demonstrated.
Abstract: TiO2–SiO2 mixed oxide materials were hydrothermally synthesized and the photocatalytic degradation of phenol under UV-irradiation was evaluated. We also demonstrated that varying the co-solvent, modulates the structural properties of the materials. In particular, the use of non-polar co-solvents such as toluene seemed to increase the crystallinity, surface area, and pore diameter while the crystallite size of titania seemed to change little. A comprehensive characterization using surface and bulk techniques evidenced the role of porosities, crystallinity, and Ti–O–Si linkages of the mixed oxides as significant factors that contribute to the degradation of phenol. The TiO2–SiO2 mixed oxide material prepared using only ethanol as the solvent showed 24% degradation of phenol after 120 min of irradiation whereas other mixed oxide materials degraded phenol more efficiently (57% to 100%) in the same duration of time. The higher photocatalytic activities of the mixed oxide materials prepared using non-polar solvents is attributed to a combination of factors that include higher Apparent Surface Coverages of Ti–O–Si heterolinkages, larger pore sizes, and most importantly higher crystallinities of the titania phase. Larger pore sizes enabled better transport of reactant molecules and products to and from the active sites (Ti–O–Si heterolinkages) and the higher crystallinities of the titania phase helped in minimizing the electron–hole recombination in these photocatalysts, and thus resulted in high degradation efficiencies.

43 citations

Journal ArticleDOI
TL;DR: In this paper, the effect of mixed oxide support on the ODH activity and C4 olefins selectivity of n-butane was investigated over ZrO2, SnO2 and mixed oxide supported vanadium oxide catalysts with the aim of utilizing CO2 as the soft oxidant.
Abstract: Oxidative dehydrogenation (ODH) of n-butane was investigated over ZrO2, SnO2 and SnO2–ZrO2 mixed oxide supported vanadium oxide catalysts with the aim of utilizing CO2 as the soft oxidant, and to study the effect of mixed oxide support on the ODH activity and C4 olefins selectivity. The acid–base properties, reducibility, surface area and morphology of the SnO2–ZrO2 mixed oxide and its individual component oxide supported vanadium oxide samples were thoroughly studied. The mixed oxide supported vanadia sample exhibited superior acid–base bifunctionality; in particular, more numbers of medium strength acid–base sites were observed. The reduction temperature of the vanadia was observed to decrease in the case of mixed oxide supported vanadia catalysts. The mixed oxide supported vanadia sample exhibited a high conversion and product selectivity than its individual component oxide supported vanadia samples. A significant difference in the catalyst activity was noted in the presence and absence (He) of CO2 feed gas. Among various catalysts evaluated, the VOx/SnO2–ZrO2 catalyst exhibited excellent performance (22.34 and 36.63% conversion of n-butane and selectivity of C4 olefins, respectively), which is attributed to a high specific surface area, superior acid–base bifunctionality and easily reducibility of the dispersed vanadium oxide.

43 citations


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