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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.


Papers
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Journal ArticleDOI
TL;DR: In this paper, the texture and acid properties (i.e., the nature, density, and strength of acid sites) of Zn-Cr oxides, as well as the Pd dispersion in the catalysts, are thoroughly characterised.

54 citations

Journal ArticleDOI
01 Jan 1990-Vacuum
TL;DR: The surface composition of RuO2+IrO2 mixed oxide layers (1-2 μm thick) deposited on titanium by thermal degradation of the corresponding chlorides in aqueous or isopropanol solutions has been investigated as discussed by the authors.

54 citations

Journal ArticleDOI
TL;DR: Porous Mn−Cu and Mn− Cu−V mixed-oxide sorbents prepared by the complexation technique were tested for high-temperature removal of H2S in the presence of hydrogen gas as discussed by the authors.
Abstract: Porous Mn−Cu and Mn−Cu−V mixed-oxide sorbents prepared by the complexation technique were tested for high-temperature removal of H2S in the presence of hydrogen gas. Sorption experiments carried out at 627 °C in a fixed-bed reactor showed higher reactivity and also higher sulfur retention capacity (over 0.15 g of S/g of sorbent) for the Mn−Cu mixed oxide than for the Mn−Cu−V mixed oxide. Successive sulfidation−regeneration cycles demonstrated that the Mn−Cu mixed oxide was also more stable than Mn−Cu−V, maintaining its activity and about 90% of its sulfur retention capacity at the end of five cycles. Although formation of some MnSO4 was observed during regeneration at 700 °C with a gas mixture containing 6% oxygen in nitrogen, this did not cause significant reduction in the activity of this mixed-oxide sorbent. It was also shown that a previously proposed deactivation model gave good predictions of the experimental breakthrough curves obtained with these sorbents.

53 citations

Journal ArticleDOI
TL;DR: In this article, a series of Ni-Al-O mixed oxides with different aluminum content were synthesized via a facile co-evaporation route and tested in ethane oxidative dehydrogenation.
Abstract: A series of Ni–Al–O mixed oxides with different aluminum content ranging from 1% to 50% (metal atomic content) were synthesized via a facile co-evaporation route and tested in ethane oxidative dehydrogenation. In samples with Al loading up to 30%, the crystal structure of NiO is retained and the interaction between nickel oxide and alumina leads to smaller crystal sizes, higher surface areas and decreased reducibility, along with a gradual decrease in the amount of desorbed oxygen observed by O 2 -TPD measurements. At higher aluminum loadings the formation of an amorphous spinel-like precursor phase is evidenced. Correlation between the catalytic performance of Ni–Al–O mixed oxide and their oxygen desorption properties showed that as the excess oxygen per catalyst surface area decreases, the catalysts become less active in the activation of ethane, but more selective toward ethylene. The catalyst containing 30% aluminum represents the optimum composition among Ni–Al–O mixed oxides studied in this work. Further optimization of the catalyst preparation method with the use of an organic aluminum precursor led to the development of a catalyst presenting up to 85% selectivity toward ethylene. The enhanced performance of this material was correlated with the further reduction of catalyst over-stoichiometry and oxygen lability induced by the organic precursor, according to O 2 -TPD and isotopic oxygen exchange experiments respectively.

53 citations

Patent
28 Nov 2002
TL;DR: In this article, the authors proposed a catalyst for reducing the amount of NO x in the lean exhaust gas from lean burn engines, comprising active aluminum oxide, magnesium oxide, and at least one noble metal of the platinum group of the periodic table of the elements.
Abstract: The invention relates to a catalyst for lowering the amount of NO x in the lean exhaust gas from lean burn engines, comprising active aluminum oxide, magnesium oxide and at least one noble metal of the platinum group of the periodic table of the elements, as well as at least one nitrogen oxide storage material. The catalyst is characterized in that the magnesium oxide forms a homogeneous mixed oxide with aluminum oxide and is present in a concentration of about 1 to about 40 wt- %, based on the total weight of the mixed oxide.

53 citations


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