Sm(Nd) doped ceria materials for multifunctional application

Zagaynov, Igor V.; Shelepin, I. V.; Fedorov, S. V.; Naumkin, A. V.; Быков, А. А.; Коновалов, А. А.

doi:10.1016/j.ceramint.2021.04.243

Cited by 7 publications

(3 citation statements)

References 62 publications

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“…G. Avgouropoulos et al demonstrated that doping Sm 3+ into CeO 2 increases the dispersion of Au species on the metal oxide support. The doping of Sm improves the catalytic performance of Au/CeO 2 catalyst in the preferential CO oxidation reaction [11]. Moreover, the preparation methods of the catalysts have influence on the properties of CeO 2 -based materials, such as crystallite phase, surface area, particle size, catalytic activity and solubility limit of dopants in CeO 2 [12].…”

Section: Introductionmentioning

confidence: 99%

Catalytic Activity of Ni Based Materials Prepared by Different Methods for Hydrogen Production via the Water Gas Shift Reaction

Tojira

Tepamatr

2023

Catalysts

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Water gas shift reactions (WGS) were evaluated over Ni/CeO2 and Ni/CeSmO catalysts for hydrogen production. The effects of catalyst preparation method and Sm loading were investigated. The Ni/ceria and Ni/CeSmO catalysts were synthesized by combustion, sol gel and sol gel-combustion method. After WGS tests, the catalysts were determined the carbon deposition by thermogravimetric analysis. The thermogravimetric analysis and temperature programmed NH3 desorption showed that addition of Sm promoter made higher the weak acid sites and lower the amount of carbon deposition than the unpromoted catalyst due to it being easily removed. CO chemisorption result indicated that Ni/Ce5%SmO catalyst prepared by combustion method has the highest Ni metal dispersion and metallic surface area compared to the other catalysts. The enhancement of WGS activity of this catalyst is due to more surface active sites being exposed to reactants. Furthermore, H2-temperature programmed reduction analysis confirmed an easiest reduction of this catalyst. This behavior accelerates the redox process at the ceria surface and enhances the oxygen vacancy concentration. The catalytic activity measurements exhibited that the optimum Sm loading was 5% wt. and the best catalyst preparation was the combustion method. The high surface area and small crystallite size of the 5%Ni/Ce5%SmO (combustion) catalyst resulted in sufficient dispersion, which closely related to the WGS activity of the catalyst.

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Section: Introductionmentioning

confidence: 99%

Catalytic Activity of Ni Based Materials Prepared by Different Methods for Hydrogen Production via the Water Gas Shift Reaction

Tojira

Tepamatr

2023

Catalysts

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“…It is known from [5][6][7][8][9][10] that heterometallic complex compounds containing atoms of transition metals and lanthanides are widely utilized due to their unique magnetic, electrical, optical, luminescent and other properties. Introducing different complexing metals and chelating ligands into a molecule of complex compound one can obtain compounds of different composition, i.e.…”

Section: Introductionmentioning

confidence: 99%

“…While, if the current is carried mainly by holes, which are attributed to positive charges, then the Hall voltage changes its sign and0 > H R .Let us investigate the change in the Hall constant with temperature. For that purpose, we combine the equation of the temperature dependence of the charge carrier concentration and formula(6…”

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confidence: 99%

Electrical properties of the nanocomposite (copper, samarium)-containing complex compound

Семенов

Martyniuk

Evseeva

et al. 2022

IOP Conf. Ser.: Mater. Sci. Eng.

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A new semiconductor material tetrakis-μ3-(methoxo)(methanol)-pentakis (acetylacetonate)(tricopper(II), samarium(III)) (I) with composition [Cu3Sm(AA)5(OCH3)4CH3OH], where HAA = H3C–C(O)–CH2–C(O)–CH3 has been synthesized. By the data of elemental analysis and physicochemical research methods, it was established that the obtained complex compound (I) contained atoms of copper (II) and samarium (III) in ratio Cu:Sm = 3:1, and its composition corresponded to the gross formula Cu3SmO15C30H51. Electrical conductivity of the obtained material in pressed form was measured. For the complex compound (I) such parameters were calculated: the number of valence electrons in one molecule − 272; mass of one molecule − 164.867∙10-20 kg; the total number of molecules in the cylindrical sample of a 0.131 g mass and a 18.24∙10-9 m3 volume − 7.946∙1013 moleculas; the total number of valence electrons − 272. In the 303~413 K temperature range, the resistivity of the pressed sample decreases from 4∙1011 to 7∙104Ohm∙cm, which confirms that the isolated compound is a semiconductor with a bandgap ΔE = 1.526 eV. Electrical conductivity properties of the complex compound as thermo- and magnetically sensitive element were studied, for this purpose a test sample of compressed material with 0.5×0.5×1.0 mm geometric dimensions was utilized.

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The Mn/Yb/Er triple-doped CeO2 nanozyme with enhanced oxidase-like activity for highly sensitive ratiometric detection of nitrite

Wei,

Yang,

et al. 2024

Chinese Chemical Letters

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Sm(Nd) doped ceria materials for multifunctional application

Cited by 7 publications

References 62 publications

Catalytic Activity of Ni Based Materials Prepared by Different Methods for Hydrogen Production via the Water Gas Shift Reaction

Catalytic Activity of Ni Based Materials Prepared by Different Methods for Hydrogen Production via the Water Gas Shift Reaction

Electrical properties of the nanocomposite (copper, samarium)-containing complex compound

The Mn/Yb/Er triple-doped CeO2 nanozyme with enhanced oxidase-like activity for highly sensitive ratiometric detection of nitrite

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