Thermal stability and catalytic properties of the composite amorphous Al2O3-nanocrystals ZrO2

Al’myasheva, O. V.; Vlasov, E. A.; Khabenskii, V. B.; Гусаров, В. В.

doi:10.1134/s1070427209020104

Cited by 11 publications

(7 citation statements)

References 2 publications

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“…The obtained result is one of important reasons explaining extremely high catalytic activity of the system ZrO 2 -Al 2 O 3 in the reaction of hydrogen oxidation. This phenomenon was observed in [13]. The analogous effect was described in [14] where the influence of nanoscale layers of V and V 2 O 5 on the surface of InP and GaAs on the process of thermal oxidation of these semiconductors was demonstrated.…”

Section: Introductionsupporting

confidence: 63%

A Model of Irregular Impurity at the Surface of Nanoparticle and Catalytic Activity

Blinova¹,

Гусаров²,

Popov³

2012

Commun. Theor. Phys.

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A problem of nanocatalyst improvement is considered. The existence of irregularities at the surface of nanoparticle leads to the increasing of the surface/volume ratio and, correspondingly, to the improvement of the catalytic activity. But this impurity gives one an additional effect due to the change of the electronic density at the surface. We suggest simple model for the description of this effect. The model allows one to find the discrete spectrum of the Schrödinger operator for nanoparticle. Due to this impurity induced bound states the electron density increases near the surface. It leads to the increase of the catalytic activity of nanoparticles with surface impurities.

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Section: Introductionsupporting

confidence: 63%

A Model of Irregular Impurity at the Surface of Nanoparticle and Catalytic Activity

Blinova¹,

Гусаров²,

Popov³

2012

Commun. Theor. Phys.

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“…The structure and contribution of nonautonomous phases and properties of polycrystalline materials are greatly influenced by the size and misalignment degree of crystallites in their composition [131][132][133][134][135]. The thickness, structure, composition, and properties of the intercrystalline layer (nonautonomous phase) vary by the crystallite misalignment degree [1,13,27,30,40,59,71,73,85]. The ratio between crystallite size and intercrystalline layer thickness (nonautonomous surface phase), in turn, determines the volume fractions of crystallites and intercrystalline formations in the polycrystalline material [75, 78-82, 105, 106].…”

Section: Status Of Nonautonomous Phases and Materials With The High Vmentioning

confidence: 99%

“…Research in the field of synthesis of new compounds with a high content of nonautonomous phases is aimed at both producing original functional materials with variable performance properties and developing related technologies for their production. In this regard, the synthesis of nanoceramics and other materials of constructional and functional purpose [3,4,7,8,24,76,192,[234][235][236][237][238][239][240][241][242][243][244][245][246], in particular, materials intended for use in thermoelectric energy converters [240,241], ferrites [13, 25, 52, 59, 64, 97-99, 107, 145], high-temperature superconductors [175,238,244], catalysts [13,22,36,37,39,40,46,60], radioactive waste immobilization matrices [236,237,239], is of great interest among the developments noted in Section 2.…”

Section: Fig 1 Dependence Of Nonautonomous Phase Volume Fraction Inmentioning

confidence: 99%

“…non-autonomous phases, and the volume phases in the materials [30][31][32][33][34][35]. Such phenomena related to the formation of nonautonomous phases as material surface nanofragmentation invoking the nanocrystalline structure fractality, improved adsorption and catalytic properties, are also of great interest [36][37][38][39][40][41][42][43][44][45][46][47][48].…”

Section: Introductionmentioning

confidence: 99%

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Thermodynamics and kinetics of non-autonomous phase formation in nanostructured materials with variable functional properties

Коваленко¹,

Тугова²

2018

Nanosystems: Phys. Chem. Math.

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The review addresses physico-chemical aspects of interaction between macro-, micro-and nano-structured units of matter with the analysis of interface and grain boundary entities (nonautonomous phases) mechanisms and formation, as well as methods of their control in order to achieve the desired functional properties of nanostructured materials. Construction of these materials involves identification of thermodynamic and kinetic regularities in the organization processes, state and genesis parameters of nonautonomous phases formed as specific nanosized structures in a limited space between the macroscopic volume phases and with the limited amount of substance, which differ significantly on their properties, structure and composition from the appropriate characteristics of volume phases. Studying them is based on the application and development of theoretical and experimental methods of non-equilibrium thermodynamics, chemical kinetics, nonlinear dynamics and fractal analysis to determine the conditions of self-organization or materials directed synthesis with a high content of nonautonomous phases.

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“…In addition, they have no vacancy swelling, which is essential for the technology of fast neutron reactors and thermonuclear reactors [1,2]. The primary carrier based on the Fe-Cr-Al alloy can be used in block catalysts for high-temperature hydrocarbon conversion, in particular, methane conversion, as well as hydrogen oxidation [3,4].…”

Section: Introductionmentioning

confidence: 99%

Research of the Thermal Effect on the Fe-Cr-Al Alloy Foil in the Initial State and with the Supported Secondary Carrier

Khussain¹,

Brodskiy²,

Sass³

et al. 2022

Preprint

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Iron and chromium based alloys have found wide application in various fields of science and technology. Primary carrier based on Fe-Cr-Al alloy is used in block catalysts for high-temperature hydrocarbon conversion, in production of block metal catalysts for neutralization of toxic gases released during operation of internal combustion engines, as well as those present in smoke emissions from enterprises. Influence of thermal action on Fe-Cr-Al alloy foil and stability of secondary carrier on its surface was studied. Elemental composition of the surface layer of X15U5 alloy foil does not remain constant during heating and depends on the thermal treatment mode. Some of the elements come to surface and elemental composition of surface layer can differ significantly from that observed in the bulk of foil sample. This implies the possibility of changing the adhesive and adsorption properties of the foil surface, as well as the need to take this fact into account when supporting a secondary carrier and active phase to the foil. Applied technique of phosphating and supporting a secondary carrier to the foil surface makes it possible to obtain a sufficiently stable coating. There is no shedding of the secondary carrier from foil surface during high-temperature treatment in air.

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Thermal stability and catalytic properties of the composite amorphous Al2O3-nanocrystals ZrO2

Cited by 11 publications

References 2 publications

A Model of Irregular Impurity at the Surface of Nanoparticle and Catalytic Activity

A Model of Irregular Impurity at the Surface of Nanoparticle and Catalytic Activity

Thermodynamics and kinetics of non-autonomous phase formation in nanostructured materials with variable functional properties

Research of the Thermal Effect on the Fe-Cr-Al Alloy Foil in the Initial State and with the Supported Secondary Carrier

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