Search results for: A. I. Pylinina

Items from 1 to 14 out of 14 results

article

Frame Catalysts of Al₂O₃–ZrO₂–CeO₂ System

L. I. Podzorova, S. G. Chuklina, A. A. Il’icheva, A. A. Konovalov, more

Inorganic Materials: Applied Research > 2018 > 9 > 5 > 960-964

Xerogels and powders of Al₂O₃–ZrO₂–CeO₂ systems with different pore structure and matrixes of ZrO₂ and Al₂O₃ are obtained. The specific surface area of xerogels with ZrO₂ matrix and Al₂O₃ matrix exceeds 200 and 90 m²/g, respectively. After calcinations at 950°C, the powders retain nanoscale, with the size of individual particles ranging from 70 to 28 nm. The main crystalline phase in these powders...

article

Thermal and plasmochemical activation of the zirconia-supported copper catalyst for ethanol dehydrogenation

S. G. Chuklina, A. I. Pylinina, V. V. Khoroshilov

Russian Journal of Physical Chemistry A > 2017 > 91 > 5 > 862-865

It was shown that copper-containing nanocomposites based on t-zirconium dioxide 5% Cu/t-ZrO₂ can be activated using preliminary treatments in high-frequency (HF) hydrogen plasma and critical low-temperature treatments. The increased activity was explained by the formation of many active centers due to the creation of additional t-zirconia defects as a result of the redistribution of copper ions on...

article

Dehydration of Isobutyl Alcohol on Cesium-Cobalt-Containing NASICON Catalysts

A. I. Pylinina, M. N. Chernyshova, N. N. Lobanov, S. V. Savilov, more

Theoretical and Experimental Chemistry > 2017 > 53 > 1 > 47-52

Double and triple cobalt-containing phosphates Cs_1–2xCo_xZr₂(PO₄)₃ (x = 0.15, 0.25, 0.50) with NASICON structure obtained by the sol–gel method were characterized using XRD, BET, XPS, and UV spectroscopy. The major isobutyl alcohol conversion reaction on these phosphates is dehydration. The triple phosphates have higher catalytic activity than the double phosphates in accord with a correlation between...

article

Ethanol dehydrogenation on copper catalysts with ytterbium stabilized tetragonal ZrO₂ support

S. G. Chuklina, A. I. Pylinina, L. I. Podzorova, N. A. Mikhailina, more

Russian Journal of Physical Chemistry A > 2016 > 90 > 12 > 2370-2376

The physicochemical and catalytic properties of Cu-containing crystalline zirconia, obtained via sol–gel synthesis in the presence of Yb³⁺ ions and polyvinylpyrrolidone, are studied. DTG/DSC, TEM, XRD and BET methods are used to analyze the crystallization, texture, phase uniformity, surface and porosity of ZrO₂ nanopowders. It is shown that increasing the copper content (1, 3, and 5 wt % from ZrO...

article

Adsorption of CO₂ on skeletal cobalt and nickel zirconium phosphates after their treatment with high-frequency hydrogen and argon plasma

M. N. Danilova, E. M. Kasatkin, E. B. Markova, A. I. Pylinina, more

Protection of Metals and Physical Chemistry of Surfaces > 2016 > 52 > 5 > 793-796

The effect of the treatment of solid skeletal electrolytes, such as double zirconium phosphates Me_0.5Zr₂(PO₄)₃ (Me = Ni and Co), with high-frequency H₂ and Ar plasma on the adsorption and desorption of CO₂ was examined. It was found that the treatment of cobalt zirconium phosphate with high-frequency H₂ plasma increases its specific surface area, while the pore size is reduced approximately tenfold...

article

The Role of Structure and Conductivity of Perovskites Bi₄V_2−2xM_2xO_11−δ (M = Cu²⁺, Fe³⁺, Zr⁴⁺) in the Catalytic Dehydrogenation of Isobutanol

I. I. Mikhalenko, E. I. Povarova, A. I. Pylinina

Russian Journal of Physical Chemistry A > 2016 > 90 > 4 > 771-776

The catalytic activity of solid electrolytes from the family of complex bismuth vanadates Bi₄V_2−2xM_2xO_11−δ (BIMEVOX) with V5⁺ ions partially substituted by 3d metal cations was studied. In the transformations of isobutanol, it was found to depend on the crystal structure (α, β, γ Aurivillius phases), which changes at increased dopant ion contents (x _M). The highly conductive...

article

Effect of the plasma-chemical treatment of ZnO and NiO on their activity in the dehydrogenation of isopropanol

M. N. Danilova, A. I. Pylinina, E. A. Platonov, V. D. Yagodovskii

Russian Journal of Physical Chemistry A > 2015 > 89 > 8 > 1339-1342

Treating ZnO and NiO oxides with glow discharge oxygen plasma and high-frequency argon plasma is found to affect the catalytic activity of these oxides in the dehydrogenation reaction of isopropanol, leading to an increase in the conversion of alcohol and the yield of acetone. The increased activity of ZnO is due to the high number of acid sites induced by plasma-chemical treatment. With NiO, the...

article

Adsorption of isopropanol and cyclohexane on zinc oxide

I. G. Bratchikova, A. I. Pylinina, E. A. Platonov, M. N. Danilova, more

Russian Journal of Physical Chemistry A > 2015 > 89 > 1 > 108-113

Adsorption isotherms of isopropanol and cyclohexane are obtained in the range of 234–303 K on an initial surface of zinc oxide and after its treatment with glow-discharge plasma in O₂ and high-frequency plasma in Ar. The values of isosteric heat and adsorption entropy are shown to be only slightly affected by these treatments. It is found that the acidity of the surface increases by 38 and 97%, respectively,...

article

Activity of calcined Ag,Cu,Au/TiO₂ catalysts in the dehydrogenation/dehydration of ethanol

Do Tkhyui Mai, A. I. Pylinina, I. I. Mikhailenko

Russian Journal of Physical Chemistry A > 2015 > 89 > 7 > 1184-1188

The catalytic activity of the anatase TiO₂ and M^z+/TiO₂ with supported ions M^z+ = Ag⁺, Cu²⁺, Au³⁺ in vapor phase conversions of ethanol is investigated at temperatures of 100–400°C. It is shown that the yields of acetaldehyde and ethylene decline for the most active catalyst Cu²⁺/TiO₂ but increase for TiO₂ and Ag/TiO₂. The drop in the activation energy of the dehydrogenation reaction over calcined...

article

Reactions of isobutanol over a NASICON-type Ni-containing catalyst activated by plasma treatments

M. N. Danilova, A. I. Pylinina, E. M. Kasatkin, I. G. Bratchikova, more

Kinetics and Catalysis > 2015 > 56 > 4 > 476-479

The effect of hydrogen and argon high-frequency (HF) plasma treatment on the catalytic activity of the nickel zirconium phosphate Ni _0.5 Zr ₂ (PO ₄ ) ₃ in isobutanol dehydration and dehydrogenation has been investigated. The catalyst treated with H ₂ -HF and Ar-HF plasmas shows a ∼2 times higher activity in both reactions. This effect...

article

Adsorption of isopropanol on a nickel oxide

E. A. Platonov, I. G. Bratchikova, A. I. Pylinina, V. D. Yagodovskii

Russian Journal of Physical Chemistry A > 2014 > 88 > 1 > 123-126

Adsorption isotherms of isopropanol are obtained in the temperature range of 243 to 303 K on the initial surface of nickel oxide after its treatment in high-frequency plasma in Ar and glow-discharge plasma in O₂. It is found that such treatment lower the isosteric heat and differential entropy of reversible adsorption, along with the general acidity of the oxide’s surface. At low degrees of filling,...

article

Hydrothermal ethanol conversion on Ag, Cu, Au/TiO₂

Do Tkhyui Mai, I. I. Mikhalenko, A. I. Pylinina

Russian Journal of Physical Chemistry A > 2014 > 88 > 10 > 1637-1642

The effect UV irradiation and silver, copper, and gold ions (M^z+) supported on titania (anatase) have on the activity of M/TiO₂ samples in ethanol conversion at 150–400°C is examined. After UV irradiation, the yields of acetaldehyde and ethylene increase for TiO₂ and Ag/TiO₂ samples, while the activity of Cu²⁺/TiO₂ decreases. The activation energy of ethanol dehydration declines in the order TiO₂...

article

Desorption and reactions between alcohols adsorbed on Na-Zr-M phosphates and a compensator ion M = Cu²⁺, Ni²⁺, Co²⁺

E. I. Povarova, A. I. Pylinina, I. I. Mikhalenko

Protection of Metals and Physical Chemistry of Surfaces > 2014 > 50 > 3 > 331-335

Thermal desorption and reactivity of isopropanol and isobutanol adsorbed on ternary sodiumzirconium orthophosphates M-NZP with ions M²⁺ = Cu, Ni, Co partially substituting sodium ions is studied. The adsorption sites of isopropanol and its dehydration are shown to differ in terms of kinetic order. Desorption and reaction orders are identical for isobutanol. The activation energy of isopropanol desorption...

article

Activation of Cu-, Ag-, Au/ZrO₂ Catalysts for Dehydrogenation of Alcohols by Low-Temperature Oxygen and Hydrogen Plasma

A. I. Pylinina, I. I. Mikhalenko

Theoretical and Experimental Chemistry > 2013 > 49 > 1 > 65-69

We show that the effect of treatment of supported Mⁿ⁺-ZrO₂ catalysts is different in oxygen and hydrogen plasma. The activating effect of an oxygen plasma is connected with a decrease in the activation energy for dehydrogenation and with a change in the oxidation state of modifier ions. We obtain linear correlations of the catalytic characteristics with the reduction potential and radius of M in different...

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Keywords

CATALYTIC ACTIVITY (3)
DEHYDRATION (2)
ETHANOL (2)
ISOBUTANOL (2)
ISOPROPANOL (2)
PLASMA (2)
ACETALDEHYDE (1)
ACIDITY (1)
ACTIVATION ENERGY (1)
ACTIVITY IN ISOPROPANOL DEHYDROGENATION (1)
ADSORPTION (1)
ADSORPTION OF CARBON DIOXIDE (1)
ALCOHOL DEHYDRATION (1)
ALCOHOL DEHYDROGENATION (1)
ALUMINA (1)
BIOETHANOL (1)
BUTANOL (1)
CATALYSIS (1)
CERAMICS (1)
COMPLEX BISMUTH VANADATES (1)
COMPLEX PHOSPHATES (1)
CONDUCTIVITY (1)
COPPER (1)
COPPER-CONTAINING CATALYSTS (1)
CU/ZRO2 (1)
CYCLOHEXANE (1)
DEHYDROGENATION (1)
DEHYDROGENATION OF ETHANOL (1)
ETHANOL DEHYDROGENATION/DEHYDRATION (1)
GOLD (1)
HYDROGEN PLASMA (1)
INDUCED ADSORPTION (1)
IR SPECTROSCOPY (1)
ISOBUTYLENE (1)
LEWIS ACIDIC CENTERS (1)
LEWIS ACIDIC SITES (1)
LOW-TEMPERATURE PLASMA (1)
M Z+/TIO2 CATALYST (1)
NASICON (1)
NICKEL OXIDE (1)
OXIDE CATALYSTS (1)
PHASE STRUCTURE (1)
PLASMA TREATMENT (1)
PLASMA-CHEMICAL TREATMENT (1)
REDUCTIVE ACTIVATION (1)
SILVER (1)
SOLID ELECTROLYTES (1)
STRUCTURE (1)
UV IRRADIATION (1)
ZINC OXIDE (1)
ZIRCONIA (1)
ZIRCONIUM OXIDE (1)
ZIRCONIА (1)
ZNO AND NIO CATALYSTS (1)
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