4,325 Result(s)
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Article
On the rate of CO + O recombination
On the basis of the results reported in Ref. [9], the rate constant for the reaction O+CO+O2→CO2+O2 can be expressed as k=6.5×10−36 (3700/RT) cm3 mol−1s−1 in the temperature range of 400–500 K. It is suggested th...
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Article
Some properties of nickel catalysts obtained in the reaction of bis (π-allyl) nickel with silica
The preparation of high dispersity nickel catalysts by reacting bis (π-allyl) nickel with silica gel is described. The reduced catalysts contain nickel which is fully accessible for oxygen adsorption at 20°C a...
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Article
Theoretical study of the interaction of propylene and oxygen with the surface of transition metal oxides
Quantum chemical methods were applied to study the interaction of propylene and oxygen with divalent and trivalent cations of Fe2O3, Co3O4 and NiO surfaces. Propylene is more strongly adsorbed on trivalent ions a...
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Article
Chemical composition of solid LixNi1−xO solutions
A study of oxygen isotope exchange and Auger spectra has shown the presence of lithium oxide (dissociating when heated in vacuum) on the surface of solid LixNi1−xO solutions.
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Article
On the oxidation of ammonia over Bi2O3. MoO3 systems
Oxidation of NH3 over Bi2O3. MoO3 catalyst indicates the importance of electronic factors in oxide systems doped with small amounts of another oxide, and of structural factors for the intermediate compositions. C...
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Article
X-ray absorption K-spectra of high dispersity nickel
The X-ray absorption K-spectra of high-dispersity supported Ni were studied as a function of the particle size. The particle size distribution was determined from the dependence of magnetic susceptibility on t...
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Article
Kinetic isotope effect in the chlorination of methane
The ratio of the rate constants has been measured for the reaction of atomic chlorine with CH4 and CD4 within the temperature range 163–613 K. At low temperatures (163–300 K) the ratio is 2.2 exp (1180/RT). The p...
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Article
Nature of active centers of molybdenum catalysts for propylene disproportionation, obtained in the reaction of tetrakis(π-allyl)molybdenum with silica
The activities of surface compounds of Mo(VI), Mo(IV) and Mo(II) obtained via interaction of Mo(π-C3H5)4 with silica have been compared using the disproportionation of propylene. The surface compounds of tetraval...
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Article
Interaction of indane with a Ni−Al2O3 catalyst studied by temperature programmed desorption
By the method of temperature programmed desorption, it has been established that the adsorption of indane on a Ni−Al2O3 catalyst occurs on two types of active sites: (I) Al2O3 and (II) nickel. The active sites of...
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Article
Study of the chlorination of CH4 and CD4 in a CO2 laser beam
The chlorination of CH4 and CD4 has been studied under CO2 laser radiation. Measurements of the kinetic isotope effect indicate the separation of chain initiation and chain propagation regions under these conditi...
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Article
Mechanism of the dehydrogenation of formic acid by iridium and rhodium complexes
The homogeneous catalytic process HCOOH→H2+CO2 has been studied in the presence of carbonyl-free phosphine complexes of iridium (I) and (III), and rhodium (I). The rupture of the C−H bond has been found to be the...
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Article
Cracking of kerosene-gasoline cuts on decationized calcium zeolites without binding agents
The activity and selectivity of decationized Ca zeolites, containing no binding agent, have been studied in the cracking of kerosene-gasoline cuts. The activity of the samples increases with increasing degree ...
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Article
Interaction of cumylperoxy radicals with aliphatic monocarboxylic acid esters
The oxidation rates of different monocarboxylic acid esters have been determined in the presence of cumyl hydroperoxide at 50–115°C, in chlorobenzene solution. The rate constants of hydrogen atom abstraction b...
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Article
Properties of silica-supported Pt−Mo and Pd−Mo catalysts obtained from organometallic compounds
An assumption has been made on the possibility of stabilizing highly dispersed metal particles in the presence of low-valent transition metal ions bound to the carrier. This assumption is supported by studies ...
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Article
On the nature of UV absorption upon olefin adsorption on γ-Al2O3
The interaction between γ-Al2O3 and ethylene, propylene, α-butene, carbon monoxide and dioxide, formic acid, acetone and methane has been studied by diffuse reflectance spectroscopy and adsorption measurements. A...
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Article
Diffractometric study of the structure of Raney nickel containing added zirconium, tantalum and manganese
The structure and phase composition of Raney nickel containing added zirconium, tantalum and manganese were determined by X-ray analysis, electron diffraction and electron microprobe analysis.
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Article
On the role of σ- and π-allyl complexes in the oxidation of propylene to acrolein
The conversions of the σ- and π-allyl complexes of propylene formed (1) upon the adsorption of propylene and allyl bromide on an oxide catalyst surface, and (2) upon interacting bis(π-allyl)nickel and tetrakis...
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Article
Product selectivity and qualitative reaction scheme for the dehydrogenation and hydrogenolysis of n-butane over supported ruthenium at high temperature
The dehydrogenation and hydrogenolysis of n-butane (n-C4) over a Ru−Al2O3 catalyst (0.849 w/w% Ru) have been studied at 490°C at different time factors. Some runs have also been made on pure γ-Al2O3 at 490°C and ...
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Article
Mechanism of electron transfer in dinitrogen fixation in the system Ti(III)−Mo(III)
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Article
Reactivity of vibrationally excited methane molecules in reactions with chlorine atoms
At 148–298 K, the rate constant for the reaction of methane molecules excited into bending vibration with atomic chlorine does not exceed by more than 30 times the corresponding constant for methane in thermal...
