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Plyasova, L. M.; Molina, I. Yu.; Kriger, T. A.; Davydova, L. P.; Malakhov, V. V.; Довлитова, Л. С.; Yur'eva, T. M.

doi:10.1023/a:1004869200804

Cited by 7 publications

(6 citation statements)

References 4 publications

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“…Below we give an example of a study of enantiotropic polymorphism in the Ni-Mo oxide system, which is widely used in catalysis, both independently and as part of complex multicomponent catalysts [59]. Similar phenomena were observed for CoMoO 4 [60][61][62], NiO [63][64][65], NiCr 2 O 4 [66][67][68][69], and Fe 2 (MoO 4 ) 3 [70,71]. No.…”

Section: Features Of the Polymorphism Of Several Oxide Catalystsmentioning

confidence: 72%

“…The detailed structure of the hydrogen-containing chromite, as well as the structural features of its reoxidation, are studied in [86,89] by neutron diffraction methods because neutron diffraction is more sensitive to the distribution of light atoms including hydrogen [90]. The results of the refinement of the structure of the activated copper chromite 9.…”

Section: A Study Of the Interaction Of Oxide Catalysts With Hydrogen mentioning

confidence: 99%

“…The spinel hydrogen that is located at the center of the empty octahedra 16c represents the neutral (chargeless) state of hydrogen [87,88]. To maintain the electrical neutrality of the formula unit, the copper ions in the octahedral positions must have the charge of Cu 1+ , as shown in [89][90][91][92]. Considering the Cu 0 atoms that were released to the surface of the chromite, the quantity and forms of the dissolved hydrogen, and the electrical neutrality of the formula unit, the phase composition of the sample that was reduced within 2 h can be written using the formula: …”

Section: A Study Of the Interaction Of Oxide Catalysts With Hydrogen mentioning

confidence: 99%

“…The in situ method was used to study a copper-zinc catalyst for methanol synthesis [94][95][96][97]. Figure 11 presents a diagram for the formation of the active state of the copper-zinc oxide catalyst.…”

Section: Cuo(traces) [Cu ] [Cr ] O (Oh)mentioning

confidence: 99%

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In situ high-temperature X-ray diffraction measurements: Application to the study of heterogeneous catalysts

Plyasova

Kardash

2012

J Struct Chem

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When characterizing the phase composition and structure of catalysts, researchers are faced with the problem of reversible effects of temperature and gas medium during their preparation, activation, or operation. Therefore, particular attention is paid to the methods of their research in appropriate conditions, i.e., in situ high-temperature X-ray diffraction. The theoretical framework and experimental features of high-temperature X-ray diffraction techniques are examined. Examples are given of their effective application to the study of the structural features of oxide catalysts under close-to-real conditions. Keywords: in situ high-temperature X-ray diffraction, thermal X-ray diffraction, oxide catalysts, phase composition, structure in the model conditions of preparation, activation, and operation.

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Section: Features Of the Polymorphism Of Several Oxide Catalystsmentioning

confidence: 72%

Section: A Study Of the Interaction Of Oxide Catalysts With Hydrogen mentioning

confidence: 99%

Section: A Study Of the Interaction Of Oxide Catalysts With Hydrogen mentioning

confidence: 99%

Section: Cuo(traces) [Cu ] [Cr ] O (Oh)mentioning

confidence: 99%

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In situ high-temperature X-ray diffraction measurements: Application to the study of heterogeneous catalysts

Plyasova

Kardash

2012

J Struct Chem

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“…Stoichiograph and the stoichiographic titration are converted DD into a simple, precise, and express tool of the phase analysis, which has been applied to different materials taken as powders, ceramics, small and large crystals, thin films. We are dealing with catalysts [6,[10][11][12][13][14][15][16][17], high-temperature superconductors [18,19], luminophors [20,21], optical materials [22], inorganic pigments [23], natural minerals [3], atmospheric aerosols [24][25], metallurgical slags, archaeological findings, products of mechanicalchemical reactions [26,27], hetero-poly-compounds [12], and others. Analysis was performed for more than 60 elements of the Periodic Table, which have been involved in these materials.…”

Section: The Subjects Of Ddmentioning

confidence: 99%

Stoichiography: New Ways Determining Chemical Composition and Real Structure of Materials

Malakhov

2017

Eurasian Chem. Tech. J.

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The principles of stoichiography and novel reference-free methods of molecular and phase analysis for complex unknown mixtures are considered. The stoichiography can be inferred from stoichiometry of mass transfer of unsteady homo- and heterophase processes and joins both operations: separation of mixture by means of chromatography, electromigration, dissolution or others and determination of stoichiometry of a substance flow with time. The stoichiography allows a chemical compound to be determined by its primary property, namely, by stoichiometry of elemental composition. Stoichiograms provided a basis for such type of information. They are time variances of molar ratio for mass transfer rates of chemical elements from multielement substances. Invariancy to concentration and temperature of solvents, hydrodynamic regime is a fundamental property of the stoichiograms in the case of individual compounds. Therefore the stoichiograms are kept constant and are equal to formula stoichiometric coefficients of the individual compound. Theory and methodology of new stoichographic methods, differential dissolution and ion-chromato-stoichiography are presented. New equipment, stoichiograph, and a new procedure of differential dissolution, stoichiographic titration, are discussed here in details. Applications of differential dissolution to analyze multielement and<br />polyphase crystalline and amorphous samples are given.

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Ethanol dehydrogenation to ethyl acetate by using copper and copper chromite catalysts

Santacesaria

Carotenuto

Tesser

et al. 2012

Chemical Engineering Journal

162

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Cited by 7 publications

References 4 publications

In situ high-temperature X-ray diffraction measurements: Application to the study of heterogeneous catalysts

In situ high-temperature X-ray diffraction measurements: Application to the study of heterogeneous catalysts

Stoichiography: New Ways Determining Chemical Composition and Real Structure of Materials

Ethanol dehydrogenation to ethyl acetate by using copper and copper chromite catalysts

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