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  • 1
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Исследована ацсорбция н-бутиламина при 405 К на цеолитах NaHY с помощью микрокалориметрии. Кривые зависимости теплоты адсорбции от заполненип характерно измехяются с температурой активации цеолита. На основе этих изменений можно определить, какая часть кривых отвечает адсорбции н-бутиламина на центрах Брёнстэда и какая на центрах Льюоиса.
    Notes: Abstract The adsorption, of n-butylamine has been studied at 405 K on NaHY zeolites by microcalorimetry. The curves of the variation in the heat of adsorption as a function of the coverage change characteristically with the temperature of activation of the zeolite. From the course of these changes it is possible to establish which part of the curve corresponds to the adsorption of n-butylamine on Brönsted or Lewis acid centers.
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  • 2
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Обмен C3D6 с гидроксилированным и частично дегидроксилированным HY цеолитом был исследован в газовой (МС) и твердой (ИК) фазах при 300°C и при температуре инфракрасного луча.
    Notes: Abstract The exchange of C3D6 with hydroxylated and partially dehydroxylated HY zeolites was studied by the analysis of the gas (MS) and the solid (IR) phase at 300°C and at the temperature of the IR beam.
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  • 3
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Было исследовано взаимодействие пропилена с CoNaX и NaX цеолитами и обмеи водородов пропилена CoNaX цеолитом при температурах инфракрасного луча и 300°C с помощью ИК и МС анализа. Также были измерены теплоты адсорбции. Было овнаружено, что присутствие Co2+ ионов оказывает влияние на структуру адсорбированного комплекса пропилена. Сопоставлены кислотные свойства OH групп цеолитов НУ, НХ и CoNaX и обсужден механизм овмена.
    Notes: Abstract Interaction of propene with CoNaX and NaX zeolites and exchange of propene hydrogens with CoNaX zeolite was studied at the temperature of the IR beam and at 300°C by means of IR and MS analysis. In addition, the heats of adsorption were measured. The structure of adsorbed propene complexes was found to be influenced by the presence of Co2+ ions. The mechanism of the exchange is discussed and the properties of the OH groups of HY, HX and CoNaX zeolites are compared.
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  • 4
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Изотопный обмен D2 с OH группами HY цеолитов был исследован в твердой и газовой фазах с помощю ИК и масс-снектроскопии Скорость обменов O2−OH и O2−H2 порышается с дегидроксилированием образцов. Активные центры возникают, вероятно, за счет отрыва решеточного кислорода, и катализируют диссоциацию O2. Дегидроксилирование сопровоздается возникновением групп OH, поглощающих при 3740 см−1, обмен которюх медленнее, чем для остальных OH и оказывает влияние на кинетику обмена в газовой фазе.
    Notes: Abstract The exchange reaction of D2 with OH groups of HY zeolites was followed both in the solid and gas phase by IR and MS. The rates of D2−OH and D2−H2 exchange increase considerably with dehydroxylation of the sample. The active centers are probably vacancies formed by removal of oxygen from the lattice, they catalyze the dissociation of D2. Dehydroxylation of the sample is accompanied by the formation of 3 740 cm−1 hydroxyls, whose exchange with D2 is slower than that with other OH groups and which affect the kinetics in the gas phase.
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  • 5
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Обработка цеолита Fe(III)NaY раствором соли NaCl не приводит к обратному обмену ионов железа. Однако, катионы Fe перегруппировываются в новые комплексы, которые способны восстанавливаться водородом до более глубокой степени, а термическая вакуумная обработка приводит к более слабому автовосстановлению, чем для Fe в исходном цеолите FeNaY.
    Notes: Abstract The treatment of Fe(III)NaY zeolite with NaCl solution does not lead to a back-exchange of ferric species but the cationic Fe rearranges into new complexes which are more deeply reduced by hydrogen and less self-reduced by vacuum heat treatment than the parent Fe species in FeNaY zeolite.
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  • 6
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Било исследовано взаимодействие C3H6 и обмен C3D6 при температуре инфракракрасного луча и при 300 °C с HX цеолитами дегидроксилированными в разной степени. Обмен был исследован при помощи анализа твердой (ИК) и газовой (МС) фаз. Были сопоставлены свойства HX и HY цеолитов.
    Notes: Abstract The interaction of C3H6 and the exchange of C3D6 with a HX zeolite dehydroxylated to various degrees was studied at the temperature of the IR beam and at 300 °C. The exchange was followed by the analysis of the gas phase (MS) and the solid phase (IR). The properties of HX and HY zeolites were compared.
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  • 7
    ISSN: 1572-879X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Temperature programmed description of small amounts of preadsorbed and converted methanol (TPD-C) was studied on acidic forms of modified Y zeolites. The modification consisted of generation of various types and amounts of non-skeletal Al species which yield Al Lewis acid sites, and, consequently, of changes of the number and strength of the Brönsted acid sites. All the non-skeletal Al species enhanced the methanol conversion to products whose composition was dependent on their properties as well as on the remaining skeletal hydroxyls.
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  • 8
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The construction of an infrared cell for spectrometric measurements of surface complexes on solids at temperatures up to 450 °C is described. A Pt resistance element measures the temperature of the sample caused by radiation from the source of infrared spectrometer.
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  • 9
    ISSN: 1572-879X
    Keywords: anionic Pt-carbonyl complexes ; CO chemisorption on Pt ; IR spectroscopy ; UV/VIS diffuse reflectance spectroscopy ; faujasites
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The temporal generation of anionic platinum-carbonyl complexes in platinum ionexchanged zeolites X and Y by reductive carbonylation at 105 Pa and 363 K is monitored by in situ UV/VIS and FTIR spectroscopy. A monomer [Pt3(CO)6]2−, exhibiting bands at 318 and 456 nm in the UV/VIS spectra and at 1790 and 2025 cm−1 in the FTIR spectra, is the only platinum/species formed in NaX. The monomer as well as oligomers are generated in NaY, where the formation of the latter species is due to the stronger acidity in the NaY as compared to NaX. The decomposition of the complexes results in the generation of Pt clusters of the size ≤1 nm.
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  • 10
    ISSN: 1572-879X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Adsorption of various octenes and octanes was studied with a 10-membered ring molecular sieve, H-[B]ZSM-5. Adsorption of octane was very fast, the double-branched octane diffused slowly, and the triple-branched molecules could not enter the channels of the sample. Since the 10-membered ring molecular sieves are the best catalysts for skeletal isomerisation of n-butene, trimethylpentenes or other larger oligomers cannot be intermediates in this reaction. By contrast, skeletal isomerisation of n-butane which is known to require 12-membered ring channels, can involve a trimethylpentane-like molecule as an intermediate.
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