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  • 11
    Electronic Resource
    Electronic Resource
    Selective synthesis of C2-C4 hydrocarbons from CO + H2 on composite catalysts (1993)
    Springer
    Catalysis letters 22 (1993), S. 179-187 
    Details
    ISSN: 1572-879X
    Keywords: Cu-Zn-Al catalyst ; hybrid catalyst ; hydrotalcite ; methanol synthesis ; synthesis of C2-C4 hydrocarbons ; zeolites
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A copper-zinc-aluminum methanol synthesis catalyst has been prepared using a precipitated hydrotalcite-type precursor that decomposes to a mixture of the corresponding amorphous oxides at a low temperature. TPR studies show that such a mixture is easy to reduce giving a highly dispersed catalyst. When this is mixed with a zeolite, the resulting hybrid catalyst gives C2-C4 hydrocarbons with very high selectivity. This may be useful in obtaining LPG from synthesis gas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00810364
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  • 12
    Electronic Resource
    Electronic Resource
    On modelling stratospheric positive ions (1988)
    Springer
    Journal of atmospheric chemistry 6 (1988), S. 175-183 
    Details
    ISSN: 1573-0662
    Keywords: Stratosphere ; spherical probe ; recombination coefficient ; ion-composition ; ion density ; exothermic reaction ; Gerdien condenser
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract There has been a considerable improvement in the knowledge of stratospheric positive ion chemistry during the last decade. Results of several in-situ measurements of ion composition have been reported. Total ion density has also been measured with greater accuracy. In this work, theoretical study has been made to reproduce the main features of the above observations. Difficulties encountered in such studies are discussed. Finally models of total ion density and ion composition are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00053853
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  • 13
    Electronic Resource
    Electronic Resource
    In vitro isolation of solid novel flower colour mutants from induced chimeric ray florets of chrysanthemum (2000)
    Springer
    Euphytica 114 (2000), S. 9-12 
    Details
    ISSN: 1573-5060
    Keywords: chimera ; chrysanthemum ; mutation breeding ; regeneration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Rooted cuttings of white flowered cv. `Purnima' and red flowered cv. `Colchi Bahar' of Chrysanthemum morifolium were treated with gamma rays. Sectorial somatic mutations in flower colour were detected in both the cvs. Mutated ray florets (yellow colour for both the cvs) were cultured on agar-solidified Murashige & Skoog basal medium supplemented with sucrose and different combinations of BAP/kinetin and NAA. Direct shoot organogenesis was noticed within 2 weeks of culture initiation. SEM studies confirmed this direct shoot differentiation. The best regeneration was obtained on medium supplemented with 0.2 mg/l NAA and 0.5 mg/lBAP. Shoots regenerated from mutated ray florets were rooted in vitro and transferred to the field. These plants flowered true-to-explant floret colour and shape. These isolated yellow mutants were maintained vegetatively have proved to be true-to-type in two successive generations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003960906646
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  • 14
    Electronic Resource
    Electronic Resource
    Application of in vitro techniques in mutation breeding of chrysanthemum (2000)
    Springer
    Plant cell, tissue and organ culture 60 (2000), S. 33-38 
    Details
    ISSN: 1573-5044
    Keywords: chimera ; Chrysanthemum morifolium ; gamma irradiation ; shoot regeneration ; somatic mutation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Rooted cuttings of Chrysanthemum morifolium cv. Maghi, a small flowered, late blooming cultivar, were treated with different doses of gamma rays. Somatic mutations in flower colour (light mauve, white, light yellow and dark yellow) and chlorophyll variegation in leaves were detected as chimeras in treated populations. Attempts were made to standardize a microtechnique for plant regeneration from mutated tissues of stem node, stem internode, shoot tip and ray floret. All these explants were cultured on Murashige and Skoog's medium with 3% sucrose, 0.8% agar and different concentrations and combinations of growth regulators. Plant regeneration was successful from all of the mutated tissues. Plants with chlorophyll variegation in leaves and two new flower colours (light mauve and white) were isolated in pure form with 64% and 100% efficiency of mutant recovery, respectively. Attempts are being made to use this technique to establish new varieties from chimeric tissues to meet the increasing demand of the floriculture trade.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006442316050
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  • 15
    Electronic Resource
    Electronic Resource
    Secondary grain growth in ammonium nitrate crystallization (1991)
    Springer
    Journal of materials science 26 (1991), S. 3004-3008 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Crystallization and ageing of pure ammonium nitrate crystals was studied by scanning electron microscopy. Ageing the crystals beyond 1 h led to the growth of secondary grains along the grain boundaries of primary grains (140–200 μm). After 6 h ageing secondary growth along grain boundaries was not observed; instead, distinct clusters with morphologies similar to the secondary grains were formed. The ancillary growth obeys approximately the parabolic relation L=(Kt)1/n+1 where n=1 justifies grain growth in the pure crystals, and its formation is ascribed to the dissolution of dendrites, edges and corners. The high interfacial activity and interparticle voids can affect the storage and mechanical properties of the material.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01124835
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  • 16
    Electronic Resource
    Electronic Resource
    Electrical properties of vanadium pentoxide doped with lithium and sodium in the α-phase range (1976)
    Springer
    Journal of materials science 11 (1976), S. 1347-1353 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The electrical conductivity and Seebeck coefficients have been measured from room temperature to 500° C for polycrystalline V2O5 and V2O5 doped with lithium and sodium in the α-phase range. The conductivity increases with doping and the energy of activation decreases. The Seebeck coefficient indicates that electrons are the majority carriers. The results have been discussed in terms of the two-level hopping model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00545157
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  • 17
    Electronic Resource
    Electronic Resource
    Preparation of a Ru/Al2O3 catalyst from Ru3(CO)12 infrared and XPS study (1984)
    Springer
    Reaction kinetics and catalysis letters 26 (1984), S. 143-147 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Рутениевые каталиэаторы на носителе Al2O3, приготовленные иэ Ru3(CO)12, были исследованы с помощью ИК и рентгеновской фотоэлектронной спектпоскопии (XPS). Триатомный кластер эадерживается на носителе, но при 150°C отщепляется. Для полного удаления карбонильных групп требуется наг⌕ев при 350°C в вакууме. XPS исследования укаэывают на то, что раэложившийся каталиэатор при дальнейшем восстановлении в H2 при 400°C уже не иэменяется. Атомы рутения остаются эахваченными в порах носителя.
    Notes: Abstract A supported ruthenium catalyst on alumina prepared from Ru3(CO)12 has been studied by infrared and X-ray photoelectron spectroscopy (XPS). The triatomic cluster is retained on the support but breaks down at 150°C. Complete elimination of the carbonyl groups requires heating at 350°C under vacuum. XPS studies show that the decomposed catalyst does not change on further reduction in H2 at 400°C. The ruthenium atoms remain trapped within the pores of the support.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02063881
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  • 18
    Electronic Resource
    Electronic Resource
    Carbon monoxide oxidation on cobaltites of the lanthanides: Effect of A-site substitution (1987)
    Springer
    Reaction kinetics and catalysis letters 33 (1987), S. 131-136 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Каталитическое окисление CO исследовано на Nd1−xBaxCoO3 и LnCoO3 (Ln=La, Sm, Nd, Dy). Каталитическую активность сравнивали с изменением х, кхслородных дефектов и со структурнями изменениями. Найдено, что соединехия с кубической структурой дают максимальную активность, которая уменьшается в направлении от кубической структуры. Это объясняют лучшей делокализацией d-электронов кобальта кубических соединений.
    Notes: Abstract Catalytic oxidation of CO has been studied on Nd1−xBaxCoO3 and LnCoO3 (Ln=La, Sm, Nd, Dy). Catalytic activity was compared with changing x, oxygen defects and structural changes. It has been found that compounds with cubic structure show maximum activity, which decreases with deviation from cubic structure. This has been explained as due to better delocalization of the d-electrons of cobalt in the cubic compounds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02066712
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  • 19
    Electronic Resource
    Electronic Resource
    XPS study of CO oxidation on lanthanum cobaltite (1986)
    Springer
    Reaction kinetics and catalysis letters 31 (1986), S. 413-416 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract РФЭС спектры LaCoO3 были сняты перед и после обработки in situ окисью углерода при комнатной температуре и 200°C. Доказано, что газовая CO реагирует с хемосорбированным кислородом, давая CO2.
    Notes: Abstract XPS spectra of LaCoO3 have been studied before and after in situ treatment with carbon monoxide at room temperature and at 470 K. It has been concluded that gaseous CO reacts with chemisorbed oxygen to form CO2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02072980
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  • 20
    Electronic Resource
    Electronic Resource
    Catalytic properties of vanadium bronzes, I. Decomposition of isopropanol (1977)
    Springer
    Reaction kinetics and catalysis letters 6 (1977), S. 307-314 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Разложение изопропанола на V2O5 и бронзах: Li0,02V2O5, Na0,02V2O5, Na0,06V2O5, Li0,33V2O5 и Na0,33V2O5 было исследовано в области температур 186–300°C. Для первых четырех катализаторов основной реакцией оказалась дегидратация до пропена с незначительной дегидрогенизацией до ацетона. Дегидратация на этих катализаторах увеличивается с содержанием щелочного металла, а энергия активации остается неизменной. На последних двух катализаторах дегидратация и дегидрогенизация протекают при сравнимых скоростях. Исходя из влияния продуктов на начальную скорость, данных электропроводимости катализаторов и их ЭПР спектров, предлагается механизм дегидратации изопропанола.
    Notes: Abstract Decomposition of isopropanol on V2O5 and the bonzes Li0.02V2O5, Na0.02V2O5, Na0.06V2O5, Li0.33V2O5, and Na0.33V2O5 has been studied in the temperature range 168–300°C. The main reaction was found to be dehydration to propene with negligible dehydrogenation to acetone on the first four catalysts. Dehydration on these catalysts increased with the alkali metal content, but the energy of activation remained unchanged. On the last two catalysts, dehydration and dehydrogenation proceeded at comparable rates. A tentative mechanism for the dehydration of isopropanol is proposed, based on the effect of the product on the initial rate, the electric conductivity of the catalysts and their ESR spectra.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02070225
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