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  • Springer  (14)
  • Wiley  (3)
  • Nature Publishing Group
  • 1990-1994  (17)
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  • 1
    Electronic Resource
    Electronic Resource
    Excess molar volumes and viscosities of the ternary systemn-butylamine + 1,4-dioxane + acetonitrile at 25°C (1990)
    Springer
    Journal of solution chemistry 19 (1990), S. 1085-1094 
    Details
    ISSN: 1572-8927
    Keywords: Densities ; viscosities ; n-butylamine + 1,4-dioxane + acetonitrile system ; excess molar properties ; ternary system
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Densities and viscosities for the n-butylamine + 1,4-dioxane + acetonitrile system were determined at 25°C and molar excess volumes and excess viscosities were calculated. Of the different expressions existing in the literature that predict these excess properties for ternary mixtures from data for the binary mixtures, the empirical correlation of Singh et al. is the best for this system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00649453
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  • 2
    Electronic Resource
    Electronic Resource
    Olefins polymerization on titania and titania-supported rhodium (1991)
    Springer
    Catalysis letters 8 (1991), S. 37-43 
    Details
    ISSN: 1572-879X
    Keywords: Olefins polymerization ; Rh/TiO2 catalysts ; titania ; rhodium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The adsorption of ethene and propene on titania and titania-supported rhodium has been studied, observing a continuous adsorption even after 24 h. The samples have been reduced at 623 or 773 K, but no difference was observed, whichever the reduction temperature or the presence of rhodium, on the amount of gas adsorbed per unit of surface area of the solid. A study of the polymerization has been done following the “equal reactivity hypothesis”, and it has been concluded that the role played by the rhodium particles is to facilitate adsorption of the gaseous molecule, that is then transfered to the surface of the support, where it polymerizes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00764381
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  • 3
    Electronic Resource
    Electronic Resource
    Purification and properties ofl-serine dehydratase fromLactobacillus fermentum ATCC 14931 (1991)
    Springer
    Current microbiology 22 (1991), S. 205-211 
    Details
    ISSN: 1432-0991
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract l-Serine dehydratase fromLactobacillus fermentum was purified 100-fold. It was stabilized by the presence of 1 mM l-cysteine in 50 mM phosphate buffer. Mr=150,000 was determined by gel filtration. The enzyme consists of four apparently identical subunits (Mr=40,000) that were observed after treatment with sodium dodecyl sulfate. The apparent Km forl-serine was 65 mM. Fe++ was required for the enzymatic activity, and the apparent Km value for this reaction was 0.55 mM. Maximum enzymatic activity was observed at 45°C and pH 8.0 in 50 mM phosphate buffer. At pH values different from the optimum, a positive cooperativity between substrate molecules was observed. The activation energy of the reaction was 11,400 and 22,800 cal × mol−1 for temperature values more than and less than 35°C respectively. The purified enzyme showed a maximum absorption between 400 and 420 nm, indicating the presence of pyridoxal-5′-phosphate (PLP) as a prosthetic group. The PLP concentration was 0.027 µmoles per milligram of protein. The data suggest that there is 1 mol of PLP for each protein subunit.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02092310
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  • 4
    Electronic Resource
    Electronic Resource
    Hydrogenolysis of n-butane on low-loaded Rh/TiO2, I. Catalysts obtained by ion exchange (1992)
    Springer
    Reaction kinetics and catalysis letters 47 (1992), S. 227-231 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Описывают активность катализатора Rh/TiO2 (0,6 вес.% Rh), приготовленного ионным обменом и восстановленного при различных скоростях нагрева, в гидрогенолизе н-бутана. Скорость нагрева не влияет на свойства катализатора: получены одинаковые дисперсности и активности. Углекислые остатки, образующиеся при высоких температурах, удаляют водородом при комнатной температуре, регенерируя, таким образом, активностя.
    Notes: Abstract The activity in n-butane hydrogenolysis of Rh/TiO2 (0.6 wt.% Rh) catalysts prepared by ion exchange and reduced at different heating rates is reported. The heating rate has no major effect on the properties of the catalysts (similar dispersions and activities are achieved). Carbonaceous residues formed at high temperature are removed by hydrogen at room temperature, thus leading to recovery of the activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02137654
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  • 5
    Electronic Resource
    Electronic Resource
    Hydrogenolysis of n-butane on low-loaded Rh/TiO2. II. Catalysts obtained by impregnation (1992)
    Springer
    Reaction kinetics and catalysis letters 47 (1992), S. 233-238 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Описывают активность Rh/TiO2 (0,6 вес. % Rh), приготовленного импрегнированием и qvосстановлением при различных скоростях нагрева, в гидрогенолизе н-бутана. Катализатор, восстановленныи при скорости 5 К/мин, в десять раз активнее катализатора, восстановленного при скорости нагрева 20 К/мин, несмотря на то, что величины дисперсности не отличаются в обоих случаях.
    Notes: Abstract The activity in n-butane hydrogenolysis of Rh/TiO2 (0.6 wt. % Rh) catalysts propared by impregnation and reduced at different heating rates is reported. The catalyst reduced at 5 K/min is ten times more active than that reduced at 20 K/min, despite the fact that the dispersion values are similar in both cases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02137655
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  • 6
    Electronic Resource
    Electronic Resource
    Calcia-supported lanthanide oxides for methane oxidation II. Catalytic properties (1992)
    Springer
    Reaction kinetics and catalysis letters 48 (1992), S. 391-395 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Окислы лантана и самария, нанесенные на CaO, приготовленные из нитратов или окислов лантанидов, тестировали в окислении метана. Образцы, приготовленные из окислов, более активны по отношению к полному окислению, а из нитратов — приводят в основном к продуктам C2 и C3.
    Notes: Abstract Lanthanum and samarium oxides supported on CaO, prepared from lanthanide nitrates or oxides, have been tested for methane oxidation. Samples prepared from the oxides are more active for total oxidation. Those from nitrates lead mainly to C2 and C3.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02162686
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  • 7
    Electronic Resource
    Electronic Resource
    Li/MgO catalysts. III. Effect of precursor salts on the catalytic activity in methane oxidative coupling (1992)
    Springer
    Reaction kinetics and catalysis letters 48 (1992), S. 455-460 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Реакции окислительного соединения метана исследовали на катализаторах Li/MgO, приготовленных из трёх различных предшественников MgO и карбоната или нитрата лития. В образцах, приготовленных из Li2CO3, остатки последнего на поверхности носителя благоприятствуют образованию окислов углерода.
    Notes: Abstract Oxidative coupling of methane has been studied on Li/MgO catalysts prepared from three different MgO precursors and from lithium carbonate or nitrate. In samples prepared from Li2CO3, the persistence of this on the support surface favors formation of carbon oxides.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02162694
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  • 8
    Electronic Resource
    Electronic Resource
    An FT-IR spectroscopic assessment of the surface basicity of calcia (1993)
    Springer
    Reaction kinetics and catalysis letters 49 (1993), S. 139-144 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Adsorption of formic acid on Ca(OH)2 calcined at increasing temperatures has been monitored by FT-IR spectroscopy. Adsorption takes places dissociatively, forming bidentate formate species, coordinated to surface Ca2+ ions. The basicity decreases as the outgassing temperature increases, due to removal of surface hydroxy groups.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02084040
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  • 9
    Electronic Resource
    Electronic Resource
    Li/MgO catalysts, I. Effect of precursor salts on their structural and surface properties (1991)
    Springer
    Reaction kinetics and catalysis letters 44 (1991), S. 469-473 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Твердые Li/MgO получены из MgO с помощью термического разложения Mg5(OH)2(CO3)4·4H2O или высаждением водных растворов нитрата магния с дальнейшим импрегнированием полученного осадка водными растворами карбоната или нитрата лития. Во всех случаях были получены непористые вещества. Удельная поверхностная площадь зависит от природы прекурсоров, а процесс MgO→Mg(OH)2→MgO является топотактическим.
    Notes: Abstract Li/MgO solids have been prepared from MgO, by thermal decomposition of Mg5(OH)2(CO3)4·4H2O or by precipitation from aqueous solutions of magnesium nitrate, and then impregnating the solid thus obtained with aqueous solutions of lithium carbonate or nitrate. Non-porous solids are obtained in all cases. Specific surface area development depends on the nature of the precursors, the MgO→Mg(OH)2→MgO process being topotactic.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02073017
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  • 10
    Electronic Resource
    Electronic Resource
    Li/MgO catalysts: II. A DTA and TG study of precursors (1991)
    Springer
    Reaction kinetics and catalysis letters 45 (1991), S. 35-39 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Описывают термическое разложение прекурсоров катализаторов Li/MgO, приготовленных их различных соединений Mg и Li. Помимо разложения LiNO3, а не Li2CO3, в обоих случаях наблюдается дегидратация и дегидроксилирование. Свойства твердых веществ коррелируют с плавлением и распределением LiNO3 или Li2CO3 на поверхности перед или после дегидроксилирования Mg(OH)2.
    Notes: Abstract The thermal decomposition of precursors of Li/MgO catalysts prepared from different Mg and Li compounds is reported. Dehydration and dehydroxylation is observed in both cases, in addition to decomposition of LiNO3, but not of Li2CO3. The properties of the solids are related to the melting and spreading of LiNO3 or Li2CO3 before or after Mg(OH)2 dehydroxylation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02078605
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