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    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.
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  • 3
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Гидрогенолиз углеводородов состава C2 до C4 на Rh/TiO2 (2,5 вес. % Rh) исследовали на окисленных и вновь восстановленных катализаторах. После восстановления и окисления при 773 К, восстановление при низких температурах увеличивает активность, которая уменьшается при увеличении температуры ревосстановления. Определены параметры реакции (энергия активации и частотный фактор).
    Notes: Abstract Hydrogenolysis of C2 to C4 hydrocarbons on Rh/TiO2 (2.5 wt. % Rh) has been studied on catalysts oxidized and rereduced. After reduction and oxidation at 773 K, reduction at lower temperatures increases the activity, but this decreases as the re-reduction temperature increases. The reaction parameters (activation energy and frequency factor) have been determined.
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  • 4
    ISSN: 1432-0991
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The effect of saturated fatty acids from 6∶0 to 16∶0 and oleic acid was determined onLactobacillus leichmannii growing in skim milk. The growth of this strain was markedly inhibited by fatty acids from 8∶0 to 12∶0 but not by straight chain fatty acids greater than 13∶0 or less than 7∶0 and oleate. Laurate was the fatty acid with the highest bactericidal effect. Similar results, with little changes depending on strains, were obtained withL. casei, L. plantarum, L. bulgaricus, L. lactis, L. helveticus. Mutants from theseLactobacillus organisms, resistant to fatty acid inhibition, were isolated by a recycling selection procedure. These mutants exhibited high levels of oxidation for laurate. The presence of 2 mM of this compound in the skim milk culture increased the fatty acid oxidation activity four to ten times higher than was exhibited by the parent strains. The practical implications of these observations are discussed.
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  • 5
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Гидрогенолиз углеводородов состава C2 до C4 исследован на Rh/TiO2 (2,5 вес .% Rh), восстановленном в H2 при 773 К. Активность катализатора в этой реакции наблюдалась выше 480 К, приводя к образованию более низких углеводородов с увеличением температуры реакции.
    Notes: Abstract Hydrogenolysis of C2 to C4 hydrocarbons has been studied on Rh/TiO2 (2.5wt. % Rh) reduced in H2 at 773 K. Activity for this reaction is observed above 480 K, leading to lower hydrocarbons as the reaction temperature is increased.
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  • 6
    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.
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  • 7
    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.
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  • 8
    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.
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  • 9
    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.
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  • 10
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Ln2O3-CaO systems, where Ln=La, Sm, have been prepared by impregnation of calcia with aqueous solutions of Ln nitrates or by mixing both oxides. Decomposition at 1073 K leads to a slight decrease in the specific surface area when starting from Ln2O3, but to a sharp decrease when starting from the nitrates.
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