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  • 1
    Digitale Medien
    Digitale Medien
    High-pressure hydrogenation of nitrile rubber: thermodynamics and kinetics (1991)
    s.l. : American Chemical Society
    Industrial & engineering chemistry research 30 (1991), S. 1086-1092 
    Details
    ISSN: 1520-5045
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ie00054a003
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  • 2
    Digitale Medien
    Digitale Medien
    One-Step Catalytic Conversion of Ethanol to Butadiene in a Fluidized Bed (1963)
    s.l. : American Chemical Society
    Industrial and engineering chemistry 2 (1963), S. 45-51 
    Details
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/i260005a010
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  • 3
    Digitale Medien
    Digitale Medien
    Thermal studies on aluminium substituted CuCr2O4 (1989)
    Springer
    Journal of thermal analysis and calorimetry 35 (1989), S. 1079-1082 
    Details
    ISSN: 1572-8943
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung Mittels DSC wurde ein aluminium-substituiertes Kupferchromitspinelloxid, CuCr2−x Al x O4 mitx=0,2-0,8 thermisch untersucht. Wird 20% des Cr durch Al ersetzt, sinkt die Phasenübergangstemperatur ab, bei weiterem Anwachsen des Aluminiumgehaltes steigt sie jedoch über die von CuCr2O4 hinaus an. Die Enthalpieänderung des Phasenüberganges steigt mit anwachsendemx allmählich an.
    Kurzfassung: Резюме Проведенное методо м ДСК термическое исследование алюми ний замещенной хромитмедной шпине ли CuCr2−x Al x O4 (x=0,2–0,8) показало, что при 20% замещении х рома на алюминий, температу ра фазового переход а шпинели понижается, но при да льнейшем увеличении процент ного содержания алюм иния, температура фазовог о перехода становит ся более высокой, чем д ля CuCr2O4. Однако, изменен ие энтальпии фазового перехода постоянно уменьшается с увел ичениемx.
    Notizen: Abstract Thermal studies on aluminium substituted copper chromite spinel oxide, CuCr2−x Al x O4 (x=0.2 tox=0.8) by DSC show that with 20% replacement of Cr by Al, the phase transition temperature of the spinel is lowered but on further increasing the percentage of Al the phase transition temperature becomes higher than that of CuCr2O4. The enthalpy change for phase transition however decreases gradually with increasingx.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01913023
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  • 4
    Digitale Medien
    Digitale Medien
    Synthesis and characterization of indium intercalation compounds of molybdenum diselenide, In x MoSe2 (0≤x≤1) (1989)
    Springer
    Journal of materials science 24 (1989), S. 1919-1924 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract The present work deals with the synthesis, structure and properties of indium intercalated compounds of molybdenum diselenide, In x MoSe2 (0≤x≤1). X-ray analysis shows that the intercalated compounds, In1/3MoSe2 like the host. 2H−MoSe2 also possess a hexagonal symmetry with a small increase inc lattice parameter. However, a new phase appeared in In2/3MoSe2 and InMoSe2 diffractogram due to In7Se6, In2Se3, In x Mo6Se8 or In3.33Mo15Se19. Room temperature magnetic susceptibility, thermoelectric power experiments and two probe conductivity measurements in the temperature range 25 to 300°C indicated that intercalated compounds also exhibit p-type diamagnetic semiconducting behaviour similar to the host MoSe2 and results are explained on the basis of existing band models. Thermal stability behaviour of these compounds has also been studied and X-ray analysis of the oxidized product has also been made.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02385399
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  • 5
    Digitale Medien
    Digitale Medien
    Preparation, structure and properties of transition metal trichalcogenides (1992)
    Springer
    Journal of materials science 27 (1992), S. 3693-3705 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract In recent years, the transition metal trichalcogenides (TX3) of Group IVB, VB and VIB have received much more attention because of the considerable diversity in their physical properties. The most striking feature of these compounds is that the structure here may be classified into three types depending on the number of different TX3 chains present in the unit cell. Thus ZrSe3, TaSe3 and NbSe3 are the representative compounds having one, two and three types of chain based on the different bond lengths for the (X2)2− pairs in the base of the TX3 trigonal prismatic framework. A similar model is also applicable in the case of NbS3, with the addition of a 2b-superstructure associated with the formation of niobium pairs. The chain structure also facilitates the process of intercalation which has been most effectively used in secondary batteries. These compounds exhibit the superconductivity phenomena and charge density wave, etc. and also find application in photoelectrochemical cells. An attempt has been made here to review the up-to-date chemistry of transition metal trichalcogenides related with their preparation, structure and properties such as physical and chemical, thermodynamic, electrical, magnetic and optical properties, intercalation and use in the photoelectrochemical cells. 93
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00545445
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  • 6
    Digitale Medien
    Digitale Medien
    Layer type tungsten dichalcogenide compounds: their preparation, structure, properties and uses (1985)
    Springer
    Journal of materials science 20 (1985), S. 3801-3815 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract Tungsten dichalcogenides constitute a well defined family of compounds which crystallize in a layer type structure. These compounds find a wide range of applications in the field of catalysis and as a lubricant at high temperatures and pressures. They have also been investigated successfully as cathode and anode materials in photoelectrochemical cells for solar energy conversion. The layered tungsten dichalcogenides also exhibit superconducting behaviour when intercalated with alkali or alkaline earth metals and different divalent rare earth metals. In the present paper an attempt has been made to review the preparation, crystal structure and band models of tungsten dichalcogenides. Furthermore, we have tried to incorporate the physical, chemical, optical and electrical properties along with intercalation, thermal stability and uses of these compounds.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00552369
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  • 7
    Digitale Medien
    Digitale Medien
    Preparation and characterization of molybdenum disulphide catalysts (1993)
    Springer
    Journal of materials science 28 (1993), S. 5032-5035 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract Molybdenum disulphide has been prepared by atmospheric-pressure hydrogen reduction of molybdenum trisulphide in the temperature range 400–750 °C for 4 h and characterized. Chemical analysis of the product confirmed the S to Mo ratio 2.00 as desired for MoS2, consistent with its thermogravimetric analysis data in an air atmosphere. MoS2 prepared under these reducing conditions possessed a hexagonal structure with n-type diamagnetic semiconducting behaviour and a lower surface area. The catalytic activity of the MoS2 was studied for liquid-phase hydrogenation of nitrobenzene. X-ray studies on MoS3 when reduced at 750 °C for 48 h indicated that MoS2 so formed is unstable, resulting in the formation of its over-reduced products Mo2S3 and Mo.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00361173
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  • 8
    Digitale Medien
    Digitale Medien
    Preparation of molybdenum trisulphide by solid state chemical reactions (1984)
    Springer
    Journal of materials science 3 (1984), S. 313-314 
    Details
    ISSN: 1573-4811
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00729382
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  • 9
    Digitale Medien
    Digitale Medien
    Hydroformylation of nitrile rubber and its characterization (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 198 (1992), S. 1-14 
    Details
    ISSN: 0003-3146
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Beschreibung / Inhaltsverzeichnis: Nitrilkautschuk (NBR) wurde mit trans-Chlorcarbonylbis(tripheny1phosphin)rhodium(1) [trans-RhCI(CO)(PPh3)2] und Hydridocarbonyltris(triphenylphosphin)rhodium(1) [RhH (CO)(PPh3)3] als Katalysatoren in homogener Lösung selektiv hydroformyliert. Bei der Hydroformylierung von NBR mit 40 mol-% Acrylnitril bei 363 K, 5,6 MPa Gasdruck (CO:H2 = 1:1) und mit 0,43 mmol Katalysator werden mit trans-RhCl(CO)(PPh3)2 25% und mit RhH (CO)(PPh3)3 30% Umsatz erreicht. Beide Reaktionen sind bezüglich der Olefin- und Katalysatorkonzentration pseudo-erster Ordnung. Mit RhH (CO)(PPh3)3 wird eine höhere Reaktionsgeschwindigkeit erhalten. Die IR- und NMR-spektroskopische Charakterisierung der Produkte zeigt, daß sowohl die 1,4- als auch die 1,2-Butadieneinheiten hydroformyliert werden. Mit steigendem Aldehydgruppengehalt sinkt die Grenzviskositatszahl [q] und steigt die Glastemperatur. Bei hoheren Hydroformylierungsgraden wird Gelbildung beobachtet.
    Notizen: Selective homogeneous catalytic hydroformylation of nitrile rubber (NBR) has been carried out in presence of trans-chlorocarbonylbis(triphenylphosphine)rhodium(I) [trans-RhCl(CO)(PPh3)3] and hydridocarbonyltris(triphenylphosphine)rhodium(I) [RhH(CO)(PPh3)3] as catalysts. At 363 K, under 5.6 MPa pressure (CO:H2 = 1:1) in presence of 0.43 mmol/l catalyst, the amount of hydroformylation is 25% in the case of trans-RhCl(CO)(PPh3)2 and 30% in the case of RhH (CO)(PPh3)3 for NBR with 40 mol-% acrylonitrile. Reaction kinetics suggest that both the reactions are pseudo-first order with respect to olefinic substrate and catalyst concentration. The rate of the reaction is higher in the case of RhH(CO)(PPh3)3. The characterization of the products by IR and NMR spectroscopy shows the formation of internal aldehyde groups from 1,4-units and terminal branched aldehyde groups from 1,2-units of the copolymer. Measurements on intrinsic viscosity [η] and glass transition temperature (Tg) suggest a decrease in [η] and an increase in Tg with the degree of formyl functionalization. Gel formation has been observed at higher degree of hydroformylation.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/apmc.1992.051980101
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  • 10
    Digitale Medien
    Digitale Medien
    Hydrogenation of liquid carboxylated nitrile rubber (1992)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 193 (1992), S. 659-667 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: Hydrogenation of liquid carboxylated nitrile rubber (L-XNBR) was carried out using homogeneous palladium and rhodium catalysts. It was observed that the six-membered cyclic palladate complex of 2-benzoylpyridine, 1, reduces the carbon-carbon double bonds without affecting the nitrile and carboxyl functionality. The intrinsic viscosity of the polymers remains unchanged during hydrogenation. The glass transition temperature is marginally lowered for the hydrogenated products. A great extent of decarboxylation was obtained for samples hydrogenated in presence of the rhodium complex, 2.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1992.021930311
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