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  • 1975-1979  (8)
  • Chemistry  (8)
  • 99m-Tc-HMPAO-SPECT imaging
  • APC resistance
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 433 (1977), S. 284-286 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Influence of the Heat Treatment of the Basic Glass on the Properties of Porous GlassesThe influence of the heat treatment of the basic glass has been studied in respect to the carrier properties of porous glasses for platinum (1 wt.-%) for dehydrocyclization of n-hexane. Connections between heat treatment micropore structure and catalytic activity are discussed.
    Notes: Es wurde der Einfluß der thermischen Vorbehandlung des Ausgangsglases (7% Na2O, 23% B2O3, 70% SiO2) auf die Trägereigenschaften poröser Gläser für Platin (1 Gew.-%) bei der Dehydrocyclisierung von n-Hexan untersucht. Zusammenhänge zwischen Thermobehandlung, Mikroporenstruktur und katalytischer Aktivität werden diskutiert.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 432 (1977), S. 242-248 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Hydrogenation of Hydrocarbons on Catalysts of the System Porous Glass-MetalThe hydrogenation of hydrocarbons such as cyclohexen, benzene and styrene on metal catalysts (Ni, Pd, Pt) supported by porous glasses and zeolites was investigated in the gasphase.In dependence on the pore structure catalysts of the type porous glass-metal are able to a shape selective catalysis like zeolite catalysts.
    Notes: Die Hydrierung von Kohlenwasserstoffen, wie Cyclohexen, Benzol und Styrol wurde in der Gasphase an Metall-Trägerkatalysatoren (Ni, Pd, Pt) auf der Basis von porösen Gläsern und Zeolithen untersucht.In Abhängigkeit von der Porenstruktur zeigen Katalysatoren des Typs poröses Glas-Metall die Fähigkeit zu einer formselektiven Katalyse wie Zeolith-Katalysatoren.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 432 (1977), S. 249-252 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Oxidation of CO over Catalysts Supported by Porous GlassesIt is reported on the catalytic activity of metal catalysts (Ag, Mn, Ni, Cu/Zn, Fe/Cr) supported by porous glasses for the oxidation of CO. In comparison with impregnated carrier catalysts metal catalysts prepared by ionexchange of porous glasses (Ag+) show a higher activity for oxidation of CO.The preparation of ionexchanged forms of porous glasses is described.
    Notes: Es wird über die katalytische Aktivität von Metallkatalysatoren (Ag, Mn, Ni, Cu/Zn, Fe/Cr) auf der Basis poröser Gläser bei der Oxydation von CO berichtet. Im Vergleich zu imprägnierten Metall-Trägerkatalysatoren zeigen die durch Ionenaustausch von porösen Gläsern mit Metallionen (Ag+) hergestellten Metall-Trägerkatalysatoren eine höhere Aktivität für die Oxydation von CO.Die Herstellung ionenausgetauschter Formen poröser Gläser wird beschrieben.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 457 (1979), S. 224-228 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Ion Exchange of Monovalent Cations in Synthetic Sodium Polysilicates with Layer StructureCation-exchange equilibria of synthetic sodium polysilicates Ilerit (Na2O · 8.3SiO2 8.9 H2O) and Magadiite (Na2O · 13 SiO2 · 6.8 H2O) with H+, Li+ and K+ Ions were investigated with respect to their selectivity behaviour. The range of ion selectivity is: H+ 〉 Na+ 〉 Li+ 〉 K+. Thermodynamic data ΔG, ΔH, and ΔS were determined by means of the integral thermodynamic equilibria constants Kth of the ion-exchange reactions.
    Notes: Die Kationenaustauschgleichgewichte der synthetischen Natriumpolysilicate Ilerit (Na2O · 8,3 SiO2 · 8,9 H2O) und Magadiit (Na2O · 13 SiO2 · 6,8 H2O) mit H+—, Li+- und K+-Ionen wurden im Hinblick auf ihre Selektivitätsverhalten untersucht. Es resultiert folgende Ionenselektivitätsabstufung: H+ 〉 Na+ 〉 Li+ 〉 K+. Die thermodynamischen Größen ΔG, ΔH und ΔS wurden über die integrale thermodynamische Gleichgewichtskonstante Kth der Ionenaustauschreaktionen bestimmt.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 434 (1977), S. 297-304 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Modification of Xerogels by Acid TreatmentThe influence of an acid treatment on the texture and structure of silica (xerogel) has been studied. Characteristic changes caused by acid treatment of silica consist of increasing pore-volume decreasing specific surface and of a maximum shift to larger radii of pore distribution in the range of micro and meso pores.A tendency in respect to an increasing degree of order for acid treated silica could be shown.
    Notes: Der Einfluß einer Säurebehandlung auf die Textur und Struktur von Kieselgelen (Xerogelen) wurde untersucht. Die charakteristischen Veränderungen an säurebehandelten Kieselgelen bestehen aus einer Abnahme der spezifischen Oberfläche der Zunahme des spezifischen Porenvolumens und einer Verschiebung der Maxima der Porenradienverteilungskurven  -  im Bereich der Mikro- und Mesoporen  -  zu größeren Porenradien.Eine Tendenz zur Erhöhung des Ordnungsgrades säurebehandelter Kieselgele konnte nachgewiesen werden.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 50 (1978), S. 956-957 
    ISSN: 0009-286X
    Keywords: Heterogene Katalyse ; Platin-Trägerkatalysatoren ; Bimetall-Katalysatoren ; Dispersität ; Aromatisierung ; Hydrogenolyse ; Aromatisierung ; n-Hexan ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 321 (1979), S. 529-536 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Decomposition of tert.-Butyl Hydroperoxide by ZeolitesZeolites catalyze the decomposition of tert.-butyl hydroperoxide in the liquid-phase. Structure, cation and degree of ion-exchange influence the catalytic activity of the zeolithe. The highest rates of the decomposition were obtained by means of zeolites containing transition metal cations. It is possible to use the decomposition of tert.-butyl hydroperoxide, catalyzed by zeolites, for the epoxidation of olefins.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 30 (1979), S. 426-431 
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The time-dependence of the permeation of methanol vapour through tenside-alginate foam lamels was determined by measuring the permeation, diffusion and solubility coefficients. Steady-state transport was found to occur only within narrow time limits. The agreement of calculated and experimental relationships between the coefficients suggest solution diffusion as proposed by BARRER. The transport mechanism can be explained by the place exchange theory and by the cluster theory according to LUCK.
    Notes: Für Tensid/Alginat-Schaumlamellen wurde der Durchtritt von Methanoldampf an Hand der Permeations-, Diffusions-und Löslichkeitskoeffizienten in Abhängigkeit von der Zeit ermittelt. Stationäre Transportzustände existieren nur in engen Zeitintervallen. Aus der Übereinstimmung zwischen den berechneten und experimentell ermittelten Koeffizienten-Beziehungen wird auf eine Lösungsdiffusion nach BARRER geschlossen. Der Transportmechanismus kann auf der Grundlage der Platzwechseltheorie sowie der Cluster-Theorie nach LUCK gedeutet wurden.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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