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  • 11
    Electronic Resource
    Electronic Resource
    DRS UV-Vis and EPR spectroscopy of hydroperoxo and superoxo complexes in titanium silicalite (1992)
    Springer
    Catalysis letters 16 (1992), S. 109-115 
    Details
    ISSN: 1572-879X
    Keywords: Titanium silicalite ; hydroperoxo and superoxo complexes ; DRS UV-Vis and EPR spectra
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The most important spectroscopic features in the UV-Vis of framework and extraframework Ti(IV) in titanium silicalite are briefly summarized. The spectroscopic manifestations of the complexes formed by framework Ti(IV) in presence of H2O2 are reported. The formation of EPR active species is also considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00764360
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  • 12
    Electronic Resource
    Electronic Resource
    XAFS study of Ti-silicalite: structure of framework Ti(IV) in presence and in absence of reactive molecules (H2O, NH3) (1994)
    Springer
    Catalysis letters 26 (1994), S. 195-208 
    Details
    ISSN: 1572-879X
    Keywords: zeolite ; Ti-silicalite ; XAFS ; XANES ; pre edge absorption ; EXAFS
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract X-ray absorption at the Ti K edge (both XANES and EXAFS) of a very pure Ti-silicalite containing a small fraction of Ti(IV) substituting Si(IV), has been performed in order to study the effect of the presence or absence of ligands such as H2O and NH3 on the Ti(IV) coordination sphere. In particular, the effect of an outgassing treatment at 400 K and of the interaction with NH3 has been studied and described in detail. It has been found that the Ti(FV) is fourfold coordinated in the samples outgassed at 400 K and expands its coordination sphere number under the action of adsorbates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00824045
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  • 13
    Electronic Resource
    Electronic Resource
    The interaction of ruthenium with a MgO matrix (1983)
    Springer
    Journal of thermal analysis and calorimetry 26 (1983), S. 81-86 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Proben von auf MgO aufgebrachten Ruthenium wurden hergestellt und durch temperaturprogrammierte Reduktion untersucht. Es wurden verschiedene TPR-Peaks beobachtet und deren Zuordnung zu reduzierbare Ionen enthaltenden chemischen Species diskutiert.
    Abstract: Резюме Получены и исслудова ны методом термическ ого программированного восстановления (ТПВ) образцы рутения н а подложке из MgO. Обсужх ено отнесение наблюдаем ых ТПВ-пиков к химически м частицам, содержащи х восстанавдиваемые и оны.
    Notes: Abstract Ruthenium samples supported on MgO have been prepared and investigated by Thermal Programmed Reduction. Several TPR peaks have been observed and their assignment to chemical species containing reducible ions has been discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01914091
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  • 14
    Electronic Resource
    Electronic Resource
    Co-precipitated RuO2-Al2O3 catalysts: bulk and surface characterization (1980)
    Springer
    Journal of materials science 15 (1980), S. 2559-2568 
    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 A series of co-precipitated RuO2-Al2O3 samples was characterized by means of bulk and surface techniques such as X-ray diffraction (XRD), specific surface area measurements, X-ray photoelectron spectroscopy (XPS) and Auger electron spectroscopy (AES). The existence of a substitutional solid solution of Al3+ ions in RuO2 is suggested on the basis of XRD results. A more detailed study of such a phase was hindered by its thermal instability. XPS and AES quantitative data indicate a strong enrichment of Al on the surface. A simple model based on a reciprocal masking action of the particles of the two oxides with respect to the primary beam (X-rays or electrons) was found to fit the surface composition data well.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00550760
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  • 15
    Electronic Resource
    Electronic Resource
    Das Phasendiagramm des Systems TeO2-MoO3 (1981)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 474 (1981), S. 229-232 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Phase Diagram of the System TeO2—MoO3The phase equilibrium diagram of the system TeO2—MoO3 has been studied using differential thermal analysis. It is shown that a new congruently melting phase, Te2MoO7, is formed (m. p. 551°C). The eutectics were found at 526°C near 55.5 mole% TeO2 and at 543%C near 67.5 mole% TeO2. The compound Te2MoO7 shows glass-forming tendency.
    Notes: Das Phasendiagramm des Systems TeO2—MoO3 wird durch Differentialthermoanalyse untersucht. Es wird nachgewiesen, daß eine neue kongruentschmelzende Phase Te2MoO7 (Schmelztemperatur 551°C) gebildet wird. Zwei Eutektika werden bei 526°C für etwa 55,5 mol-% TeO2 und bei 543°C für etwa 67,5 mol-% TeO2 gefunden. Die Verbindung Te2MoO7 zeigt eine Neigung zur Glasbildung.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19814740325
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  • 16
    Electronic Resource
    Electronic Resource
    Compound Formation in the Systems TeO2—SeO2 and TeO2—SeO2—H2O (1984)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 509 (1984), S. 183-191 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Verbindungsbildung in den Systemen TeO2—SeO2 und TeO2—SeO2—H2ODie Reaktion zwischen TeO2 und SeO2 in Inertgasatmosphäre im Temperaturbereich von 300 bis 350°C wurde röntgenographisch untersucht und eine Verbindungsbildung beobachtet. Das weiße Reaktionsprodukt α-TeSeO4 ist nicht isostrukturell mit den Ausgangsoxiden. Die Verbindung ist bei Zimmertemperatur unter Feuchtigkeitsausschluß völlig beständig. Bei etwa 320°C findet Zersetzung zu TeO2 und SeO2 statt. Die Bildung von 3 TeO2 · SeO2 · nH2O und anderen Hydraten der gemischten Oxide im System TeO2—SeO2—H2O wurde nachgewiesen, ihre charakteristischen d-Werte werden angegeben.
    Notes: The solid state reaction between TeO2 and SeO2 in inert atmosphere was studied by x-ray diffraction techniques and compound formation was observed. The pale-white reaction product α-TeSeO4, obtained at 300°C, is not isostructural with the component oxides. The substance is stable at room temperature under exclusion of moisture but decomposes above about 320°C in dry atmosphere. Evidence is given for the formation of 3 TeO2 · SeO2 · nH2O and other hydrated mixed oxides in the system TeO2—SeO2—H2O; d-spacings are reported.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19845090220
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  • 17
    Electronic Resource
    Electronic Resource
    Compound Formation in the System SeO2—V2O5 (1976)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 422 (1976), S. 179-181 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Verbindungsbildung im System SeO2—V2O5Die Reaktion zwischen SeO2 und V2O5 in Inertgasatmosphäre wurde röntgenographisch untersucht und eine Verbindungsbildung beobachtet. Das dunkelrote Reaktionsprodukt Se2V2O9 ist nicht isostrukturell mit der entsprechenden Tellurverbindung. Oberhalb 400°C zerfällt die Verbindung in ihre Oxide.
    Notes: The solid-state reaction between SeO2 and V2O5 in inert atmosphere was studied by x-ray diffraction techniques, and compound formation was observed. The dark red reaction product Se2V2O9 is not isostructural with the corresponding tellurium compound. Above about 400°C the substance decomposes into its component oxides.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19764220210
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  • 18
    Electronic Resource
    Electronic Resource
    Tellurium-Niobium Oxides (1980)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 466 (1980), S. 81-86 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Tellur-Niob-OxideDie Reaktion zwischen TeO2 und Nb2O5 in Temperaturbereich von 500 bis 850°C wurde röntgenographisch untersucht. Folgende weiße Verbindungen wurden oberhalb etwa 525°C beobachtet: TeO2 · 3Nb2O5, 3TeO2 · Nb2O5 und 4TeO2 · Nb2O5. Das System TeO2—Nb2O5 ist von komplexerer Art als das einfache binäre System TeO2—V2O5, ist jedoch auch ganz verschieden von TeO2—Ta2O5. Keine isostrukturellen (Te, V)O-, (Te, Nb)O- und (Te, Ta)O-Verbindungen wurden beobachtet.
    Notes: The solid-state reaction between TeO2 and Nb2O5 was studied by means of X-ray powder diffraction, at room temperature, using samples prepared in the interval of 500°C to 850°C. Several whitish coloured stable mixed oxide phases have been found, corresponding to the formulas TeO2 · 3Nb2O5, 3TeO2 · Nb2O5 and 4TeO2 · Nb2O5. The phase distribution differs from that in TeO2—V2O5 and TeO2—Ta2O5 systems and no isomorphism relationships with phases in these oxide systems have been noticed.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19804660110
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  • 19
    Electronic Resource
    Electronic Resource
    Study of CuCl2 Supported on SiO2 and Al2O3 (1983)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 502 (1983), S. 199-208 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Untersuchung von CuCl2/SiO2- und Al2O3-Träger-KatalysatorenDie Natur und Stabilität von Oberflächenspezies des CuCl2 auf α-Al2O3, γ-Al2O3 und SiO2 wurden mittels Röntgendiffraktometrie und Reflexionsspektroskopie untersucht. An inertem α-Al2O3-Träger wird keine spezifische chemische Wechselwirkung mit CuCl2 beobachtet im Gegensatz zu den hydratisierten Trägern SiO2 und γ-Al2O3. Bei diesen Trägern besteht die Koordinationssphäre des Cu2+ aus Oberflächengruppen (OH- oder O- nach Trocknung bzw. Aktivierung), H2O und Cl-; mit abnehmender Konzentration an H2O-Liganden im Verlauf von Tränkung, Trocknung und Glühen.γ-Al2O3-Proben, geglüht bei 400°C, zeigen γ-Cu2(OH)3Cl gegenüber CuAl2O4 bei höheren Temperaturen. Das Fehlen von Cu2(OH)3Cl auf SiO2 ist auf die Säure-Base-Eigenschaft der Träger zurückzuführen. Die verschiedenen Träger können in folgender Stabilitätsreihe der gebildeten Oberflächenkomplexe angeordnet werden: γ-Al2O3 〉 SiO2 ≫ -Al2O3.
    Notes: The nature and stability of surface species of CuCl2 supported on α-Al2O3, γ-Al2O3, and SiO2 were investigated by using X-ray diffraction techniques and reflectance spectroscopy. No specific chemical interaction of CuCl2 is observed on an inert α-Al2O3 support, as opposed to hydrated carriers as SiO2 and γ-Al2O3. On these supports the coordination sphere of Cu2+ consists of surface groups (OH- or O- at drying and activation, resp.), H2O and Cl-, with the H2O ligands decreasing in concentration in the process of impregnation, drying and calcination.γ-Al2O3 samples, calcined at 400°C, show γ-Cu2(OH)3Cl as opposed to CuAl2O4 at higher temperatures. The absence of Cu2(OH)3Cl on SiO2-supported samples is related to the acid-base characteristics of the carriers. The various supports can be arranged in the following order of stability of the complexes formed: γ-Al2O3 〉 SiO2 ≫ -Al2O3.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19835020727
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  • 20
    Electronic Resource
    Electronic Resource
    Tellurium-Tantalum Oxides (1980)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 465 (1980), S. 51-58 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Tellur-Tantal-OxideDie Reaktion zwischen TeO2 und Ta2O5 im Temperaturbereich von 500 bis 900°C wurde röntgenographisch untersucht. Die farblosen Verbindungen 3TeO2 · Ta2O5, 7TeO2 · 3 Ta2O5 und 2TeO2 · Ta2O5 wurden beobachtet. Das Reaktionsprodukt 2TeO2 Ta2O5 (in zwei verschiedenen Kristallmodifikationen) ist nicht isostrukturell mit der entsprechenden Vanadium Verbindung. Die Umwandlungsbedingungen der einzelnen Phasen ineinander werden besprochen. Stabilitätsbereiche sind: 〈850°C, 3TeO2 · Ta2O5; 700-900°C, 7TeO2 · 3Ta2O5; 〉850°C, 2TeO2 · Ta2O5 (H); 700-800°C, 2TeO2 · Ta2O5 (L).
    Notes: The rather complex mixed oxide system TeO2—Ta2O5 has been studied by means of x-ray powder diffraction, at room temperature, using samples prepared in the interval of 500 to 900°C. Four whitish coloured stable mixed oxide phases have been found, corresponding to the formulas 3TeO2 · Ta2O5, 7TeO2 · 3Ta2O5 and 2TeO2 · Ta2O5 ( in a low and high temperature form). The latter compound is not isostructural with 2TeO2 V2O5. Approximate stability ranges are: up to 850°C, 3TeO2 · Ta2O5; 700-900°C, 7TeO2 · 3Ta2O5; 850°C and higher, 2TeO2 · Ta2O5 (H); 700-800°C, 2TeO2 Ta2O5 (L).
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19804650106
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