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  • Inorganic Chemistry  (2)
  • structure of Li1−x HAlO2 catalyst  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Characterization of the Li1−x H x AlO2 system; 0.00 ⩽x ⩽ 0.90 (1992)
    Springer
    Catalysis letters 12 (1992), S. 139-146 
    Details
    ISSN: 1572-879X
    Keywords: Catalysis by Li1−x HAlO2 ; structure of Li1−x HAlO2 catalyst ; reactions of 2-propanol on Li1−x HAlO2
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The mechanism of cation replacement in the Li1−x H x AlO2; 0.00 ⩽x ⩽ 0.90 system was investigated with XRD. Examination of the peak position and intensity associated with the 018 and 110 Bragg reflections $$(R\bar 3m)$$ in a series of partially replaced samples showed that the cation replacement process proceeded by a two phase mechanism. Catalytic characterization of αLiAlO2 with the 2-propanol probe reaction revealed the formation of the condensation products methyl-cyclopentene, 4-methyl-2-pentanone, and 4-methyl-2-pentanol. These products were seen in addition to propylene and acetone. Catalytic characterization of Li1−x H x AlO2;x = 0.90 with 2-propanol showed a significant decrease in condensation activity and no change in the propylene/acetone ratio relative to αLiAlO2. This suggests that the decrease in the amount of lithium eliminated the basic sites necessary for the condensation reactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00767196
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  • 2
    Electronic Resource
    Electronic Resource
    Synthesis and structures of Sc7Cl12 and Zr6Cl15Dedicated to professor Rudolf Hoppe on his 60th birthday (1982)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 491 (1982), S. 51-59 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The indicated nine-electron clusters of scandium and zirconium are formed in transport reactions at 880/900°C and 750/600°C, respectively. Sc7Cl12 (R¯3, a - 12.959(2), c - 8.825(2), Z - 3) can be described as c.c.p. Sc6Cl12 clusters with isolated metal atoms in all octahedral interstices or as Sc3+(Sc6Cl6iCl6i-a) 3- with Sc3+ in Cli octahedra between Sc6Cl123- sheets. Metal-metal distances within the cluster are 3.201-3.230(2) Å. Zr6Cl12iCl6/3a crystallizes in the Ta6Cl15 structure (Ia3d, a - 21.141(3) Å, Z - 16) with d(Zr—Zr) = 3,199-3.214(4) Å. Apparent residual electron density is found in the center of both clusters, amounting to Z∼7.6 (Sc) and ∼6 (Zr) based of refinement of oxygen in these positions. The effect is thought to probably arise from errors in the diffraction data rather than partial incorporation of light nonmetal atoms such as oxygen or fluorine. Observed metal-metal distances are compared with those in other clusters.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19824910108
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  • 3
    Electronic Resource
    Electronic Resource
    Synthesis, structure, and properties of LaSrCuGaO5Dedicated to Professor Hans-Georg von Schnering on his 60th Birthday (1991)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 598 (1991), S. 327-338 
    Details
    ISSN: 0044-2313
    Keywords: Lanthanum strontium copper gallate ; preparation ; crystal structure ; magnetic susceptibility ; electrical resistivity ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Präparation, Struktur und Eigenschaften von LaSrCuGaO5Die neue Brownmillerit-verwandte Verbindung, LaSrCuGaO5, wird dargestellt und charakterisiert. Sie kristallisiert in der orthorhombischen nicht-zentrosymmetrischen Raumgruppe Ima2.Die Gitterparameter sind a = 16,383(1) Å, b = 5,5293(7) Å, c = 5,3275(6) Å. Die Struktur ist der des Perowskits verwandt, enthält aber geordnete Sauerstoffleerstellen in den zweidimensionalen Gallium-Sauerstoff-Schichten, was zur tetraedrischen Koordination der Gallium-Kationen führt. Andere wichtige Strukturmerkmale sind die gewellten Kupfer-Sauerstoff-Ebenen und die statische Verteilung der Lanthan- und Strontium-Kationen über die A-Lage. Genaue Gitterkonstanten-Bestimmungen zeigen eine Dehnung der a-Achse um 0,17 Å bei Dotierung mit Strontium La1-xSr1-xCuGaO5 (xmax = 0,13). Messungen der magnetischen Suszeptibilität zeigen, daß die Verbindung bis zu 4 K paramagnetisch bleibt.
    Notes: The new brownmillerite-related compound, LaSrCuGaO5, has been synthesized and characterized. It crystallizes in the orthorhombic non-centrosymmetric space group Ima2. The unit cell dimensions are a = 16.383(1) Å, b = 5.5293(7) Å, c = 5.3275(6) Å. The structure is related to perovskite but contains ordered oxygen vacancies within the two-dimensional gallium oxygen layers resulting in tetrahedral coordination of the gallium cations. Other important structural features include buckled copper-oxygen planes, and disorder of the lanthanum and strontium cations over the A-site. Accurate lattice constant measurements reveal an a-axis expansion of 0.17 Å when doped with strontium La1-xSr1+xCuGaO5 (xmax = 0.13). Magnetic susceptibility measurements demonstrate that the compound remains paramagnetic to 4 K.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19915980130
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