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  • 1
    Electronic Resource
    Electronic Resource
    Analysis of Mixtures of Organic Acids by Extraction (1949)
    s.l. : American Chemical Society
    Analytical chemistry 21 (1949), S. 818-821 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac60031a018
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A novel synthesis of 1,21-heneicosanedioic acid (1980)
    s.l. : American Chemical Society
    The @journal of organic chemistry 45 (1980), S. 4785-4786 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo01311a052
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  • 3
    Electronic Resource
    Electronic Resource
    On the structure-function relationship of nitrogenase M-cluster and P-cluster pairs (1995)
    Springer
    Journal of cluster science 6 (1995), S. 485-501 
    Details
    ISSN: 1572-8862
    Keywords: Nitrogenase MoFe-protein ; M-cluster cage ; molecular-sieve effects ; substrates binding modes ; homocitrate-mediated proton-transport relay
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract It A proposed that the M-cluster cage (Kim-Rees model) in active N2-ase can exert shape-selective “molecular-sieve” effects in molecular recognition of exogenous substrates, by providing inside multinuclear active-sites the cavity for N2, C2H2, cyclopropene, and N2O reduction, with [Mo-3Fe]-site available only for N2 reduction: on the other handn-RC— CH,n-RC— N,n-RN-C , C—N− and N3 −, are bound outside the cavity at the [2Fe]-site left by the labilizable ligand “Y”. A terminal carboxylate of the Mo-bound (R)-homocitrate is just in position to protect a H2-evolution site on the P-cluster pair from CO inhibition, and also to take part in mediating a P-cluster-to-Mo-site H+-relay system (involving two hydrogen-bonded H2O) specifically required for N. reduction. The nonreducibility of CO at the [Mo-3Fe]-site is also explained. Experimental support for molecular-sieve effects of M-cluster cage has been obtained from the observed decrease in ethene-cis-d: selectivity by competitive inhibition of HC—CH reduction in D2O by N—N.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01165769
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  • 4
    Electronic Resource
    Electronic Resource
    LR spectroscopic study of chemisorbed dinitrogen species on ammonia synthesis iron catalysts (1989)
    Springer
    Catalysis letters 3 (1989), S. 129-141 
    Details
    ISSN: 1572-879X
    Keywords: Ammonia synthesis iron catalysts ; Raman spectroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The results of the LRS study of N-containing chemisorbed species on the promoted iron catalyst for ammonia synthesis have further substantiated the existence of two species of N2(a) as the dominant N-containing chemisorbed species under the functioning catalyst conditions. A model of active site, as 3-Fe cluster on (111) or (211) surface of α-Fe, and two modes of multinuclear coordination activation for the observed two species of N2(a) were proposed. It was further illustrated from reaction energetics that the mechanism of the dominant reaction pathway for ammonia synthesis/decomposition may be associative, rather than dissociative.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00763723
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  • 5
    Electronic Resource
    Electronic Resource
    Oxidative coupling of methane over BaF2-TiO2 catalysts (1993)
    Springer
    Catalysis letters 20 (1993), S. 179-183 
    Details
    ISSN: 1572-879X
    Keywords: Methane oxidative coupling ; barium-titanium oxides ; oxyfluorides
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The addition of F− to Ba-Ti mixed oxide catalysts significantly improves the catalytic performances for the oxidative coupling of methane (MOC), which can achieve high C2 yields at wide feed composition range and high GHSV. The effect is particularly marked for the BaF2− TiO2 catalysts containing more than 50 mol% BaF2. The C2 yield of 17% and the C2 selectivity of 〉 60% were achieved over these catalysts at 700 ° C. After being on stream for 31 h, the ≥ 50 mol% BaF2-TiO2 catalysts showed only a 1–1.5% decrease in the C2 yields. Results obtained by XRD show that various Ba-Ti oxyfluoride phases were formed due to the substitution of F− to O2−.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00769290
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  • 6
    Electronic Resource
    Electronic Resource
    Electron spectroscopic study of adsorption of methane on titanium dioxide surfaces (1992)
    Springer
    Catalysis letters 12 (1992), S. 319-325 
    Details
    ISSN: 1572-879X
    Keywords: Chemisorption of methane ; titanium dioxide ; oxygen vacancy ; photoelectron spectroscopy ; adcarbon species ; adoxygen species
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The chemisorption of methane has been investigated on titanium surface, the polycrystalline TiO2 film surface and the TiO2(100) surface with and without defects (oxygen vacancies). It has been found that the activation of C-H bonds depends on surface oxygen species. The different adsorption behavior between methane adsorption and methane-oxygen coadsorption, together with the different adsorption results on the TiO2(100) surface with and without defects, shows that the electrophilic oxygen species on the surface are active species for the activation of C-H bonds of methane. The temperature dependence of adlayer provides possible evidence for electrophilic oxygen species reacting with CHx on the surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00767214
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  • 7
    Electronic Resource
    Electronic Resource
    The oxidative coupling of methane and the activation of molecular O2 on CeO2/BaF2 (1994)
    Springer
    Catalysis letters 29 (1994), S. 177-188 
    Details
    ISSN: 1572-879X
    Keywords: OCM ; metal oxide-fluoride ; electron-enriched lattice oxygen ; quasi-free electrons
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract CeO2/BaF2 was used as the catalyst for the oxidative coupling of methane (OCM). At 800°C and CH4∶O2=2.7∶1,CH4 conversion of 34% with C2 hydrocarbon selectivity of 54.3% was obtained. XRD measurement showed that partial anion (O2−,F−) and/or cation (Ce4+,Ba2+) exchange between CeO2 and BaF2 lattices occurred. ESR study showed that O− species existed on degassed catalyst. XPS study revealed that, when BaF2 was added to CeO2, the binding energy of Be 3d5/2 was 2.2 eV lower than that in CeO2, and the “electron-enriched lattice oxygen” species was detected. XPS, ESR and Raman study showed that, under O2 adsorbing conditions, O 2 2− and O − 2 species were detected on CeO2/BaF2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00814264
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