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  • 1
    ISSN: 0268-2575
    Keywords: Hydrocracking ; bifunctional catalyst ; hydrogenation/cracking activity ; hydroisomerization ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Hydroconversion of n-heptane and toluene has been studied over a commercially proven Ni-W/SiO2-Al2O3 amorphous base hydrocracking catalyst (suitable for maximizing middle distillates production from heavier feedstocks) under a wide range of operating conditions (pressure: 400-1200 psig; temperature: 315-360°C, liquid hourly space velocity (LHSV) ≃ 1 h-1 and molar hydrogen/hydrocarbon feed ratio: 6-8) to assess the hydrogenation and cracking activities of the catalyst screening. Hydroisomerization followed by hydrocracking, ad hydrogenation followed by isomerization have been found to be the major reaction with n-heptane and toluene respectively as the feeds. The hydroconversion of toluene gives a very high selectivity of hydrogenated product. With n-heptane, a very high selectivity of hydroisomerized product, together with a high ratio of hydroisomerized to hydrocracked product, is obtained.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: LCAO MO Calculations on Donor-Acceptor Complexes. II. Formation of Donor-Acceptor Complexes of Cyclic Anhydrides with Lewis AcidsComplex formation between succinic or maleic anhydride with SbCl5, AlCl3, AlBr3 has been investigated by means of IR and PMR spectroscopy. In molar ratios of donor to acceptor 1:1 and 1:2 complex formation is uncomplete. A cleavage of anhydride bond system is not observed. Only one oxygen atom of anhydride is complexed with Lewis acid. From CNDO/2 calculation it is suggested that an unsymmetrical complex structure is most stable.
    Notes: Die Komplexbildung zwischen Bernsteinsäure- sowie Maleinsäureanhydrid mit SbCl5, AlCl3 und AlBr3 wird IR- und 1H-NMR-spektroskopisch untersucht. Für molare Donator-Akzeptor-Mischungen von 1:1 und 1:2 bleibt die Komplexbildung unvollständig. Eine Spaltung des Anhydrid-Bindungssystems wird nicht beobachtet. Nur ein Sauerstoffatom des Anhydridmoleküls wird von der Lewissäure koordiniert. Nach CNDO/2 Berechnungen ist eine unsymmetrische Komplexstruktur am stabilsten.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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