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  • 1
    Electronic Resource
    Electronic Resource
    An effective heterogeneous WO3/TiO2–SiO2 catalyst for selective oxidation of cyclopentene to glutaraldehyde by H2O2 (1999)
    Springer
    Catalysis letters 62 (1999), S. 201-207 
    Details
    ISSN: 1572-879X
    Keywords: catalytic oxidation ; cyclopentene ; H2O2 ; glutaraldehyde (GA) ; TiO2–SiO2 xerogel ; WO3/TiO2–SiO2 catalyst
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract TiO2–SiO2 mixed oxide with large pore size was synthesized by the xerogel method and it was then used to prepare the WO3/TiO2–SiO2 catalyst by an incipient wetness method. The as‐prepared WO3/TiO2–SiO2 sample was employed as the first heterogeneous catalyst in the liquid‐phase cyclopentene oxidation by aqueous H2O2, which exhibited higher selectivity (about 75%) to glutaraldehyde (GA) and, in turn, higher GA yield than the WO3/SiO2 heterogeneous catalyst and even the tungstic acid homogeneous catalyst under the same reaction conditions. The amorphous WO3 phase was identified as the active sites and the loss of the active sites was proved to be not important. The lifetime of the catalyst was determined and its regeneration method was proposed. The effects of various factors on the catalytic behaviors, such as the WO3 loading, the calcination temperature, the surface acidity and the reaction media, were investigated and discussed based on various characterizations including BET, XRD, XPS, FTIR, EXAFS and Raman spectra etc.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019094905328
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  • 2
    Electronic Resource
    Electronic Resource
    Belousov-Zhabotinskii type oscillations with amino acids or peptides as organic substrates in the presence of Mn2+ and Fe(phen)32+ as coupled catalysts (1998)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 30 (1998), S. 243-247 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Nine amino acids, aspartic acid, glycine, serine, tyrosine, alanine, glutamic acid, threonine, cystine, phenylalanine, and two peptides, and two peptides, glycine-glycine peptide, glutamic acid-cystine-glycine peptide, give rise to damped oscillations of the Belousov-Zhabotinskii(BZ) type in a batch reactor. Both Mn2+ and Fe(phen)32 are essential for most of those oscillations; and the oscillations in [Mn3+] and [Fe(phen)33+] are also observed. The role of two metallic ions played in the oscillations are analyzed, showing that Mn2+ catalyzes the oxidation of the amino acids or peptides by BrO3- to produce some intermediates which effectively reduce Br2 to Br- catalyzed by Fe(phen)32+. © 1998 John Wiley & Sons, Inc. Int. J. Chem Kinet 30: 243-247, 1998.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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