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  • 1
    Electronic Resource
    Electronic Resource
    Complex oscillations and global coupling during the catalytic oxidation of CO (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 104 (1996), S. 6375-6386 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Rate oscillations during heterogeneous catalytic reactions often display self-similar mixed-mode oscillations that have also been found in various other experimental systems. Spatially nonuniform behavior is revealed by monitoring the surface temperature during complex oscillations in the kinetic regime of the CO oxidation on a Pd supported catalyst at atmospheric pressure. The experimental results demonstrate the influence of global coupling via the gas phase concentration of the deficient component. In addition, the local autonomous frequency appears to be spatially nonuniform. A simple discrete model, a set of globally coupled relaxation oscillators with a frequency distribution, captures qualitatively the experimentally observed behavior. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.471299
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  • 2
    Electronic Resource
    Electronic Resource
    FTIR evidence of the formation of platinum carbonyls from Pt metal clusters encaged in KL zeolite (1995)
    Springer
    Catalysis letters 34 (1995), S. 293-303 
    Details
    ISSN: 1572-879X
    Keywords: platinum carbonyls ; KL zeolite supported Pt ; CO chemisorption on Pt ; IR spectroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Reactivity of Pt metal clusters supported on KL zeolite toward CO was studied by FTIR spectroscopy. Investigation of the CO adsorption was performed within a wide CO pressure range (1–500 mbar). IR data on the CO adsorption at high pressure (500 mbar) suggest the transformation of the finest Pt particles into neutral Pt carbonyls ((Zeol-O:) m Pt x (CO) y ) stabilized by the basic oxygen atoms of the KL framework. The transformation is found to be readily reversible upon CO adsorption-desorption at room temperature (RT).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00806878
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  • 3
    Electronic Resource
    Electronic Resource
    Electronic state and location of Pt metal clusters in KL zeolite: FTIR study of CO chemisorption (1995)
    Springer
    Catalysis letters 32 (1995), S. 147-158 
    Details
    ISSN: 1572-879X
    Keywords: Pt/KL zeolite ; CO chemisorption on Pt ; IR spectroscopy ; electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Electronic state and location of Pt metal clusters supported on KL zeolite are studied by FTIR spectroscopy of adsorbed CO. Investigation of the CO adsorption was performed within the wide CO pressure range (from 4×10−3 to 102 Pa) and supplemented by the study of the CO desorption at elevated temperature. Comparison of the data on CO adsorption and desorption at increased temperature reveals the existence of two groups of Pt particles in the sample. The first group of the particles is localized on the outer surface of the zeolite microcrystals and in the near surface region; they exhibit CO bands at 2060-2050 cm−1 close to those of Pt supported on conventional supports. The particles of the second group are encaged inside zeolite channels and their electronic structure is presumably strongly perturbed by the zeolite framework. CO adsorbed on the Pt particles of this group exhibits coverage dependent bands at frequencies in the range 1960-1920 cm−1. The marked downward shift of thevCO band is attributed to the increase of electron density on these particles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00806110
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    Paper (German National Licenses)
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