Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Characterization of the Pt-C bond of CO adsorbed by small Pt particles in a NaX zeolite by IR diffuse reflectance spectroscopy (1994)
    Springer
    Catalysis letters 23 (1994), S. 263-269 
    Details
    ISSN: 1572-879X
    Keywords: CO chemisorption on Pt ; carbon-Pt bond ; IR diffuse reflectance spectroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The unusual properties of small (1–2 nm) Pt particles within a zeolite support are documented by diffuse reflectance infrared spectroscopy of the metal-carbon bond of linearly adsorbed CO. The wave number of the metal-carbon stretching frequency is found to be about 60 cm−1 higher compared to larger particles (2–3 nm) or to the bulk metal. The stronger bond is attributed to a negative charge on the small metal particles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00811361
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 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
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 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
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    In situ FTIR and UV/VIS spectroscopic study of the generation of anionic Pt-carbonyl complexes within a faujasite matrix (1994)
    Springer
    Catalysis letters 30 (1994), S. 65-75 
    Details
    ISSN: 1572-879X
    Keywords: anionic Pt-carbonyl complexes ; CO chemisorption on Pt ; IR spectroscopy ; UV/VIS diffuse reflectance spectroscopy ; faujasites
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The temporal generation of anionic platinum-carbonyl complexes in platinum ionexchanged zeolites X and Y by reductive carbonylation at 105 Pa and 363 K is monitored by in situ UV/VIS and FTIR spectroscopy. A monomer [Pt3(CO)6]2−, exhibiting bands at 318 and 456 nm in the UV/VIS spectra and at 1790 and 2025 cm−1 in the FTIR spectra, is the only platinum/species formed in NaX. The monomer as well as oligomers are generated in NaY, where the formation of the latter species is due to the stronger acidity in the NaY as compared to NaX. The decomposition of the complexes results in the generation of Pt clusters of the size ≤1 nm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00813673
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...