Structure and Reactivity of Platinum−Copper Alloy Particles Supported on ZSM-5
| Autor: | Wolfgang Grünert, Efim S. Shpiro, Günter Schulz-Ekloff, Olga P. Tkachenko, Nils I. Jaeger |
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| Rok vydání: | 1998 |
| Předmět: |
Materials science
Alloy chemistry.chemical_element engineering.material Copper Surfaces Coatings and Films chemistry.chemical_compound chemistry X-ray photoelectron spectroscopy Materials Chemistry engineering Electronic effect Physical chemistry Physical and Theoretical Chemistry Fourier transform infrared spectroscopy ZSM-5 Platinum Carbon monoxide |
| Zdroj: | The Journal of Physical Chemistry B. 102:3798-3805 |
| ISSN: | 1520-5207 1520-6106 |
| DOI: | 10.1021/jp981029g |
| Popis: | Electronic and structural properties of highly dispersed Pt−Cu alloys supported on zeolite HZSM-5 with narrow particle size distribution (1−2 nm) were studied by transmission electron microscopy, X-ray photoelectron spectroscopy, and Fourier transform infrared spectroscopy of chemisorbed carbon monoxide. FTIR of adsorbed CO proved to be the most sensitive tool for the detection of alloy formation. Dilution of the platinum surface with copper can be recognized by the absence of dipole−dipole interaction between the chemisorbed CO molecules (geometric effect). A strong red shift of the vibration frequency of linearly bonded CO in conjunction with an increase of the relative intensity of bridge-bonded CO is discussed in terms of an electronic effect. All spectroscopic methods demonstrate the ready reoxidation and redispersion of the copper component of the particles and the reversible formation of the alloy again by repeated reduction. |
| Databáze: | OpenAIRE |
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