Interaction of polycrystalline silver with oxygen, water, carbon dioxide, ethylene, and methanol: in situ Raman and catalytic studies
Article Abstract:
The interaction of polycrystalline silver with supra16(O2), supra18(O2), H2O, D2O, CO2, C2H4 and CH3OH at atmospheric pressure and temperatures between 25 and 500 degrees Celsius was examined using in situ Raman spectroscopy. Upon exposure to supra16(O2), two Raman bonds related to oxygen species were observed at 956 and 800 cm-1, which shifted to 931 and 778 cm-1 upon replacement of supra16(O2) with supra18(O2). The 956 cm-1 band is assigned to the stretching vibration of a surface atomic oxygen on top of a Ag atom with a Ag=O double bond, which does not appear to interact with H2O, ethylene and methanol. The 800 cm-1 Raman band, assigned to the stretching vibration of surface atomic oxygen sitting on the interstices of three Ag atoms with Ag-O-Ag bonds, readily interacts with water, ethylene and methanol.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1999
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Characterization and catalytic performances of three-dimensional mesoporous FeSBA-1 catalysts
Article Abstract:
Iron substituted cubic cage type mesoporous molecular sieves FeSBA-I were synthesized in a highly acidic media using cetyltriehtylammonium bromide as a template. Most of the iron atoms in FeSBA-I were found to be in # coordination state and the FeSBA-I catalyst showed superior catalytic performance for the tert-butylation of phenol as compared to the uni-dimensional mesoporous catalysts.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2006
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Comparison of UV and visible Raman spectroscopy of bulk metal molybdate and metal vanadate catalysts
Article Abstract:
The visible (532 and 442 nm) and UV (325nm) Raman spectra of metal molybdates and metal vanadates were compared to examine the variation in the excitation energy. It was revealed that the relative quality of the resulting Raman spectra strongly depends on the absorption properties of the bulk mixed oxide samples that possess low absorption.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2005
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