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Laser Raman spectroscopy of supported vanadium oxide catalysts

Journal Article · · Journal of Physical Chemistry; (USA)
DOI:https://doi.org/10.1021/j100373a067· OSTI ID:6518219
; ;  [1]
  1. Lawrence Berkeley Lab., CA (USA)
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Supported vanadia catalysts were studied by Raman spectroscopy to establish the effects of vanadia loading and support composition on the structure of the dispersed vanadia species. Three types of vanadia species were found to be present on SiO{sub 2}, TiO{sub 2}, and Al{sub 2}O{sub 3} supports: monomeric vanadyls, one- and two-dimensional vanadate chains, and crystallites of V{sub 2}O{sub 5}. Monomeric vanadyls are characterized by a narrow Raman band in the region of 1,026-1,042 cm{sup {minus}1}, the position being sensitive to the identity of the support. The terminal V{double bond}O groups of polyvanadate chains give rise to a broad feature in the region of 800-1,000 cm{sup {minus}1} which, in the case of TiO{sub 2}-supported V{sub 2}O{sub 5}, shifts to higher frequency as the V{sub 2}O{sub 5} loading increases. Crystalline V{sub 2}O{sub 5} was detected at higher loadings on all three supports. Evidence from Raman spectroscopy and O{sub 2} chemisorption indicates that the dispersion of vanadia increases in the order SiO{sub 2} < Al{sub 2}O{sub 3} {approximately} TiO{sub 2}.

DOE Contract Number:
AC03-76SF00098
OSTI ID:
6518219
Journal Information:
Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 94:10; ISSN 0022-3654; ISSN JPCHA
Country of Publication:
United States
Language:
English

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Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical &amp; Physicochemical Properties
CATALYSTS
CHALCOGENIDES
DATA
DATA ANALYSIS
EXPERIMENTAL DATA
INFORMATION
LASER SPECTROSCOPY
MEASURING INSTRUMENTS
MEASURING METHODS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
RAMAN SPECTROSCOPY
SPECTROSCOPY
TRANSITION ELEMENT COMPOUNDS
VANADIUM COMPOUNDS
VANADIUM OXIDES