Skip to main content
U.S. Department of Energy
Office of Scientific and Technical Information

Characterization of SiO/sub 2/-supported Mo(VI): the effect of calcination and exposure to water vapor

Journal Article · · J. Phys. Chem.; (United States)
DOI:https://doi.org/10.1021/j100411a006· OSTI ID:5037214
Surface structural speciation of SiO/sub 2/-supported Mo(VI) as a function of Mo impregnation technique, Mo loading, and hydration-calcination cycles is investigated by electron spectroscopy for chemical analysis (ESCA), ion scattering spectrometry (ISS), and laser Raman spectroscopy. More Mo is surface segregated by use of aqueous impregnation techniques than by use of allyl fixation. In both cases, the surface species, which are dependent upon Mo loading, include crystalline MoO/sub 3/, highly dispersed surface molybdate, and silicomolybdic acid. The symmetry within the silicomolybdic acid is destroyed by 500/sup 0/C O/sub 2/ calcination and is subsequently restored by rehydration. Consequences of the presence of such surface species with respect to the photocatalytic conversion of propane are discussed.
Research Organization:
Pittsburgh Energy Technology Center, PA
OSTI ID:
5037214
Journal Information:
J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 90:20; ISSN JPCHA
Country of Publication:
United States
Language:
English