NDLI: Dispersion state and catalytic properties of vanadia species on the surface of V$_{2}$O$_{5}$/TiO$

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Dispersion state and catalytic properties of vanadia species on the surface of V$_{2}$O$_{5}$/TiO$_{2}$ catalysts

Content Provider	Springer Nature Link
Author	Xu, Bolian Fan, Yining Liu, Liu Lin, Ming Chen, Yi
Copyright Year	2002
Abstract	The dispersion state and catalytic properties of anatase-supported vanadia species are studied by means of X-ray diffraction (XRD), laser Raman spectroscopy (LRS), H$_{2}$ temperature-programmed reduction (TPR) and the selective oxidation of o-xylene to phthalic anhydride. The almost identical values of the experimental dispersion capacity of V$_{2}$O$_{5}$ on anatase and the surface vacant sites available on the preferentially exposed (001) plane of anatase suggest that the highly dispersed vanadium cations are bonded to the vacant sites on the surface of anatase as derived by the incorporation model. When the loading amount of V$_{2}$O$_{5}$ is far below its dispersion capacity, the dispersed vanadia species might mainly consist of isolated VO$_{x}$ species bridging to the surface through V-O-Ti bonds. With the increase of V$_{2}$O$_{5}$ loading the isolated vanadia species interact with their nearest neighbors (either isolated or polymerized vanadia) through bridging V-O-V at the expenses of V-O-Ti bonds, resulting in the increase of the ratio of polymerized to isolated vanadia species and the decrease of the reactivity of the associated surface oxygen anions and, consequently, although the activity increases with loading to reach a maximum value, the turn over number (TON) of the V$_{2}$O$_{5}$/TiO$_{2}$ catalyst decreases linearly. When the loading amount of V$_{2}$O$_{5}$ is higher than its dispersion capacity, the turn over number decreases more rapidly with the increase of V$_{2}$O$_{5}$ loading due to the formation of V$_{2}$O$_{5}$ crystallites in which the oxygen anions associated with V-O-V bonds are less reactive and only partially exposed on the surface.
Starting Page	407
Ending Page	415
Page Count	9
File Format	PDF
ISSN	10069291
Journal	Science in China Series B: Chemistry
Volume Number	45
Issue Number	4
e-ISSN	18622771
Language	English
Publisher	Science in China Press
Publisher Date	2002-01-01
Publisher Place	Beijing
Access Restriction	Subscribed
Subject Keyword	vanadium pentaoxide titanium oxide dispersion capacity selective oxidation Chemistry/Food Science
Content Type	Text
Resource Type	Article
Subject	Chemistry

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