skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Transmission electron microscopy and energy-dispersive X-ray spectroscopy study of V{sub 2}O{sub 5}/TiO{sub 2}-ZrO{sub 2} catalyst

Abstract

Transmission electron microscopy (TEM) and energy-dispersive X-ray (EDX) spectroscopy techniques were used to investigate the structure of a TiO{sub 2}-ZrO{sub 2} binary oxide support and a V{sub 2}O{sub 5}/TiO{sub 2}-ZrO{sub 2} catalyst. The TiO{sub 2}-ZrO{sub 2} (1:1 mole ratio) was obtained by a homogeneous coprecipitation method, and the 12 wt% V{sub 2}O{sub 5}/TiO{sub 2}-ZrO{sub 2} catalyst was prepared by a wet impregnation method. Both samples were subjected to thermal treatments from 773 to 1,073 K in order to understand the temperature stability of these materials. The TiO{sub 2}-ZrO{sub 2} support was in an amorphous state when calcined at 773 K. However, the formation of the ZrTiO{sub 4} compound was noted at higher calcination temperatures characterized by a layer structure with a lattice spacing of ca. 2.87 {angstrom} due to the (111) plane of this compound. The V{sub 2}O{sub 5}/TiO{sub 2}-ZrO{sub 2} catalyst when calcined at 773 K shows heterogeneity in the distribution of vanadium oxide species on the support surface. The TEM/EDX analysis further provides clear evidence for ZrV{sub 2}O{sub 7} and TiO{sub 2} formation at 1,073 K calcination in agreement with X-ray diffraction observations.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Centro de Investigaciones Cientificas, Sevilla (ES)
OSTI Identifier:
20075540
Resource Type:
Journal Article
Journal Name:
Langmuir
Additional Journal Information:
Journal Volume: 16; Journal Issue: 9; Other Information: PBD: 2 May 2000; Journal ID: ISSN 0743-7463
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; HETEROGENEOUS CATALYSIS; VANADIUM OXIDES; TITANIUM OXIDES; ZIRCONIUM OXIDES; MOLECULAR STRUCTURE

Citation Formats

Reddy, E.P., Rojas, T.C., Fernandez, A., Chowdhury, B., and Reddy, B.M. Transmission electron microscopy and energy-dispersive X-ray spectroscopy study of V{sub 2}O{sub 5}/TiO{sub 2}-ZrO{sub 2} catalyst. United States: N. p., 2000. Web. doi:10.1021/la9912545.
Reddy, E.P., Rojas, T.C., Fernandez, A., Chowdhury, B., & Reddy, B.M. Transmission electron microscopy and energy-dispersive X-ray spectroscopy study of V{sub 2}O{sub 5}/TiO{sub 2}-ZrO{sub 2} catalyst. United States. doi:10.1021/la9912545.
Reddy, E.P., Rojas, T.C., Fernandez, A., Chowdhury, B., and Reddy, B.M. Tue . "Transmission electron microscopy and energy-dispersive X-ray spectroscopy study of V{sub 2}O{sub 5}/TiO{sub 2}-ZrO{sub 2} catalyst". United States. doi:10.1021/la9912545.
@article{osti_20075540,
title = {Transmission electron microscopy and energy-dispersive X-ray spectroscopy study of V{sub 2}O{sub 5}/TiO{sub 2}-ZrO{sub 2} catalyst},
author = {Reddy, E.P. and Rojas, T.C. and Fernandez, A. and Chowdhury, B. and Reddy, B.M.},
abstractNote = {Transmission electron microscopy (TEM) and energy-dispersive X-ray (EDX) spectroscopy techniques were used to investigate the structure of a TiO{sub 2}-ZrO{sub 2} binary oxide support and a V{sub 2}O{sub 5}/TiO{sub 2}-ZrO{sub 2} catalyst. The TiO{sub 2}-ZrO{sub 2} (1:1 mole ratio) was obtained by a homogeneous coprecipitation method, and the 12 wt% V{sub 2}O{sub 5}/TiO{sub 2}-ZrO{sub 2} catalyst was prepared by a wet impregnation method. Both samples were subjected to thermal treatments from 773 to 1,073 K in order to understand the temperature stability of these materials. The TiO{sub 2}-ZrO{sub 2} support was in an amorphous state when calcined at 773 K. However, the formation of the ZrTiO{sub 4} compound was noted at higher calcination temperatures characterized by a layer structure with a lattice spacing of ca. 2.87 {angstrom} due to the (111) plane of this compound. The V{sub 2}O{sub 5}/TiO{sub 2}-ZrO{sub 2} catalyst when calcined at 773 K shows heterogeneity in the distribution of vanadium oxide species on the support surface. The TEM/EDX analysis further provides clear evidence for ZrV{sub 2}O{sub 7} and TiO{sub 2} formation at 1,073 K calcination in agreement with X-ray diffraction observations.},
doi = {10.1021/la9912545},
journal = {Langmuir},
issn = {0743-7463},
number = 9,
volume = 16,
place = {United States},
year = {2000},
month = {5}
}