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Title: Synthesis and characterization of TiO{sub 2}--MgO mixed oxides prepared by the sol-gel method

Abstract

Titania-magnesia mixed oxides, with magnesia concentrations between 10 and 90 wt%, were prepared by using to sol-gel method with titanium n-butoxide and magnesium ethoxide as precursors. The mixed oxides were characterized with X-ray powder diffraction, BET nitrogen adsorption isotherms, electron spin resonance (ESR), and by testing their catalytic activity for 2-propanol and 2-butanol dehydration. Samples contained periclase, anatase, karooite (MgTi{sub 2}O{sub 5}), geikielite (MgTiO{sub 3}), and qandilite (Mg{sub 2}TiO{sub 4}). The BET specific surface area varied with magnesia concentration; the samples with 50 wt% MgO had the highest area, 211 m{sup 2}/g. Samples had paramagnetic centers that produced complex ESR spectra when many crystalline phases coexisted. For 2-propanol and 2-butanol decomposition, the activity and selectivity patterns of the mixed oxides were substantially different to those observed in pure TiO{sub 2} and pure MgO. This singular behavior should be a result of the structural defects created by the substitution of Mg{sup 2+} ions by Ti{sup 4+} cations in titania lattice, as well as by the interfaces created when several crystalline phases coexisted.

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Univ. Autonoma Metropolitana-Iztapalapa (MX)
OSTI Identifier:
20000513
Report Number(s):
CONF-9808111-
Journal ID: ISSN 0743-7463; LANGD5
Resource Type:
Journal Article
Journal Name:
Langmuir
Additional Journal Information:
Journal Volume: 15; Journal Issue: 18; Conference: Third international symposium on effects of surface heterogeneity in adsorption and catalysis on solids, Torun (PL), 08/09/1998--08/16/1998; Other Information: PBD: 31 Aug 1999; Journal ID: ISSN 0743-7463
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 10 SYNTHETIC FUELS; TITANIUM OXIDES; MAGNESIUM OXIDES; SOL-GEL PROCESS; SURFACE AREA; CRYSTAL STRUCTURE; CATALYTIC EFFECTS; PROPANOLS; BUTANOLS; DEHYDRATION; PARAMAGNETISM

Citation Formats

Lopez, T., Hernandez, J., Gomez, R., Bokhimi, X., Boldu, J.L., Munoz, E., Novaro, O., and Garcia-Ruiz, A. Synthesis and characterization of TiO{sub 2}--MgO mixed oxides prepared by the sol-gel method. United States: N. p., 1999. Web. doi:10.1021/la9812931.
Lopez, T., Hernandez, J., Gomez, R., Bokhimi, X., Boldu, J.L., Munoz, E., Novaro, O., & Garcia-Ruiz, A. Synthesis and characterization of TiO{sub 2}--MgO mixed oxides prepared by the sol-gel method. United States. doi:10.1021/la9812931.
Lopez, T., Hernandez, J., Gomez, R., Bokhimi, X., Boldu, J.L., Munoz, E., Novaro, O., and Garcia-Ruiz, A. Tue . "Synthesis and characterization of TiO{sub 2}--MgO mixed oxides prepared by the sol-gel method". United States. doi:10.1021/la9812931.
@article{osti_20000513,
title = {Synthesis and characterization of TiO{sub 2}--MgO mixed oxides prepared by the sol-gel method},
author = {Lopez, T. and Hernandez, J. and Gomez, R. and Bokhimi, X. and Boldu, J.L. and Munoz, E. and Novaro, O. and Garcia-Ruiz, A.},
abstractNote = {Titania-magnesia mixed oxides, with magnesia concentrations between 10 and 90 wt%, were prepared by using to sol-gel method with titanium n-butoxide and magnesium ethoxide as precursors. The mixed oxides were characterized with X-ray powder diffraction, BET nitrogen adsorption isotherms, electron spin resonance (ESR), and by testing their catalytic activity for 2-propanol and 2-butanol dehydration. Samples contained periclase, anatase, karooite (MgTi{sub 2}O{sub 5}), geikielite (MgTiO{sub 3}), and qandilite (Mg{sub 2}TiO{sub 4}). The BET specific surface area varied with magnesia concentration; the samples with 50 wt% MgO had the highest area, 211 m{sup 2}/g. Samples had paramagnetic centers that produced complex ESR spectra when many crystalline phases coexisted. For 2-propanol and 2-butanol decomposition, the activity and selectivity patterns of the mixed oxides were substantially different to those observed in pure TiO{sub 2} and pure MgO. This singular behavior should be a result of the structural defects created by the substitution of Mg{sup 2+} ions by Ti{sup 4+} cations in titania lattice, as well as by the interfaces created when several crystalline phases coexisted.},
doi = {10.1021/la9812931},
journal = {Langmuir},
issn = {0743-7463},
number = 18,
volume = 15,
place = {United States},
year = {1999},
month = {8}
}