TY - JOUR
T1 - Structural and textural characterization of sol-gel prepared nanoscale titanium-chromium mixed oxides
AU - Khaleel, Abbas
AU - Shehadi, Ihsan
AU - Al-Shamisi, Mariam
N1 - Funding Information:
The financial support of the UAE University Research Council , contract number 06-03-2-11/07 , is acknowledged with gratitude. The authors thank Mr. Saeed Tariq, Faculty of Medicine and Health Sciences, UAE University, for the TEM micrographs.
PY - 2010/6/1
Y1 - 2010/6/1
N2 - Chromium-titanium mixed oxides with Cr/Ti+Cr molar ratio of 0.1, 0.2, 0.5, and 0.9 were prepared by a direct sol-gel method. The products were characterized by powder XRD, FT-IR spectroscopy, TEM, and N2 adsorption. Starting with 10% Cr3+, Cr/Ti+Cr=0.1, resulted in a complete dispersion of the Cr3+ ions in the titania matrix. On the other hand, a ratio of 0.2 resulted in the formation of traces of segregated α-Cr2O3, besides Cr-doped titania. At higher Cr contents, %Cr of ≥50, crystalline Ti-doped Cr2O3 and an amorphous Crdoped titania were obtained. Compared with the corresponding one-metal oxides, TiO2 and α-Cr2O3, the mixed oxides showed significantly modified textural properties presented in higher surface areas, larger porosities, and more homogeneous mesoporous structures. In addition, the incorporation of Cr3+ ions in the titania lattice enhanced the thermal stability of the anatase phase against transformation to rutile.
AB - Chromium-titanium mixed oxides with Cr/Ti+Cr molar ratio of 0.1, 0.2, 0.5, and 0.9 were prepared by a direct sol-gel method. The products were characterized by powder XRD, FT-IR spectroscopy, TEM, and N2 adsorption. Starting with 10% Cr3+, Cr/Ti+Cr=0.1, resulted in a complete dispersion of the Cr3+ ions in the titania matrix. On the other hand, a ratio of 0.2 resulted in the formation of traces of segregated α-Cr2O3, besides Cr-doped titania. At higher Cr contents, %Cr of ≥50, crystalline Ti-doped Cr2O3 and an amorphous Crdoped titania were obtained. Compared with the corresponding one-metal oxides, TiO2 and α-Cr2O3, the mixed oxides showed significantly modified textural properties presented in higher surface areas, larger porosities, and more homogeneous mesoporous structures. In addition, the incorporation of Cr3+ ions in the titania lattice enhanced the thermal stability of the anatase phase against transformation to rutile.
KW - Doped titania
KW - Mixed oxides
KW - Nanoparticles
KW - Sol-gel
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U2 - 10.1016/j.jnoncrysol.2010.04.031
DO - 10.1016/j.jnoncrysol.2010.04.031
M3 - Article
AN - SCOPUS:77956395227
SN - 0022-3093
VL - 356
SP - 1282
EP - 1287
JO - Journal of Non-Crystalline Solids
JF - Journal of Non-Crystalline Solids
IS - 25-27
ER -