Copper precursor effect on reducibility and titania phases concentration of sol-gel Cu/TiO{sub 2} catalyst

Journal Article · Sat May 01 04:00:00 EDT 1999 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1006/jssc.1999.8164· OSTI ID:351514

Bokhimi, X; Novaro, O ^[1]; Gonzalez, R D ^[2]; Lopez, T; Chimal, O; Asomoza, A; Gomez, R ^[3]

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1. National Univ. of Mexico, Distrito Federal (Mexico). Inst. of Physics
2. Tulane Univ., New Orleans, LA (United States). Dept. of Chemical Engineering
3. Univ. Autonoma Metropolitana-I, Distrito Federal (Mexico). Dept. of Chemistry

Cu/TiO{sub 2} catalyst was synthesized by cogelling CuSO{sub 4}, or CuCl{sub 2}, with titanium ethoxide. Samples were nanocrystalline with titania phase concentration that depended on copper precursor and sample annealing temperature. Phase quantitative analysis was performed by refining crystalline structure. The fresh samples prepared with CuSO{sub 4} contained almost amorphous rutile with an average crystallite size of 1.4(1)nm. Average crystallite sizes correlated well to BET areas, which were large for fresh samples and for those calcined at 400 C, and only a few square meters per gram of those calcined at 800 C. Hydrogen consumption of the samples prepared with CuSO{sub 4} was 20 times larger than in those prepared with CuCl{sub 2}. Reduction temperature and hydrogen consumption, which are determined by copper-titania interaction, can be explained in terms of the main defects found in nanocrystalline titania phases: titanium vacancies and hydroxyls in their crystalline structure.

• Sponsoring Organization: Consejo Nacional de Ciencia y Tecnologia (CONACYT), Mexico City (Mexico); National Science Foundation, Washington, DC (United States)
• OSTI ID: 351514
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 2 Vol. 144; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
54 ENVIRONMENTAL SCIENCES
CATALYSTS
COMPOSITE MATERIALS
COPPER
DECOMPOSITION
EXPERIMENTAL DATA
NITROGEN OXIDES
PHASE STUDIES
REDOX REACTIONS
TITANIUM OXIDES
X-RAY DIFFRACTION