Journal of the Chemical Society - Faraday Transactions p. 2907 - 2912 (1995)
Update date:2022-08-16
Topics:
Lahousse, Christophe
Mauge, Francoise
Bachelier, Jean
Lavalley, Jean-Claude
TiO2-Al2O3 mixed oxides have been prepared by cohydrolysis of Ti(4+) and Al(3+) isopropoxides.Textural and acid-base properties were investigated using nitrogen physisorption, adsorption of probe molecules followed by FTIR spectroscopy, and test-reactions.Catalysts were found to exhibit high surface areas and pore volumes.Results obtained from adsorbed CO2 probe molecules and COS hydrolysis activity agreed well and showed that the hydroxy basicity of mixed oxides was lower than that of the two oxide components.Pyridine and 2,6-dimethylpyridine were used to titrate Lewis and Broensted acidic sites, respectively.A linear increase of the number of strong Lewis acid sites with alumina content was observed, whereas the number of Broensted acid sites reached a maximum for 30percent TiO2-70percent Al2O3 compared with that expected from the composition and the activity of pure oxides.Comparison between probe-molecule adsorption and test reaction, points out that both types of site are involved in propan-2-ol dehydration.A transformation of Lewis acid sites into Broensted sites is proposed when propan-2-ol is chemisorbed on Lewis acid sites.
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