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Characterization of Tungsten Oxide Supported on TiO2 and Activity for Acid Catalysis
Department of Industrial Chemistry, Kyungpook National University, Engineering College, Taegu 702-701, Korea
jrsohn@knu.ac.kr
Korean Journal of Chemical Engineering, January 2000, 17(1), 86-92(7), 10.1007/BF02789259
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Abstract
Tungsten oxide-titania catalysts were prepared by drying powdered Ti(OH)4 with ammonium metatungstate aqueous solution, followed by calcining in air at high temperature. Characterization of prepared catalysts was performed by using FTIR, Raman, XPS, XRD and DSC and by measuring surface area. Upon the addition of tungsten oxide to titania up to 20wt%, the specific surface area and acidity of catalysts increased in proportion to the tungsten oxide content due to the interaction between tungsten oxide titania. Since the TiO2 stabilizes the tungsten oxide species, for the samples equal to or less than 20wt%, tungsten oxide was well dispersed on the surface of titania, but for samples containing 25wt% or above 25%, the triclinic phase of WO3 was observed at calcination temperature above 400℃. The catalytic actibities for 2-propanol dehydration and cumene dealkylation were correlated with the acidity of catalysts measured by ammonia chemisorption method.
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References
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