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Journal of Applied Sciences
Year: 2005  |  Volume: 5  |  Issue: 7  |  Page No.: 1275 - 1278

Measurement of Surface Acidity of Amorphous Silica-Alumina Catalyst by Amine Titration Method

B.C. Roy, M.S. Rahman and M.A. Rahman    

Abstract: Amorphous silica-alumina catalyst samples of different Si:Al ratio as of 90:10, 70:30 and 50:50 were prepared from sodium metasilicate and aluminum sulphate by co-precipitation and gelation methods without pore regulating agent. Surface acidity of these catalyst samples were determined by Tamele method (amine titration method) using n-hexane and n-heptane as solvent instead of benzene used in Tamele method that having a carcinogenic effect and using n-butylamine solution as adsorbate. The effects of concentration of adsorbate, amount of catalyst sample and types of catalyst sample on the surface acidity were studied. Investigation of reproducibility measurement indicated that by selecting a moderate amount of sample and concentration of n-butylamine solution as minimum as possible surface acidity of the silica-alumina catalyst sample could be estimated with a fair degree of confidence. The total surface acidity of all the catalyst samples was greater in n-hexane than that of in n-heptane used as solvent. This result reveals that n-hexane or n-heptane can be used for the measurement of surface acidity of catalyst sample, as solvent instead of benzene in Tamele method but n-hexane is better.

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