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Preparation and characterization of high surface area alumina-titania solid acids

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Abstract

As part of a systematic study of solid acids, a series of high surface area single-phase alumina-titania mixed oxides were prepared. These materials were found to have higher surface areas, greater porosity and enhanced specific surface acidity than comparable alumina-titania solid acids reported in the literature. The thermal stability of the phases and their textural and physicochemical properties have been studied over a range of Al/Ti compositions and for calcinations up to 1000°C. The samples were characterized by differential thermal analysis-thermogravimetry, X-ray diffraction, nitrogen physisorption and X-ray photoelectron spectroscopy. Surface acidity was measured by temperature programmed desorption and in situ Fourier transform-infrared spectroscopy, using ammonia as a probe molecule. The strength and density of the acid sites were proportional to the Ti-content.

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Authors and Affiliations

  1. Centre for Catalytic Systems and Materials Engineering, Department of Engineering, University of Warwick, Coventry, CV4 7AL, UK

    G. S WALKER, E WILLIAMS & A. K BHATTACHARYA

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  1. G. S WALKER
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  2. E WILLIAMS
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  3. A. K BHATTACHARYA
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WALKER, G.S., WILLIAMS, E. & BHATTACHARYA, A.K. Preparation and characterization of high surface area alumina-titania solid acids. Journal of Materials Science 32, 5583–5592 (1997). https://doi.org/10.1023/A:1018628608830

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