Freeze-dried promoted and unpromoted sulfated zirconia and their catalytic potential
- 29 May 2001
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of Materials Chemistry
- Vol. 11 (7) , 1903-1911
- https://doi.org/10.1039/b009170g
Abstract
A new synthesis route for sulfated zirconia and iron, manganese, and iron–manganese promoted sulfated zirconia has been investigated. Zirconium hydroxide precursors were prepared from hydrogel and hydro-alcogel; freeze-drying as well as oven-drying has been employed. The pure hydroxides, sulfated, and metal promoted sulfated zirconia were calcined at 650 °C and characterised by chemical analysis, XRD, TG/DTG/DTA, nitrogen adsorption, SEM, FTIR pyridine adsorption, and ammonia TPD. The catalytic activity of the samples was screened in the double bond isomerisation of 1-butene and the benzoylation of anisole. Significant differences in the textural and acidic properties were found for samples prepared either by freeze- or oven-drying. Virtually no difference in acidity was observed between sulfated and metal promoted sulfated zirconia. Freeze-drying, especially the hydro-alcogel synthesis, was found to be a powerful preparation method for promoted and unpromoted sulfated zirconia catalysts.Keywords
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