Acid catalytic properties of reduced tungsten and niobium-tungsten oxides

C. Yue, X. Zhu, M.S. Rigutto, E.J.M. Hensen

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Abstract

Tungsten oxide and mixed niobium–tungsten oxides were prepared by calcination of re-precipitated tungsten and niobium precursors. These materials were characterized by N2 physisorption, XRD, XPS, UV–vis and UV Raman spectroscopy and H2-TPR. With increasing calcination temperature the oxides were seen to transform from a mixture of h-WO3 and HATB (T <400 °C) to predominantly h-WO3 (400 °C <T <470 °C) and m-WO3 (T > 470 °C). Ammonium ion and ammonia are essential to retain the hexagonal structure of the intermediate phase. The reducibility of the various samples was linked to their structure. In-situ XRD point to formation of ß-W in the presence of Pd when the precursor was deeply reduced. When the precursor predominantly contained h-WO3, (NH4)0.33-x(H3O)yWO3-z was obtained upon reduction of tungsten and mixed niobium–tungsten oxide materials. These exhibited good performance in the bifunctional hydroisomerization of n-alkanes, outperforming amorphous silica–alumina and tungstated zirconia catalysts.
Original languageEnglish
Pages (from-to)370-381
Number of pages10
JournalApplied Catalysis. B, Environmental
Volume163
DOIs
Publication statusPublished - 2015

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