A comparative study of the surface structure, acidity, and catalytic performance of tungstated zirconia prepared from crystalline zirconia or amorphous zirconium oxyhydroxide

Article Abstract:

The influence of W surface density and the nature of the support on the surface structure, development of the acidity and catalytic performance of W[O.sub.x]/ZrO2catalysts is examined and two series of catalysts containing W are prepared by pore volume impregnation of two different supports. No significant effect of the initial form of the support (Zr oxyhydroxide versus predominantly tetragonal Zr) is found on the development of the surface structure and catalytic properties.

All Other Basic Inorganic Chemical Manufacturing, Industrial inorganic chemicals, not elsewhere classified, Tungsten Compounds, Amorphous substances, Amorphous materials

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Relations between structure, acidity, and activity of [WO.sub.x]/TiO2: Influence of the initial state of the support, titanium oxyhydroxide, or titanium oxide

Article Abstract:

The influence of W deposition and the crystalline nature of the support on the surface structure, acidity, and catalytic activity are investigated by x-ray diffraction (XRD), Raman, and infrared spectroscopy and catalytic tests. Two series of [WO.sub.x]/TiO2 catalysts containing up to 4.4 atoms of W/[nm.sup.2] are prepared by the pore volume impregnation of titanium oxyhydroxide dried at 393 K or titanium oxide calcined at 773 K.

Usage, X-rays, X-ray diffraction, Titanium dioxide, Infrared spectroscopy

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Correlations between acidity, surface structure, and catalytic activity of niobium oxide supported on zirconia

Article Abstract:

The development of the acidity and the relationship between acidity, catalytic activity, and the surface structure for niobium oxide supported on zirconia is investigated for a series of solids. The catalysts were active for 2-propanol dehydration only above a threshold in Nb loading.

France, Primary nonferrous metals, not elsewhere classified, Primary Smelting and Refining of Nonferrous Metal (except Copper and Aluminum), Columbium, Properties, Structure, Niobium

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