Catalysts in the WO 3 -ZrO 2 system were produced by coprecipitation of aqueous solutions of zirconium oxynitrate and ammonium metatungstate. Samples were characterized by X-ray powder diffraction, thermogravimetry, and refinement of their crystalline structures with the Rietveld method. This coprec
Surface characterization of WO3/ZrO2catalysts
β Scribed by Nithya Vaidyanathan; David M. Hercules; Marwan Houalla
- Publisher
- Springer
- Year
- 2002
- Tongue
- English
- Weight
- 124 KB
- Volume
- 373
- Category
- Article
- ISSN
- 1618-2650
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WO 3 /ZrO 2 catalysts were prepared by coprecipitation with 5, 10, 15, 19, and 25 wt.% WO 3 . These catalysts were characterized by XRD, BET, FTIR photoacoustic spectroscopy (pyridine adsorption), and NH 3 -TPD, and tested for the acetylation of anisole with acetic anhydride. The catalytic yields of
A series of catalysts with tungsten (W) loadings varying from 0.5 to 11.4 wt.% was prepared by WO 3 /ZrO 2 WO 3 incipient wetness impregnation. The surface coverage of these catalysts was monitored by ion scattering spectroscopy (ISS) and low-temperature CO adsorption. Comparable values for the sur