Thermal Stability and Hydrolysis Catalysts Effect on Sol-Gel Zirconia in The Presence of Heteropolyacids View Full Text


Ontology type: schema:Chapter     


Chapter Info

DATE

2003

AUTHORS

J. G. Hernández-Cortéz , T. López , D. H. Aguilar , P. Quintana

ABSTRACT

Zirconia catalysts with 15 and 25 wt% of tungstophosphoric acid (TPA) were prepared by the sol gel method. The gels were obtained by catalytic hydrolysis of zirconium n-butoxide and TPA, at pH= 3, 5 and 7, using as catalysts HCl, C2H4O2 and NH4OH, respectively. Fresh samples were thermally treated from 100°C to 900 °C, in a stepwise increments of 100°C, during 20 hours per step. The crystallization behavior was followed by powder X-ray diffraction.From the x-ray data, it was clear that the 25% TPA samples formed a solid solution with tetragonal zirconia, since the presence of tungsten compounds was not detected up to 1000 °C; whereas in the lower content samples, TPA was surface dispersed, and dissociates to form several tungsten compounds near 700 °C.Brönsted and Lewis acidity was measured by FTIR pyridine adsorption. Lewis sites were detected for both TPA compositions, whereas Brönsted sites were present only in the 25% samples. A model is proposed to explain the stabilization of TPA in zirconia. More... »

PAGES

221-229

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/978-1-4615-0449-8_24

DOI

http://dx.doi.org/10.1007/978-1-4615-0449-8_24

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1041099433


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