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A quenching apparatus for the gaseous products of the solar thermal dissociation of ZnO

Gstoehl, D. ; Brambilla, A. ; Schunk, L. ; Steinfeld, A.

In: Journal of Materials Science, 2008, vol. 43, no. 14, p. 4729-4736

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    Title
    • A quenching apparatus for the gaseous products of the solar thermal dissociation of ZnO
    Author
    • Gstoehl, D.. Solar Technology Laboratory, Paul Scherrer Institute, 5232, Villigen, Switzerland
    • Brambilla, A.. Solar Technology Laboratory, Paul Scherrer Institute, 5232, Villigen, Switzerland
    • Schunk, L.. Solar Technology Laboratory, Paul Scherrer Institute, 5232, Villigen, Switzerland
    • Steinfeld, A.. Solar Technology Laboratory, Paul Scherrer Institute, 5232, Villigen, Switzerland
    Document Type
    • Postprint
    Language
    • English
    Published in
    • Journal of Materials Science, 2008, vol. 43, no. 14, p. 4729-4736. Springer US; http://www.springer-ny.com
    Other Version
    Classification
    • Engineering
    OAI-PMH Identifier
    • oai:doc.rero.ch:317663
    Summary
    Rapid cooling for avoiding the recombination of Zn vapor and O2 derived from the solar thermal dissociation of ZnO is investigated using a thermogravimeter coupled to a quenching apparatus. The ZnO sample, which is placed in a cavity receiver and directly exposed to concentrated solar irradiation, underwent dissociation in the temperature range 1,820-2,050K at a rate monitored by on-line thermogravimetry. The product gases were quenched by water-cooled surfaces and by injection of cold Ar at cooling rates from 20,000 to 120,000K/s, suppressing the formation of ZnO in the gas phase and at the walls. Zinc content of the collected particles downstream varied in the range 40-94% for Ar/Zn(g) dilutions of 170 to 1,500