Research Papers

Hydrolysis of Evaporated Zn in a Hot Wall Flow Reactor

[+] Author and Article Information
Tareq Abu Hamed, Jane H. Davidson, Mark Stolzenburg

Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN 55455

J. Sol. Energy Eng 130(4), 041010 (Sep 08, 2008) (7 pages) doi:10.1115/1.2969808 History: Received August 09, 2007; Revised December 13, 2007; Published September 08, 2008

Hydrolysis of Zn is investigated as the second step in a ZnOZn redox solar water splitting process. Zinc is evaporated and hydrolyzed with steam in a hot wall flow tubular reactor. The influence of the reactor temperature distribution and residence time on hydrogen conversion was measured for furnace set point temperatures of 1023K and 1073K. The yield of ZnO aerosol was measured in situ using a scanning differential mobility sizer. The composition and morphology of the solid product were characterized with X-ray diffraction and microscopy. Hydrogen conversions of 87–96% at temperatures above zinc saturation are attributed primarily to hydrolysis of zinc(g) at the wall of the reactor at temperatures from 800Kto1077K.

Copyright © 2008 by American Society of Mechanical Engineers
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Figure 1

The experimental apparatus

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Figure 2

The reaction zone wall and centerline temperature distributions. The furnace set point temperature is used as a reference to distinguish experiments.

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Figure 3

H2 production rate (a) 1023K and 1750ml∕min Ar, (b) 1073K and 1750ml∕min Ar, (c) 1023K and 2150ml∕min Ar, and (d) 1073K and 2150ml∕min Ar

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Figure 4

XRD analysis of the particles collected in (a) the heated reaction zone for 31≤x≤115cm, (b) the cooler end of the reaction zone for 115≤x≤123cm, and (c) the quartz tube downstream of the heated reactor for 123≤x≤150cm

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Figure 5

TEM images of (a) ZnO and (b) Zn nanoparticles synthesized at 1073K and 2150ml∕min. These particles were removed from the walls of the reactor.




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