NDLI: A Two-Step Water Splitting With Ferrite Particles and Its New Reactor Concept Using an Internally Circulating Fludized-Bed

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Gokon, Nobuyuki Mizuno, Takayuki Takahashi, Shingo Kodama, Tatsuya
Copyright Year	2006
Abstract	A thermochemical two-step water splitting cycle using a redox system of iron-based oxides or ferrites is one of the promising processes for converting and storing solar energy into a fuel in sunbelt regions. The ZrO2-supported ferrite (or the ferrite/ZrO2) powders exhibit superior performances on activity and repeatability of the cyclic reactions when compared to conventional unsupported ferrites. In the first step at 1400°C under an inert atmosphere, ferrite on ZrO2 support is thermally decomposed to the reduced phase of wustite that is oxidized back to ferrite on ZrO2 with steam in a separate second step at 1000°C. In this paper, a number of ZrO2-supporetd ferrites, Mn-, Mg-, Co-, Ni- and Co-Mn-ferrites, are examined on activity. The NiFe2O4/ZrO2 powder was found to have a greatest activity between them. This paper also describes a new concept of a windowed solar chemical reactor using an internally circulating fluidized bed of ferrite/ZrO2 particles. In this concept, concentrated solar radiation passes downwards through the transparent window and directly heats the internally circulating fluidized bed. The exploratory experimental studies on this reactor concept are carried out in a laboratory scale for the thermal decomposition of NiFe2O4/ZrO2 particle bed as part of two-step water splitting cycle.
Sponsorship	Solar Energy Division
Starting Page	205
Ending Page	214
Page Count	10
File Format	PDF
ISBN	0791847454
DOI	10.1115/ISEC2006-99063
Volume Number	Solar Energy
Conference Proceedings	ASME 2006 International Solar Energy Conference
Language	English
Publisher Date	2006-07-08
Publisher Place	Denver, Colorado, USA
Access Restriction	Subscribed
Subject Keyword	Water Cycles Transparency Ferrites (magnetic materials) Particulate matter Solar energy Steam Iron Solar chemistry Fuels Solar radiation Fluidized beds
Content Type	Text
Resource Type	Article

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