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RESEARCH PAPERS

Carbonate Composite Catalyst with High-Temperature Thermal Storage for Use in Solar Tubular Reformers

[+] Author and Article Information
Tsuyoshi Hatamachi

 Department of Chemistry and Chemical Engineering, Faculty of Engineering, Niigata University, 8050 Ikarashi 2-nocho, Niigata 950-2181, Japan

Tatsuya Kodama

 Department of Chemistry and Chemical Engineering, Faculty of Engineering, Niigata University, 8050 Ikarashi 2-nocho, Niigata 950-2181, Japantkodama@eng.niigata-u.ac.jp

Yuuki Isobe

 Graduate School of Science and Technology, Niigata University, 8050 Ikarashi 2-nocho, Niigata 950-2181, Japan

J. Sol. Energy Eng 127(3), 396-400 (Nov 04, 2004) (5 pages) doi:10.1115/1.1878853 History: Received April 30, 2004; Revised November 04, 2004

The composite materials of Ni-applied, porous zirconia balls with molten Na2CO3 salt were examined for use in solar thermochemical reforming of methane as the catalyst with high-temperature thermal storage. The millimeter-sized composite balls were tested on the heat discharge property and the catalytic activity for CO2 reforming of methane in a laboratory-scale reactor. The high heat capacity and large latent heat (heat of solidification) of the composite molten salt circumvented the temperature dropping of the catalyst bed, which resulted in the alleviation of rapid decay in chemical conversion during cooling mode of the reactor. The composite catalyst is expected to realize stable operation in the solar reformer under fluctuation of insolation by a cloud passage.

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Copyright © 2005 by American Society of Mechanical Engineers
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Figures

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Figure 6

Optical microscope photograph of the carbonate composite catalyst after 4 days operation. The S/C value was 0.5 and the Ni loading was 10 wt %.

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Figure 7

Time variations of methane conversion and bed temperature during cooling mode of the tubular reactor. The S/C value of composite catalyst was set to 0.5. The CH4–CO2 mixture (CH4:CO2 mole ratio of 1:2) was preheated at 773 K and passed into the reactor at a flow rate of 300cm3min−1.

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Figure 1

Experimental apparatus for reforming performance test of the carbonate composite catalyst during cooling mode

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Figure 2

Temperature profile of the carbonate/zirconia composite balls during the heat-discharge mode. The S/C value of the composite balls was set to 0.5. CO2 gas was preheated at 773 K and passed at a flow rate of 500cm3min−1.

Grahic Jump Location
Figure 3

Bed temperature of the Na2CO3∕ZrO2composite balls at 5 min of the cooling mode against the flow rate of the CO2feed. The S/C value of the composite was set to 0.5. CO2 gas was preheated at 773 K and passed through the reactor.

Grahic Jump Location
Figure 5

Relation between methane conversion after the four days operation by the composite catalyst and the various S/C values. The reactor was externally heated to 1143 K by an infrared furnace while passing the CH4–CO2 mixture (CH4:CO2 mole ratio of 1:2) at a flow rate of 300cm3min−1.

Grahic Jump Location
Figure 4

Time variations of methane conversion and H2∕COratio of the product gas during the intermittent operation of CO2reforming of methane by the carbonate composite catalyst with various S/C values. The reactor was externally heated to 1143 K by an infrared furnace while passing the CH4–CO2 mixture (CH4:CO2 mole ratio of 1:2) at a flow rate of 300cm3min−1. Symbols: S∕C=0.5 (엯) and S∕C=0.56 (◆) and S∕C=0.67 (◻).

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