Dry methane reforming with carbon dioxide in a directly irradiated particle receiver seeded with carbon black is presented in this study. Carbon particles were entrained in the reacting gases and acted as heat transfer and reaction surface. The reactions were not catalyzed by a metal catalyst. The molar ratio between the entrained carbon particles and the working gases (Ar, , and ) was 4–7 mmol carbon/mol gas. The temperature of the reforming experiments varied from to with ratios varying from 1:1 to 1:6. Experimental results show that methane reacts at lower temperatures than expected for its thermal decomposition; this indicates that the decomposing reaction is enhanced by the presence of the carbon black particles. At 90% of the methane reacted in the receiver during a residence time of 0.3 s. The reaction between carbon dioxide and carbon black is faster than is documented in the literature, but the reaction rate does not seem to change if only carbon dioxide and carbon black are present in the receiver, compared with experiments where methane is also part of the gas mixture. The experimental results indicate that a high solar flux, i.e., about or higher, significantly accelerates the reaction rate of methane decomposition. Total or partial blockage of the solar radiation reduced the yield by about 50%, compared with tests when the receiver was exposed to the full solar radiation flux, at the same operating temperature.
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May 2009
Research Papers
Dry Methane Reforming Without a Metal Catalyst in a Directly Irradiated Solar Particle Reactor
Hanna Helena Klein,
Hanna Helena Klein
Department of Environmental Science and Energy Research,
Weizmann Institute
, Israel
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Jacob Karni,
Jacob Karni
Department of Environmental Science and Energy Research,
Weizmann Institute
, Israel
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Rachamim Rubin
Rachamim Rubin
Solar Energy Facility,
Weizmann Institute
, Israel
Search for other works by this author on:
Hanna Helena Klein
Department of Environmental Science and Energy Research,
Weizmann Institute
, Israel
Jacob Karni
Department of Environmental Science and Energy Research,
Weizmann Institute
, Israel
Rachamim Rubin
Solar Energy Facility,
Weizmann Institute
, IsraelJ. Sol. Energy Eng. May 2009, 131(2): 021001 (14 pages)
Published Online: March 11, 2009
Article history
Received:
November 24, 2007
Revised:
August 11, 2008
Published:
March 11, 2009
Citation
Klein, H. H., Karni, J., and Rubin, R. (March 11, 2009). "Dry Methane Reforming Without a Metal Catalyst in a Directly Irradiated Solar Particle Reactor." ASME. J. Sol. Energy Eng. May 2009; 131(2): 021001. https://doi.org/10.1115/1.3090823
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