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Hydrogen Production by Bio-Fuel Steam Reforming at Low Reaction Temperature

[+] Author Affiliations
Tsuyoshi Maeda, Jiro Funaki, Katsuya Hirata

Doshisha University, Kyoto, Japan

Toshio Shinoki

Mitsubishi Electric Corporation, Amagasaki, Japan

Paper No. POWER2011-55383, pp. 169-177; 9 pages
doi:10.1115/POWER2011-55383
From:
  • ASME 2011 Power Conference collocated with JSME ICOPE 2011
  • ASME 2011 Power Conference, Volume 1
  • Denver, Colorado, USA, July 12–14, 2011
  • ISBN: 978-0-7918-4459-5
  • Copyright © 2011 by ASME

abstract

The authors reveal the dominant chemical reactions and the optimum conditions, supposing the design of ethanol steam-reforming reactors. Specifically speaking, experiments are conducted for Cu/ZnO/Al2 O3 catalyst, together with those for Ru/Al2 O3 catalyst for reference. Using a household-use-scale reactor with well-controlled temperature distributions, the authors compare experimental results with chemical-equilibrium theories. It has revealed by Shinoki et al. (2011) that the Cu/ZnO/Al2 O3 catalyst shows rather high performance with high hydrogen concentration CH2 at low values of reaction temperature TR . Because, the Cu/ZnO/Al2 O3 catalyst promotes the ethanol-steam-reforming and water-gas-shift reactions, but does not promote the methanation reaction. So, in the present study, the authors reveal that the Ru/Al2 O3 catalyst needs high TR > 770 K for better performance than the Cu/ZnO/Al2 O3 catalyst, and that the Ru/Al2 O3 catalyst shows lower performance at TR < 770 K. Then, the Ru/Al2 O3 catalyst is considered to activate all the three reactions even at low TR . Furthermore, concerning the Cu/ZnO/Al2 O3 catalyst, the authors reveal the influences of liquid-hourly space velocity LHSV upon concentrations such as CH2 , CCO2 , CCO and CCH4 and the influence of LHSV upon the ethanol conversion XC2H5OH , in a range of LHSV from 0.05 h−1 to 0.8 h−1 , at S/C = 3.0 and TR = 520 K. And, the authors reveal the influences of the thermal profile upon CH2 , CCO2 , CCO , CCH4 and XC2H5OH , for several LHSV’s. To conclude, with well-controlled temperatures, the reformed gas can be close to the theory. In addition, the authors investigate the influences of S/C.

Copyright © 2011 by ASME

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