Clean Air: International Journal on Energy for a Clean Environment

ISSN for PRINT: 1561-4417

For Online Access

Best Paper Award Selection - Editorial Board Site

2006, Volume7

Issue 3

123 pages

DOI: 10.1615/InterJEnerCleanEnv.v7.i3

Issue price - $128.00

V. Dupont
Energy and Resources Research Institute, University of Leeds, Leeds LS2 9JT, UK

S.-H. Zhang
Thermal Engineering and Fluids Division, Beijing Institute of Civil Engineering and Architecture, Beijing 100044, China

J. M. Jones
Energy and Resources Research Institute / Centre for Computational Fluid Dynamics, University of Leeds, Leeds LS2 9JT, UK

G. Rickett
Energy and Resources Research Institute, University of Leeds, Leeds LS2 9JT, UK

M. V. Twigg
Johnson Matthey, Catalytic Systems Division, Royston SG8 5HE, UK

The kinetic parameters of the lean oxidation of CH₄, H₂S, and SO₂ on a Pt foil and on Pt/Al₂O₃ and Pt/CeO₂/Al₂O₃ catalysts were derived in a stagnation point flow reactor under atmospheric pressure and at temperatures up to 900 °C. Kinetic mechanisms were devised using a novel methodology. Doping the N₂-diluted CH₄-air reactant flow with H₂S and SO₂ concentrations had a significant promotional effect on the methane combustion rate for all Pt catalysts tested. At the temperatures tested, alumina and alumina-ceria supports oxidized only H₂S to SO₂, showing no net conversion of CH₄ to CO₂ or of SO₂ to SO₃. In contrast, Pt foil and the supported Pt were good catalysts of CH₄, H₂S, and SO₂ oxidation. A temperature window of conversion of SO₂ to SO₃ on the Pt/Al₂O₃ catalyst was observed. This window could be used in SO_x removal techniques of combustion exhausts. One-step and two-step chemical reaction mechanisms were devised for the CH₄ and SO₂ oxidations, respectively. The conversion of H₂S and its selectivity to SO₂ and SO₃ on the Pt-alumina catalysts were accurately reproduced using a three-step mechanism.

DOI: 10.1615/InterJEnerCleanEnv.v7.i3.30 Download article, 221-238 pages

Article price - $35.00

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