Inhibition effect of carbon dioxide on the oxidation of hydrogen over a platinum foil catalyst

This paper investigates the catalytic ignition of the H(2)/O(2)/CO(2) mixture on platinum in a stagnation flow at atmospheric pressure experimentally and numerically. We measure the ignition temperatures of the gas mixtures flowing towards resistively heated platinum with various composition ratios and various diluent gases of N(2), Ar and CO(2). Compared with N(2) or Ar, the CO(2) dilution shows higher ignition temperature by about 50 K, even at the same composition ratio. The ignition temperature increase is proportional to the dilution ratio. Through the numerical simulation, it is illustrated that higher ignition temperature is caused by the adsorption of CO(2) and following dissociation on platinum surface, which was to date considered negligible in catalytic combustion. (C) 2003 Elsevier B.V. All rights reserved.
Publisher
ELSEVIER SCIENCE BV
Issue Date
2003-08
Language
ENG
Keywords

GAS; COMBUSTION; CO2; CHEMISTRY; MIXTURES; SURFACES; OXYGEN; FLUID

Citation

CATALYSIS TODAY, v.83, pp.257 - 264

ISSN
0920-5861
URI
http://hdl.handle.net/10203/84608
Appears in Collection
ME-Journal Papers(저널논문)
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