Methane Surface Mechanism

Surface Reaction Mechanism of Methane Oxidation on Platinum
REACTIONa Ab Sc b Ead
ADSORPTION
A1 O2+2PT(*) => 2O(*)+2PT(B)
0.003 0.0 0.00
A2 CH4+2PT(*) => CH3(*)+H(*)+2PT(B)
0.150 0.0 27.00
A3 CH4+O(*)+PT(*) => CH3(*)+OH(*)+PT(B)
0.430 0.0 59.20
A4 CO+PT(*) => CO(*)+PT(B)
0.840 0.0 0.00
A5 H2+2PT(*) => H(*)+H(*)+2PT(B)
0.046 0.0 0.00
A6 OH+PT(*) => OH(*)+PT(B)
1.000 0.0 0.00
A7 H2O+PT(*) => H2O(*)+PT(B)
0.500 0.0 0.00
SURFACE REACTION
S1 CH3(*)+PT(*) => CH2(*)+H(*)+PT(B) 1.0E+21
0.0 20.00
S2 CH2(*)+PT(*) => CH(*)+H(*)+PT(B) 1.0E+21
0.0 20.00
S3 CH(*)+PT(*) => C(*)+H(*)+PT(B) 1.0E+21
0.0 20.00
S4 H(*)+O(*)+PT(B) => OH(*)+PT(*) 1.0E+20
0.0 10.50
S5 OH(*)+PT(*) => H(*)+O(*)+PT(B) 1.0E+12
0.0 20.80
S6 H(*)+OH(*)+PT(B) => H2O(*)+PT(*) 1.0E+21
0.0 62.50
S7 2OH(*) => H2O(*)+O(*) 1.0E+20
0.0 51.25
S8 H2O(*)+PT(*) => OH(*)+H(*)+PT(B) 1.8E+13
0.0 54.20
S9 C(*)+O(*)+PT(B) => CO(*)+PT(*) 5.0E+20
0.0 62.50
S10 CO(*)+PT(*) => C(*)+O(*)+PT(B) 1.0E+13
0.0 156.50
S11 CO(*)+O(*)+2PT(B) => CO2+2PT(*) 4.0E+20
0.0 49.14
DESORPTION
D1 2O(*)+2PT(B) => O2+2PT(*) 1.0E+21
0.0 216.00
D2 CO(*)+PT(B) => CO+PT(*) 8.5E+12
0.0 152.50
D3 2H(*)+2PT(B) => H2+2PT(*) 5.0E+20
0.0 67.40
D4 OH(*)+PT(B) => OH+PT(*) 1.5E+13
0.0 192.80
D5 H2O(*)+PT(B) => H2O+PT(*) 1.0E+13
0.0 45.00


  1. The expression of the ith reaction (in SURFACE CHEMKIN format).
  2. Pre-exponential factor in units of cm-mole-sec.
  3. Sticking coefficient.
  4. Activation energy (kJ/mole-1).
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