CH2 + CH2 -> H2 + C2H2

SOURCE:

Tsang, W., and Hampson, R.F. (1986) J. Phys. Chem. Ref. Data 15, 1087.

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    Temp      delta-S     delta-H      kf          kr         Keq
     (K)    (cal/mol K)  (kcal/mol) ----(mol,cm3,s)-----   
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     300       -13.7      -133.0    3.20E+13    4.05E-81    7.90E+93
     500       -13.0      -132.7    3.20E+13    2.15E-42    1.49E+55
    1000       -11.5      -131.6    3.20E+13    1.77E-13    1.81E+26
    1500       -10.6      -130.6    3.20E+13    6.36E-04    5.03E+16
    2000       -10.0      -129.5    3.20E+13    3.48E+01    9.20E+11
    2500        -9.4      -128.2    3.20E+13    2.28E+04    1.40E+09
    3000        -8.9      -126.8    3.20E+13    1.65E+06    1.94E+07
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