H + HCO (+M) -> CH2O (+M)

k_inf = 1.09E+12 T^0.48 exp(260 cal/mol /RT) cm3/mol s

F_cent = (1-0.782) exp(-T/271) + 0.782 exp(-T/2755) + exp(-6570/T)

Third-body efficiencies:

N2                    1.0 
H2     Enhanced by    2.0 
H2O    Enhanced by    6.0 
CH4    Enhanced by    2.0 
CO     Enhanced by    1.5 
CO2    Enhanced by    2.0 
C2H6   Enhanced by    3.0 
AR     Enhanced by    0.7 

SOURCE:

Eiteneer, B., Yu, C.-L., Goldenberg, M., and Frenklach, M. (1998) J. Phys. Chem. A 1998, 102, 5196.

COMMENTS:

The pressure broadening is expressed in the Troe form.

Served as an optimization variable in GRI-Mech 3.0 release and was not changed. Optimization revealed a strong correlation between rate coefficients of reactions
54. H + HCO + M -> CH2O + M and
58. H + CH2O -> HCO + H2,
based on optimization targets from Eiteneer et al. (1998) The above rate expression was obtained with k(58) fixed at recommendation of Irdam et al. (1993)

LITERATURE

                        PRESSURE = 0.1 atm N2  
______________________________________________________________________
    Temp      delta-S     delta-H      kf          kr         Keq     
     (K)    (cal/mol K)  (kcal/mol) ----(mol,cm3,s)-----   (mol/cm3)  
______________________________________________________________________
                                                                      
     300       -28.8       -88.1    1.78E+12    9.31E-51    1.91E+62
     500       -31.0       -89.0    4.05E+11    7.67E-26    5.28E+36
    1000       -32.9       -90.3    4.22E+10    1.48E-07    2.84E+17
    1500       -33.3       -90.8    1.05E+10    9.72E-02    1.08E+11
    2000       -33.4       -90.9    3.86E+09    5.45E+01    7.08E+07
    2500       -33.4       -90.8    1.77E+09    1.94E+03    9.14E+05
    3000       -33.3       -90.7    9.40E+08    1.80E+04    5.23E+04
______________________________________________________________________


                        PRESSURE = 1 atm N2    
______________________________________________________________________
    Temp      delta-S     delta-H      kf          kr         Keq     
     (K)    (cal/mol K)  (kcal/mol) ----(mol,cm3,s)-----   (mol/cm3)  
______________________________________________________________________
                                                                      
     300       -28.8       -88.1    9.41E+12    4.93E-50    1.91E+62
     500       -31.0       -89.0    3.22E+12    6.10E-25    5.28E+36
    1000       -32.9       -90.3    3.90E+11    1.37E-06    2.84E+17
    1500       -33.3       -90.8    9.88E+10    9.15E-01    1.08E+11
    2000       -33.4       -90.9    3.66E+10    5.16E+02    7.08E+07
    2500       -33.4       -90.8    1.69E+10    1.85E+04    9.14E+05
    3000       -33.3       -90.7    9.01E+09    1.72E+05    5.23E+04
______________________________________________________________________


                        PRESSURE = 10 atm N2   
______________________________________________________________________
    Temp      delta-S     delta-H      kf          kr         Keq     
     (K)    (cal/mol K)  (kcal/mol) ----(mol,cm3,s)-----   (mol/cm3)  
______________________________________________________________________
                                                                      
     300       -28.8       -88.1    1.96E+13    1.03E-49    1.91E+62
     500       -31.0       -89.0    1.19E+13    2.26E-24    5.28E+36
    1000       -32.9       -90.3    2.98E+12    1.05E-05    2.84E+17
    1500       -33.3       -90.8    8.52E+11    7.89E+00    1.08E+11
    2000       -33.4       -90.9    3.27E+11    4.62E+03    7.08E+07
    2500       -33.4       -90.8    1.54E+11    1.68E+05    9.14E+05
    3000       -33.3       -90.7    8.33E+10    1.59E+06    5.23E+04
______________________________________________________________________