Catalytic Kinetics: sabatier
Catalytic reaction kinetics data — activation energy, pre-exponential factors, rate expressions, selectivity, conversion, and deactivation rates for industrial catalytic processes
| reaction id | catalyst id | activation energy kJ mol (kJ/mol) | catalyst name | conversion pct typical (%) | deactivation rate hr (1/hr) | equilibrium constant expression | notes | pre exponential factor | pre exponential units | pressure range bar | rate expression | rate law type | reaction order forward | reaction stoichiometry | selectivity pct (%) | space velocity hr | temperature range C |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| sabatier | ni_al2o3_methanation | 129 | Ni/Al2O3 CO2 methanation (Sabatier) | 65 | 0.00002 | Keq = exp(16322/T - 19.36) | Apparent Ea 129 kJ/mol (Ni/Al2O3); Koschany et al (2016) power law n=0.34 CO2 n=0.88 H2; exothermic 165 kJ/mol; favored below 350C | 1,000,000,000 | mol/kg_cat/s/bar^n | 1-30 | r = A*exp(-Ea/RT)*P_CO2^0.34*P_H2^0.88*(1 - P_CH4*P_H2O^2/(Keq*P_CO2*P_H2^4)) | power_law | 0.34 | CO2 + 4H2 → CH4 + 2H2O | 95 | 2000-20000 | 250-450 |
| sabatier | ni_ceo2_methanation | 103.9 | Ni/CeO2 CO2 methanation | 75 | 0.00001 | Keq = exp(16322/T - 19.36) | CeO2 support improves oxygen mobility and CO2 activation; Ea 103.9 kJ/mol from Iecr 2022 | 500,000,000 | mol/kg_cat/s | 1-30 | r = A*exp(-Ea/RT)*P_CO2^0.5*P_H2^1.0 / (1+K_CO2*P_CO2)^2 | langmuir_hinshelwood | 0.5 | CO2 + 4H2 → CH4 + 2H2O | 97 | 2000-15000 | 250-400 |
| sabatier | ru_al2o3_methanation | 84 | Ru/Al2O3 CO2 methanation (Sabatier) | 80 | 0.000005 | Keq = exp(16322/T - 19.36) | Ru/Al2O3 lower Ea 84 kJ/mol; higher activity at lower temperature vs Ni; Ea range 66-100 kJ/mol in literature | 25,000,000 | mol/kg_cat/s/bar^n | 1-20 | r = A*exp(-Ea/RT)*P_CO2^0.34*P_H2^0.88 | power_law | 0.34 | CO2 + 4H2 → CH4 + 2H2O | 98 | 2000-15000 | 200-400 |
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