Methane Steam Reforming Kinetic Relationships

The reaction rate constants , ki s, are functions of temperature, activation energies, and frequency factors, in the classic Arrhenius form  

Similarly, the adsorption equilibrium constants are functions of temperature, heats of adsorption, and a frequency factor  

The reaction equilibrium constants are functions of temperature. The equilibrium constants as a function of temperature are listed in References 3 and 4. Those of Reference 3 were used, and have been tabulated and regressed, with results listed in Appendix E. 

The kinetics discussed so far are intrinsic kinetics that are valid in the absence of difihisional or heat transfer resistances. Bulk phase eoneentrations (partial pressures) and temperatures are not present at the active sites within the catalyst pellets, since the pore structure offers very significant resistance to diffusion, and mild resistance to heat transfer exists between the bulk phase and the pellet surface. Little resistance to heat transfer exists within the pellets (Reference 4, page 69). 

The difflisional effects are accoimted for using the classic effectiveness 

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