Pore Diffusion Resistance and Effective Reaction Rate

1 Pore Diffusion Resistance and Effective Reaction Rate 

In Section 4.5.3, we introduced effectiveness factors to derive universally valid equations for the interplay of the chemical reaction with the external and internal mass tranfer. Now we inspect pore diffusion in more detail, first for a single pore and then for particles. 

Single Cylindrical Pore In contrast to the interplay of chemical reaction with interfacial mass transfer, a reaction at the walls of the pores of a solid catalyst and the internal mass transfer by pore diffusion are not consecutive processes. For a single cylindrical pore of length L and a reactant A diffusing into the pore, where a first-order reaction takes place at the pore surface, we obtain  

Yakov Borisovich Zeldovich (1914-1987), a Russian physicist, played an important role in the development of Soviet nuclear weapons, and made important contributions to the fields of adsorption and catalysis, the theory of ignition and combustion, astrophysics, and general relativity. 

Albert Einstein (1879-1955) a German physicist and one of the most important scientists of the twentieth century. He formuiated the spe-ciai and generai theories of reiativity, and made significant contributions to quantum mechanics, statisticai mechanics, and cosmology. He was awarded the 1921 Nobel Prize in Physics for his explanation of the photoelectric effect. 

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