Pore Diffusion Resistance Combined with Surface Kinetics

Thus it is hardly ever possible to determine with reasonable confidence which is the correct mechanism. [Pg.381]

Problems of Combining Resistances. Suppose that we have found the correct mechanism and resultant rate equation for the surface phenomenon. Combining this step with any of the other resistance steps, such as pore of film diffusion, becomes rather impractical. When this has to be done, it is best to replace the multiconstant rate equation by an equivalent first-order expression, which can then be combined with other reaction steps to yield an overall rate expression. [Pg.381]

Summary on Surface Kinetics. From this discussion we conclude that it is good enough to use the simplest available correlating rate expression, hence first-order or nth-order kinetics, to represent the surface reaction. [Pg.381]

For additional comments questioning the validity of the active-site approach, suggesting forms of kinetic equations to be used in reactor design, and suggesting what is the real utility of the active site theory, see the opposing points of view presented by Weller (1956) and Boudart (1956). [Pg.381]

2 PORE DIFFUSION RESISTANCE COMBINED WITH SURFACE KINETICS [Pg.381]

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