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Essentials of Chemical Reaction Engineering by H. Scott Fogler

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1.4.3 Packed-Bed Reactor (PBR)

The principal difference between reactor design calculations involving homogeneous reactions and those involving fluid-solid heterogeneous reactions is that for the latter, the reaction takes place on the surface of the catalyst (see Chapter 10). Consequently, the reaction rate is based on mass of solid catalyst, W, rather than on reactor volume, V. For a fluid–solid heterogeneous system, the rate of reaction of a species A is defined as

image = mol A reacted/(time × mass of catalyst)

The mass of solid catalyst is used because the amount of catalyst is what is important to the rate of product formation. The reactor volume ...

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