Utilization ratio of the inner surface

The particle size of catalyst is an important parameter for an industrial catalyst. It not only significantly affects the pressure drop of the reaction gas through the catalyst bed, but also affects the diffusion rate, and thus the macro reaction rate. Reducing the size of catalyst can increase the utilization ratio of the inner surface of catalyst and decrease the influence of intraparticle diffusion, improve the macro reaction rate, and reduce the needed amount of catalyst. Reducing the amount of catalyst can reduce the height of catalyst bed and pressure drop. However, if the particle size of catalysts is reduced, the resistance of unit bed of catalyst to gas flow increases and power consumption for gas transmission also increases. Thus the particle size of catalyst has contradictory effects on a reactor. 

Table 8.16 Relationship between particle size and outlet ammonia concentration, reaction rate, the utilization ratio of the inner surface of A301 (7.0 MPa, 6000h ) ...

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See also in sourсe #XX -- [ , , ]

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