CHEN3010 Lecture Notes - Lecture 14: Thermal Conductivity, Computer-Aided Technologies, Heterogeneous Catalysis

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2 Jul 2018

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Chemical Reaction Engineering

Fogler Chapter 15

Diffusion and Reaction

Semester 1-2018

Gia Hung Pham

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Diffusion and reaction

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Two steps involve in the reaction (Internal mass transfer and surface

reaction )

Gas

CAb= CAs

Cat-A

Cat-P

Catalyst palette

Catalyst pore

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Document Summary

Two steps involve in the reaction (internal mass transfer and surface reaction ) In order to calculate the effective reaction rate we need to know the concentration ca in the catalyst pore. Reaction taking place on the walls of the pore. Material balance for this slice of catalyst pore. First-order reaction is expressed in terms of unit catalyst surface area kv. 2 r r 2 x: divide by. For x (cid:1004) a(cid:374)d i(cid:374) ter(cid:373)s of volu(cid:373)etric u(cid:374)it. This equation can be solved analytically with the boundary conditions (fogler. General solution of the above equation ememc mx. As xlm ml e xlm ml e e. With the boundary conditions: ca = cas at x=0 and dca/dx=0 at x=l. Concentration of reactant a in catalyst pore with m k. Ab and we call ml = 1 (thiele modulus) Single cylindrical pore first order rea(cid:272)tio(cid:374) (cid:894) a p(cid:895) Reaction taking place at the walls of the pore.

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CHEN3010 Lecture Notes - Lecture 14: Thermal Conductivity, Computer-Aided Technologies, Heterogeneous Catalysis

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