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The catalytic reaction A Æ B takes place within a fixed bed containing spherical porous catalyst X22 Figure 1 shows the overall rates of reaction at a point in the reactor as a function of

The catalytic reaction (A Æ B) takes place within a fixed bed containing spherical porous catalyst X22. Figure 1 shows the overall rates of reaction at a point in the reactor as a function of temperature for various entering total molar flow rates, FT0. a) Is the reaction limited by external diffusion? b) If your answer to part (a) was “yes,” under what conditions [of those shown (i.e. T, FT0)] is the reaction limited by external diffusion? c) Is the reaction “reaction-rate-limited”? d) If your answer to part (c) was “yes,” under what conditions [of those shown (i.e. T, FT0)] is the reaction limited by the rate of the surf e) Is the reaction limited by internal diffusion? f) If your answer to part (e) was “yes,” under what conditions [of those shown (i.e. T, FT0)] is the reaction limited by the rate of internal diffusion? g) For a flow rate of 10 mol/hr, determine (if possible) the overall effectiveness factor, ?, at 360 K. h) Estimate (if possible) the internal effectiveness factor, ?, at 367 K. i) If the concentration at the external catalyst surface is 1 mol/L, calculate (if possible) the concentration at r = R/2 inside the porous catalyst at 367 K. j) If the reactor must achieve a conversion X=0.05, qualitatively sketch how the length of the reactor will have to vary with T and with FT0. Assume the reactor is isothermal

 

Jul 24 2020 View more View Less

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