Read e-book online Catalyst Design: Optimal Distribution of Catalyst in PDF

By Massimo Morbidelli

ISBN-10: 0511721765

ISBN-13: 9780511721762

ISBN-10: 0521019850

ISBN-13: 9780521019859

ISBN-10: 0521660599

ISBN-13: 9780521660594

Because heterogeneous catalysis is widespread in chemical, refinery, and pollution-control tactics, reaching optimum catalytic functionality is an important factor for chemical engineers and chemists. This booklet addresses the query of the way catalytic fabric will be disbursed inside of a porous help to acquire optimum functionality. It treats unmarried and a number of response platforms, isothermal and nonisothermal stipulations, pellets, monoliths, fixed-bed reactors, and membrane reactors. the consequences of physicochemical and working parameters are analyzed to realize perception into the underlying phenomena governing the functionality of optimally designed catalysts. all through, the authors provide a balanced remedy of concept and test and rigidity difficulties of industrial significance.

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Additional resources for Catalyst Design: Optimal Distribution of Catalyst in Pellets, Reactors, and Membranes (Cambridge Series in Chemical Engineering)

Sample text

The optimal catalyst location s¯ opt is obtained by identifying the s¯ value in the interval [0, 1] which maximizes the desired performance index. Note that for a given reacting system, the optimal catalyst location s¯ opt depends strongly on whether the performance index considered is effectiveness, selectivity, or yield. 3, we have been concerned with optimization of the catalyst activity distribution. However, when preparing a catalyst we have control over the catalyst loading distribution. Therefore it is desirable to use catalyst loading directly as the optimization variable.

96d) where ui = Ci /Cf,1 , s = x/R, Di = De,1 /De,i φ 2j = r j (Cf,1 , Cf,1 , . . , Cf,1 , Tf )R2 /De,1 Cf,1 f j (u, θ) = r j (C1 , C2 , . . , CI , T)/r j (Cf,1 , Cf,1 , . . 66). Several indexes can be used to evaluate the performance of a catalyst pellet when multiple reactions occur. These include the effectiveness factor, which represents the overall consumption rate of a certain reactant; the selectivity, which represents the fraction of a given reactant to a desired product; and the yield, which represents the overall production rate of a certain product.

96a) s = 1: dui = Bim,i (uf,i − ui ) ds (i = 1, . . 96d) where ui = Ci /Cf,1 , s = x/R, Di = De,1 /De,i φ 2j = r j (Cf,1 , Cf,1 , . . , Cf,1 , Tf )R2 /De,1 Cf,1 f j (u, θ) = r j (C1 , C2 , . . , CI , T)/r j (Cf,1 , Cf,1 , . . 66). Several indexes can be used to evaluate the performance of a catalyst pellet when multiple reactions occur. These include the effectiveness factor, which represents the overall consumption rate of a certain reactant; the selectivity, which represents the fraction of a given reactant to a desired product; and the yield, which represents the overall production rate of a certain product.

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Catalyst Design: Optimal Distribution of Catalyst in Pellets, Reactors, and Membranes (Cambridge Series in Chemical Engineering) by Massimo Morbidelli


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