Applied Heterogeneous Catalysis: Design, Manufacture, and by J. F. Le Page

By J. F. Le Page

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Extra resources for Applied Heterogeneous Catalysis: Design, Manufacture, and Use of Solid Catalysts

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The specific reaction rate, V, mol s - l g - 1 is then given by the equation: = • V= (2. 1 3) • PA 1 =� �C vpg dP V ---;;;-- • (2. 1 4) This equation of rate invites certain comments, as follows: • Even for strong diffusional limitations, the observed rate still depends on the chemical activity because V remains proportional to N · Under such conditions, the energy of activation therefore tends toward half of the value observed when the chemical reaction is limiting . } e (which also can be achieved by increasing the porosity and in certain cases the macroporosity.

Vol. 35, No. 3, 1 970. Externa l gradients C enter of catalyst particle I nternal g radients Simplifted illustration of reactant concentrations developed within a catalyst particle, where kd is the diffusion rate constant, k1 the reaction rate constant per unit surface, S the active surface, and C the concentration. FIG. ll For the two conditions: (a) kd � k1S, so that the reaction rate controls and C is the same within the catalyst pore as in the surrounding homogeneous phase. (b) kd

C) Design of an optimum process. REFERENCES [1] EMMET, P. H. , Catalysis, Vols I to VII. Reinhold, New York. [2] BOND, G. , " Principles of Catalysis. " The Chemical Society, Monographs for teachers No. 7, London, [3] GERMAIN, J. , Catalytic Conversion of Hydrocarbons. Academic Press, 1 969. 1 972. [4] GERMAIN, J. , " La catalyse de contact ". La Recherche, No. 1 6, Oct. 1 97 1 , Vol. 2, p. 835. [5] Advances in Catalysis, Academic Press, 23 volumes, 1941- 1973. [6] BOND, G. , Catalysis by Metals.

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