Artículo
Behaviour of smooth catalysts at high reaction rates
Keegan, Sergio Dario
; Mariani, Nestor Javier
; Martinez, Osvaldo Miguel
; Barreto, Guillermo Fernando
Fecha de publicación:
01/06/2005
Editorial:
Elsevier Science Sa
Revista:
Chemical Engineering Journal
ISSN:
1385-8947
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
In evaluating effective reaction rates in catalysts subject to heat and mass transport limitations, the size of the catalytic body is best defined by the so-called characteristic length ℓ, the ratio between catalyst volume and its external surface area, ℓ = Vp/Sp. This result follows from the limiting behaviour at very high reaction rates, when the effective reaction rates are proportional to 1/ℓ (e.g., Aris [R. Aris, The Mathematical Theory of Diffusion and Reaction in Permeable Catalysts, Oxford University Press, London, 1975.]) or, in dimensionless form, to the inverse of the Thiele modulus Φ. It is further known from simple geometrical shapes that a series solution can be written in terms of powers of (1/Φ) and that the second order term [in(1/Φ)2] depends on the shape of the catalytic body. It is the aim of this paper to develop expressions of such second order term for 2D or 3D catalytic bodies showing arbitrary smooth external surfaces. In a similar way as the first order term allows to define the proper size of a catalyst, the second order term provides a characterization for the catalyst shape. This and other applications of the second order term are discussed.
Palabras clave:
Catalytic Reactions
,
Diffusion-Reaction
,
Effectiveness Factor
,
Shape Factor
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Articulos(CINDECA)
Articulos de CENTRO DE INV EN CS.APLICADAS "DR.JORGE J.RONCO"
Articulos de CENTRO DE INV EN CS.APLICADAS "DR.JORGE J.RONCO"
Citación
Keegan, Sergio Dario; Mariani, Nestor Javier; Martinez, Osvaldo Miguel; Barreto, Guillermo Fernando; Behaviour of smooth catalysts at high reaction rates; Elsevier Science Sa; Chemical Engineering Journal; 110; 1-3; 1-6-2005; 41-56
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