Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Thiele modulus cylindrical catalyst pellets

No practical catalyst pellet can be described by the geometry of the wafer, yet it will be shown that eqn. (6), albeit with a slightly different interpretation of the Thiele modulus, 0, is of practical value. For a cylindrical catalyst pellet (a shape often used in practice) of radius r and sealed at its flat ends... [Pg.157]

N.B. For a cylindrical pellet, L (i.e., Le) in the Thiele modulus is RI2> where R is the radius. 8-20 Suppose experiments were conducted to characterize the performance of a catalyst for a certain reaction (A - products) that is first-order. The following data refer to experiments with... [Pg.223]

The parameter ag= 1, 2, 3, for flat plate, cylindrical, or spherical geometry respectively. In the Thiele modulus, the character distance L = L (a half of thickness of catalyst pellet) for flat plate, L = r<, (the radius of catalyst pellet) for cylindrical, or spherical geometry. [Pg.229]

Metal deposition occurs with sharp gradients within a catalyst pellet, usually concentrated on the outside of catalyst pellets forming a U-shaped distribution. Sato et at [3] related this metal deposition with simultaneous diffusion and reaction, and suggested a value of 8 for the Thiele modulus in a slab geometry. Tamm [4] suggested that this distribution can be characterized by a theta factor defined in a cylindrical geometry as... [Pg.333]


See other pages where Thiele modulus cylindrical catalyst pellets is mentioned: [Pg.131]   
See also in sourсe #XX -- [ Pg.204 ]




SEARCH



Catalyst pellet

Cylindrical catalyst pellets

Cylindrical pellets

Pelleted catalysts

THIELE

Thiele modulus

© 2024 chempedia.info