Masters Theses


Dar-Sen Horng


"The dusty-gas model is used to describe the molar fluxes of complex irreversible reactions with moles changes in isothermal porous catalysts.

The model presented in this work can be used for any number of independent reactions occurring in porous media as long as the number of independent reactions is equal to or less than the total number of species.

Systems of two parallel reactions involving a ternary mixture is used in this work. Five sets of reaction parameters are used for each reaction system and the overall selectivity and effectiveness factors are calculated for different geometric constants.

Results show that all the three geometric constants, C0, C1, and C2 will influence the total pressure within the porous medium. The total pressure inside the pellet may be 10% greater than that in the bulk fluid. For reaction system 1, one of the reaction systems studied, there is a local minimum of total pressure within the pellet.

It is observed that the effectiveness factor and the overall selectivity are not influenced by the Darcy's constant, C0, but are influenced by the geometric constants C1, and C2, especially when the mass resistance within the porous catalyst is very significant. This suggests that one can shorten the pellet length to enhance the diffusion. For various reactions in porous catalysts, one may use the results of this work in order to select the appropriate catalyst and get the desired products economically"--Abstract, page ii.


Liapis, Athanasios I.

Committee Member(s)

Crosser, Orrin K.
Lee, Ralph E., 1921-2010


Chemical and Biochemical Engineering

Degree Name

M.S. in Chemical Engineering


In Vita, author's name is given as Horng Dar-Sen; on title page as Dar-Sen Horng.


University of Missouri--Rolla

Publication Date

Summer 1985


xiii, 195 pages

Note about bibliography

Includes bibliographical references (pages 158-160).


© 1985 Dar-Sen Horng, All rights reserved.

Document Type

Thesis - Open Access

File Type




Subject Headings

Porous materials
Gas dynamics -- Mathematical models
Gas dynamics -- Computer simulation

Thesis Number

T 5227

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