Approximate model for diffusion and reaction in a Porous catalyst with mass-transfer resistances

AIChE Journal ◽  
2001 ◽  
Vol 47 (9) ◽  
pp. 2131-2135 ◽  
Author(s):  
Mirosław K. Szukiewicz
Keyword(s):  
Mass Transfer ◽  
Approximate Model ◽  
Porous Catalyst

Mass transfer in heterogeneous system enzyme-substrate; Approximate analytical model for the case of liquid substrate-immobilized enzyme

1982 ◽  
Vol 47 (11) ◽  
pp. 3013-3018
Author(s):  
František Kaštánek ◽  
Jindřich Zahradník ◽  
Germanico Ocampo
Keyword(s):  
Mass Transfer ◽  
Heterogeneous System ◽  
Immobilized Enzyme ◽  
Enzymatic Reaction ◽  
Analytical Form ◽  
Approximate Model ◽  
Basic Type ◽  
Reaction Interface ◽  
Enzyme Substrate ◽  
Flow Intensity

Calculation procedure is suggested for flow intensity of substrate toward reaction interface of immobilized enzyme at simultaneous effect of enzymatic reaction and internal diffusion. The approximate model is presented in an analytical form for the basic type of Michaelis-Menten kinetics and for the case of inhibition in excess of substrate.

scholarly journals Catalyst Particle Porosity Effect upon Flameless Combustion Characteristics

2020 ◽  
Vol 21 (1) ◽  
pp. 124-131
Author(s):  
V. V. Kalinchak ◽  
A. S. Chernenko ◽  
A. F. Fedorenko ◽  
A. N. Sofronkov ◽  
V. V. Kramarenko
Keyword(s):  
Mass Transfer ◽  
Spontaneous Combustion ◽  
Catalyst Particle ◽  
Order Reaction ◽  
Gas Mixture ◽  
Porous Catalyst ◽  
First Order ◽  
Inner Surface ◽  
Reaction Proceeds ◽  
Porosity Effect

The problem of heat and mass transfer of a porous catalyst particle is considered. On the her surface, including the inner surface of the pores, an irreversibly heterogeneous first-order reaction proceeds. It has been analytically shown that in a heated gas mixture, the catalyst's porosity reduces the minimum impurity's concentration of catalytic spontaneous combustion in the mixture and increases the catalyst particle's corresponding diameter. This concentration corresponds to the external kinetic and internal diffusion reaction's modes.

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