期刊
CHEMICAL ENGINEERING SCIENCE
卷 59, 期 20, 页码 4361-4368出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ces.2004.06.033
关键词
reactant starvation; equilibrium; fluid-solid reactions; heterogeneous reactions; kinetics; mass transfer; pore diffusion; equilibrium-limited
The purpose of this article is to analyze critically and quantitatively the effect of fluid reactant supply rates and mass transfer on the measurement of the rates of fluid-solid reactions, particularly those with small equilibrium constants. It is shown through a mathematical analysis that the measurement of the intrinsic kinetics of a reaction with a small equilibrium constant (a positive standard free energy of reaction) requires much larger rates of fluid reactant supply and mass transfer rates than that of a reaction with a large equilibrium constant. The overall reaction rate of the former also tends to be slow. Furthermore, the apparent activation energy of such a reaction approaches the standard enthalpy of reaction (DeltaH(0)), rather than the true activation energy of the chemical reaction. (C) 2004 Elsevier Ltd. All rights reserved.
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