Lecture

Internal Mass Transfer Limitations

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In course

ChE-403: Heterogeneous reaction engineering

The theoretical background and practical aspects of heterogeneous reactions including the basic knowledge of heterogeneous catalysis are introduced. The fundamentals are given to allow the design of multiphase chemical reactors. ...

Description

This lecture discusses the calculation of observed rates in the presence of internal mass transfer limitations, emphasizing the concentration in the entire pellet. Equations for steady-state processes and flux entering the pellet are analyzed for different reaction orders and particle geometries.

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Instructors (2)

Albert Renken

Teaching & PhD Past EPFL PhD Students Serge Maeder, Jacques Membrez, Stéphane Porchet, Philippe Menoud, Brigitta Frank, Harvey Randall, Wolfgang Zimmerer, Frédéric Van Vyve, Serge Golay, Jianzhong Yang, Stéphane Dubuis, Philippe Warnery, Anders Nattorp, Christian Spühler, Laurent Cavin, Miriam Lorenzi, Bastien Monnerat, André Rouge, Olivier Wolfrath, Peter Stahl, Ralf Maurer, Konrad Geissler, Volker Höller, Benoît Louis, Pierre Reuse, Fabio Rainone, Eric Joannet, Chrystèle Horny Past EPFL PhD Students as co

Jeremy Luterbacher

Expertise Biomass conversion Heterogeneous catalysis See: https://www.epfl.ch/labs/lpdc/luterbacher/ Education Postdoc | Chemical Engineering 2014 – 2014 Univsersity of Wisconsin-Madison PhD | Chemical Engineering 2012 – 2012 Cornell University Master | Chemical Engineering 2010 – 2010 Cornell University Master | Chemical Engineering 2007 – 2007 ï¿½cole Polytechnique Fï¿½dï¿½rale de Lausanne Bachelor | Chemistry and Ch

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Related concepts (32)

Molar concentration

Molar concentration (also called molarity, amount concentration or substance concentration) is a measure of the concentration of a chemical species, in particular of a solute in a solution, in terms of amount of substance per unit volume of solution. In chemistry, the most commonly used unit for molarity is the number of moles per liter, having the unit symbol mol/L or mol/dm3 in SI unit. A solution with a concentration of 1 mol/L is said to be 1 molar, commonly designated as 1 M.

Rate-determining step

In chemical kinetics, the overall rate of a reaction is often approximately determined by the slowest step, known as the rate-determining step (RDS or RD-step or r/d step) or rate-limiting step. For a given reaction mechanism, the prediction of the corresponding rate equation (for comparison with the experimental rate law) is often simplified by using this approximation of the rate-determining step. In principle, the time evolution of the reactant and product concentrations can be determined from the set of simultaneous rate equations for the individual steps of the mechanism, one for each step.

Chemical reaction

A chemical reaction is a process that leads to the chemical transformation of one set of chemical substances to another. Classically, chemical reactions encompass changes that only involve the positions of electrons in the forming and breaking of chemical bonds between atoms, with no change to the nuclei (no change to the elements present), and can often be described by a chemical equation. Nuclear chemistry is a sub-discipline of chemistry that involves the chemical reactions of unstable and radioactive elements where both electronic and nuclear changes can occur.

Reaction mechanism

In chemistry, a reaction mechanism is the step by step sequence of elementary reactions by which overall chemical reaction occurs. A chemical mechanism is a theoretical conjecture that tries to describe in detail what takes place at each stage of an overall chemical reaction. The detailed steps of a reaction are not observable in most cases. The conjectured mechanism is chosen because it is thermodynamically feasible and has experimental support in isolated intermediates (see next section) or other quantitative and qualitative characteristics of the reaction.

Chemical kinetics

Chemical kinetics, also known as reaction kinetics, is the branch of physical chemistry that is concerned with understanding the rates of chemical reactions. It is different from chemical thermodynamics, which deals with the direction in which a reaction occurs but in itself tells nothing about its rate. Chemical kinetics includes investigations of how experimental conditions influence the speed of a chemical reaction and yield information about the reaction's mechanism and transition states, as well as the construction of mathematical models that also can describe the characteristics of a chemical reaction.

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