Lecture

Bifunctional Catalysis: Surface Reaction Mechanisms

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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 delves into the intricacies of bifunctional catalysis, focusing on surface reaction mechanisms and kinetic parameters evaluation. The instructor explains the importance of considering elementary steps and proposes a sequence for studying a reaction. The lecture emphasizes the significance of equilibrium expressions and the role of rate-determining steps in catalytic reactions. Various kinetic parameters are evaluated, and the lecture concludes with a cautionary note on data fitting and the need to verify thermodynamic values. The content covers the hydrogenation of propanal over a supported nickel catalyst, highlighting the inhibitory effect of hydrogen on the reaction rate.

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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

Official source

Ontological neighbourhood

Chemistry

Physical chemistry: Chemical kinetics

Energy engineering

Nuclear power: Topics in nuclear power

Related concepts (32)

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.

Reaction rate

The reaction rate or rate of reaction is the speed at which a chemical reaction takes place, defined as proportional to the increase in the concentration of a product per unit time and to the decrease in the concentration of a reactant per unit time. Reaction rates can vary dramatically. For example, the oxidative rusting of iron under Earth's atmosphere is a slow reaction that can take many years, but the combustion of cellulose in a fire is a reaction that takes place in fractions of a second.

Surface tension

Surface tension is the tendency of liquid surfaces at rest to shrink into the minimum surface area possible. Surface tension is what allows objects with a higher density than water such as razor blades and insects (e.g. water striders) to float on a water surface without becoming even partly submerged. At liquid–air interfaces, surface tension results from the greater attraction of liquid molecules to each other (due to cohesion) than to the molecules in the air (due to adhesion). There are two primary mechanisms in play.

Surface

A surface, as the term is most generally used, is the outermost or uppermost layer of a physical object or space. It is the portion or region of the object that can first be perceived by an observer using the senses of sight and touch, and is the portion with which other materials first interact. The surface of an object is more than "a mere geometric solid", but is "filled with, spread over by, or suffused with perceivable qualities such as color and warmth".

Evidence-based policy

Evidence-based policy is a concept in public policy that advocates for policy decisions to be grounded on, or influenced by, rigorously established objective evidence. This concept presents a stark contrast to policymaking predicated on ideology, 'common sense,' anecdotes, or personal intuitions. The approach mirrors the effective altruism movement's philosophy within governmental circles. The methodology employed in evidence-based policy often includes comprehensive research methods such as randomized controlled trials (RCT).

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