06-Lect-The Rate Constant0

06-Lect-The Rate Constant0 - Outline: 1. The Rate Constant...

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1 Chemical Reaction Engineering - Musgrave The Rate Constant Lecture 6 - Page 1 Outline: 1. The Rate Constant (Fogler 3.3) 2. Updates to Our Approach to Reactor Sizing (Fogler 3.4) Next Time: (Fogler 3.5-3.6) 1. Stoichiometry and Batch Reactors (Fogler 3.5) 2. Stoichiometry and Flow Reactors(Fogler 3.6) Chemical Reaction Engineering - Musgrave The Rate Constant Lecture 6 - Page 2 Energy Intermediate Reactants Products Transition state Transition state MEP Minimum energy paths connect minima and pass through saddle points called the transition states Energy is a function of the relative positions of the atoms. The reaction coordinate is a distance along the MEP that shows the progress of the rxn. Transition state: a maximum on a MEP that occurs at structures intermediate between minima. First-order saddle-point.
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2 Chemical Reaction Engineering - Musgrave The Rate Constant Lecture 6 - Page 3 Consider the reaction: with the PES like that shown on the right: AB + C + BC A R AB R BC Minimum energy paths connect minima and pass through a saddle point called the transition state A B C The plot of the energy along the MEP might look like: Reactants Products E A E Δ H rxn Transition state What determines the rate of reaction? Chemical Reaction Engineering - Musgrave The Rate Constant Lecture 6 - Page 4 Reactants Products E A E Rate of Reaction Δ H rxn P(E) Transition state Probability A has energy E Fraction of N A that has sufficient energy to surmount barrier E A The probability A has energy E is given by a Distribution Function . In cases of molecular mixtures, this is a Maxwell Boltzmann Distribution
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06-Lect-The Rate Constant0 - Outline: 1. The Rate Constant...

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