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Lecture 8Kjemisk reaksjonsteknikk

Chemical Reaction Engineering

Review of previous lectures Langmuir-Hinshelwood/Hougen-Watson models (LHHW) Apparent reactor order and activation energy

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Elements of Chemical Reaction Engineering (3rd Edition)

1. Week 34, Aug. 21, chapter 1, Introduction, mole balance, and ideal reactors

2. Week 34, Aug. 23, chapter2, Conversion and reactor size3. Week 35, Aug. 28, chapter 3, Reaction rates4. Week 35, Aug. 30, chapter 3, Stoichometric numbers5. Week 36, Sept. 4, chapter 4.1-2, isothermal reactor design (1)6. Week 36, Sept. 6, chapter 4.3 isothermal reactor design (2)7. Week 37, Sept. 11, chapter 10.1-2 catalysis and kinetics (1)8. Week 37, Sept. 13, chapter 10. 3 catalysis and kinetics (2)9. Week 38, Sept. 18, chapter 7.1-4 catalysis and kinetics (2)10.Week 38, Sept. 20, chapter 5, kinetic modeling (1)11.Week 39, Sept. 25, chapter 5,10.5, kinetic modeling (2)12.Week 39, Sept. 28 chapter 6, multiple reactions (1)13.Week 40, Oct. 2, chapter 6 multiple reactions (2)14.Week 40, Oct. 4, summary of chapter 1-7, and 10, 4.4

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Elements of Chemical Reaction Engineering (3rd Edition)

1. Week 34, Aug. 21, chapter 1, Introduction, mole balance, and ideal reactors

2. Week 34, Aug. 23, chapter2, Conversion and reactor size3. Week 35, Aug. 28, chapter 3, Reaction rates4. Week 35, Aug. 30, chapter 3, Stoichometric numbers5. Week 36, Sept. 4, chapter 4.1-4, isothermal reactor design (1)6. Week 36, Sept. 6, chapter 4.5 isothermal reactor design (2)7. Week 37, Sept. 11, chapter 10.1-2 catalysis and kinetics (1)8. Week 37, Sept. 13, chapter 10. 3 catalysis and kinetics (2)9. Week 38, Sept. 18, chapter 7.1-3 catalysis and kinetics (2)10.Week 38, Sept. 20, chapter 5, kinetic modeling (1)11.Week 39, Sept. 25, chapter 5,10.4, kinetic modeling (2)12.Week 39, Sept. 28 chapter 6, multiple reactions (1)13.Week 40, Oct. 2, chapter 6 multiple reactions (2)14.Week 40, Oct. 4, summary of chapter 1-7, and 10, 4.5

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Reactor design equation

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Role of catalyst?

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Rate expression

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Simple example: reversible reactionA B

k1/k-1

k2/k-2

k3/k-3

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Other rate determining steps

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Thermodynamics

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Langmuir adsorption

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Multicomponent adsorption / inhibition

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Langmuir adsorption model

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Initial rate expressions

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More than one reactant

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Langmuir-Hinshelwood/Hougen-Watson models (LHHW)

Olaf Andreas Hougen

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What about observed: reaction orderactivation energy ?

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Rate of reaction, Activation Energy, Order of Reaction

Depends strongly on the site coverage

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Reaction order - Activation energy

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Limiting cases - forward rates

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Limiting cases - forward rates

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Limiting cases - forward rates

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Apparent activation energies N2O decomposition CO/ N2O = 2

Kapteijn et al. 11th ICC,1996

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Reaction kinetics, summary