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ChE 553 Lecture 22

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Importance Of Catalysis. 90% of all chemical processes use catalystsChanges in catalysts have a giant influence on rates and selectivity's of reactions. More than anything elseMost real reactor design associated with optimizing performance of catalyst. 2. Catalysis Definition. Ostwald defined a

ChE 553 Lecture 22

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1. ChE 553 Lecture 22 Introduction To Catalysis 1

ChE 553 Lecture 2

ChE 553 Lecture 2 . Surface Notation. Objectives. Learn Notation To Describe the Structure Of Surfaces Bravis Lattices: BCC, FCC, HCP Miller Indicies: (111), (100), (110) Woods Notation: (2x2), (7x7). Introduction to Surface Structure.

1.02k views • 39 slides

ChE 553 Lecture 6

ChE 553 Lecture 6 . Equilibrium Adsorption. Objective. Introduce Adsorption Isotherms How much gas adsorbs at equilibrium as a function of pressure Qualitative features of isotherms Types 1-5 More complex phase behavior. Topics. Introduction to Adsorption Isotherms Five types

1.26k views • 33 slides

ChE 553 Lecture 3

ChE 553 Lecture 3 . Binding Of Molecules To Surfaces: 1. Objective. General Overview Of Binding Of Molecules To Metal Surfaces What are the key forces What are trends What are adsorbed layers like. Key Terms. Adsorbate Adsorbent.

415 views • 27 slides

ChE 553 Lecture 15

ChE 553 Lecture 15 . Catalytic Kinetics Continued. Object. Examine the effects of pairwise interactions on rates of surface reactions Interactions change apparent order Can fit to Langmuir, but with the wrong mechanism. Started Catalytic Kinetics Last Time.

461 views • 33 slides

ChE 553 Lecture 07

ChE 553 Lecture 07. Review Of Statistical Mechanics. Objective For Today. Go over some background statistical mechanics Define ensemble, partition function, . Historical Introduction. Maxwell. Stat mech developed by Maxwell, Boltzman, Clausius, Gibbs.

519 views • 32 slides

ChE 553 Lecture 1

ChE 553 Lecture 1. Surface Chemistry MWF 3 pm 113 Davemport (some meetings in 213 RAL). Faculty &amp; TA. Prof. Rich Masel, 213 RAL, r-masel@illinois.edu . Wei Zhu 294 RAL, werzhu2@illinois.edu. Overview of Today's Lecture. Background Course objectives Organization Requirements Grading.

352 views • 20 slides

ChE 553 Lecture 4

ChE 553 Lecture 4 . Models For Physisorption And Chemisorption I. Objective For Today. Quantify the results from lect 3 Forces that determine bonding Large trends Physical forces Electronegativity Hardness/density of states. Forces Between a Molecule and Metal Surface.

815 views • 35 slides

ChE 553 Lecture 25

ChE 553 Lecture 25. Theory Of Activation Barriers. Objective. Describe more quantitative models of activation barriers Marcus Blowers-Masel Show one can get reasonable estimates of activation barriers. Review: Barriers To Reaction Are Caused By. Uphill reactions

513 views • 36 slides

ChE 553 Lecture 21

ChE 553 Lecture 21. Estimating Activation Barriers On Metal Surfaces. Objective. Learn how to estimate heats of reaction for reactions on surfaces Learn how to estimate activation barriers for reactions on surfaces. Example CH 3 OH CO+2H 2.

304 views • 19 slides

ChE 553 Lecture 13

ChE 553 Lecture 13. Introduction To Surface Reactions. Objective. Start To Discuss Surface Reactions Overview of mechanism Typical reactions on metals Highlight well studied examples Qualitative trends with changing composition and structure. Topics. General Mechanisms Of Surface

547 views • 34 slides

ChE 553 Lecture 29

ChE 553 Lecture 29. Catalysis By Metals. Objective. Apply what we have learned to reactions on metal surfaces. Metals Work By Same Mechanisms As Other Catalysts. Metal catalysts can help initiate reactions Metal catalysts can stabilize the intermediates of a reaction

512 views • 31 slides

ChE 452 Lecture 22

ChE 452 Lecture 22. Transition State Theory. Conventional Transition State Theory (CTST). TST Model motion over a barrier Use stat mech to estimate key terms. Motion Over PE Surface.

501 views • 35 slides

ChE 553 Lecture 16

ChE 553 Lecture 16. Mechanisms Of Surface Reactions. Objective. Start to talk about mechanisms of reactions on solid surfaces. Mechanisms Of Reactions On Surfaces. Generally surface reactions follow catalytic cycle with adsorption, reaction, desorption Form adsorbed radicals Radicals react

421 views • 22 slides

ChE 553 Lecture 3

ChE 553 Lecture 3. Binding Of Molecules To Surfaces: 1. Objective. General Overview Of Binding Of Molecules To Metal Surfaces What are the key forces What are trends What are adsorbed layers like. Key Terms. Adsorbate Adsorbent.

468 views • 27 slides

ChE 452 Lecture 02

ChE 452 Lecture 02. Basic Concepts. Stoichiometry. Invented by Lavoisier Molecules react in fixed proportions  1 A +  2 B   3 C+  4 D Stoichiometric Coefficent,  n Number of molecules produced when reaction goes once. Example. 2CO + O 2  2CO 2 CO + ½ O 2  CO 2. Answer.

389 views • 28 slides

ChE 553 Lecture 19

ChE 553 Lecture 19. Mechanisms Continued. The Idea Of Computing A Mechanism. Today. More complex reactions When does the method fall. More Complex Reactions. Same process works Need additional reactions Need additional and  - Betas Need additional rules. Additional Reactions.

472 views • 31 slides

ChE 553 Lecture 14

ChE 553 Lecture 14. Catalytic Kinetics. Objective. Provide an overview of catalytic kinetics How do rates vary with concentration Simple modles: langmuir. Key Ideas For Today. Generic mechanisms of catalytic reactions Measure rate as a turnover number Rate equations complex

558 views • 32 slides

ChE 553 Lecture 9

ChE 553 Lecture 9. Statistical Mechanics Of Adsorption. Objective. Start to discuss thermodynamics of surface phase transitions Landau analysis – what phases do we see Solve one dimensional surface – what is phase behavior like. Background.

386 views • 28 slides

ChE 452 Lecture 23

ChE 452 Lecture 23. Transition State Theory, Continued. Last Time Transition State Theory. Also called conventional transition state theory (CTST). (7.43). Results From Last Time. F+H 2 HF+H. Comparison Of Transition State Theory And Collision Theory.

470 views • 26 slides

ChE 553 Lecture 8

ChE 553 Lecture 8. Review Of Statistical Mechanics Continued. Objective. Review how to calculate the partition function for a molecule Calculate the partition function for adsorption on a surface Use result to derive Langmuir Adsorption Isotherm.

433 views • 39 slides

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