Chemical Reaction Engineering (CRE) is the field that studies the rates and mechanisms of chemical reactions and the design of the reactors in which they.

Slides:

Advertisements

Similar presentations

CI 10.4 What is a catalyst?. Catalysts Speed up the rate of a chemical reaction Are not chemically changed or used up in the reaction May be specific.

Advertisements

Heterogeneous Catalysis & Solid State Physics Dohyung Kim May 2, 2013 Physics 141A.

Mr. Azizullah Fazaia Degree college, Peshawar. To teach the students the chemical processes which takes place in the presence of a catalyst.

Break  Link between Thermodynamics and Kinetics.

CATALYSIS AND CATALYTIC REACTION MECHANISM PART 1

Reactor Design. الولد اللي بيقوم بدور الأول : ياترى يا باشمهندسة هناخد إيه النهاردة؟ أنا : هناخد أول سكشن catalysis إن شاء الله الولد اللي بيقوم بدور.

Adsorption and Catalysis Dr. King Lun Yeung Department of Chemical Engineering Hong Kong University of Science and Technology CENG 511 Lecture 3.

“ !” completely different mechanisms. catalysis: the process by which a catalyst changes the rate and mechanism of a chemical reaction -- a catalyst is…

Lecture 17 Chemical Reaction Engineering (CRE) is the field that studies the rates and mechanisms of chemical reactions and the design of the reactors.

Lecture 23 Thursday 4/1/08 OCNB Explosion Noble Prize 2007 Catalytic Steps.

INTRODUCTION TO CATALYSIS –KINETICS OF CATALYTIC REACTIONS CH

Unit 7 Notes Part 1 Chemical Kinetics The area of chemistry concerned with the speed at which reactions occur is called chemical kinetics. – Reaction.

88 ITK-329 Kinetika & Katalisis Introduction to Catalyst & Catalysis Dicky Dermawan Chapter 5.

Heterogeneous catalysis

Copyright©2000 by Houghton Mifflin Company. All rights reserved. 1 Chemical Kinetics The area of chemistry that concerns reaction rates.

Chemical Reaction Engineering (CRE) is the field that studies the rates and mechanisms of chemical reactions and the design of the reactors in which they.

Batch Stoichiometric Table SpeciesSymbolInitialChangeRemaining DD ________ ____________ CC B B A A InertI where and.

Lecture Thursday 4/3/08 Normal Pentene  Iso-Pentane Langmuir Adsorption Isotherm Catalytic Converters for Automobiles.

Chemical Reaction Engineering (CRE) is the field that studies the rates and mechanisms of chemical reactions and the design of the reactors in which they.

Lecture 24 Chemical Reaction Engineering (CRE) is the field that studies the rates and mechanisms of chemical reactions and the design of the reactors.

ChE 553 Lecture 23 Catalysis By Surfaces 1. Objective For Today Ask How Surfaces Can Catalyze Reactions 2.

Chemical Reaction Engineering (CRE) is the field that studies the rates and mechanisms of chemical reactions and the design of the reactors in which they.

Chemical Reaction Engineering (CRE) is the field that studies the rates and mechanisms of chemical reactions and the design of the reactors in which they.

Chemistry. Surface Chemistry - 1 Session Session Objectives  Adsorption versus absorption  Types of adsorption: physisorption and chemisorption  Desorption.

All about catalysts. Catalysts are substances that increase the rate of a chemical reaction by reducing the activation energy, but which is left unchanged.

1 Data Update Transesterification of triglyceride with methanol at different temperatures Shuli Yan

Chemical Reaction Engineering (CRE) is the field that studies the rates and mechanisms of chemical reactions and the design of the reactors in which they.

L17-1 Slides courtesy of Prof M L Kraft, Chemical & Biomolecular Engr Dept, University of Illinois, Urbana-Champaign. Review: Unsteady State Nonisothermal.

Chemical Kinetics The area of chemistry that concerns reaction rates and reaction mechanisms.

Copyright©2000 by Houghton Mifflin Company. All rights reserved. 1 Chemical Kinetics The area of chemistry that concerns reaction rates.

Catalysis October Catalyst A substance that speeds up a reaction without being consumed itself How? By providing a new pathway for the reaction,

Mechanisms Of Surface Reactions

Catalysis Catalyst: A substance that speeds up a reaction without being consumed Enzyme: A large molecule (usually a protein) that catalyzes biological.

Molecular Biology.  Enzymes are globular proteins that work as catalysts  Catalysts speed up chemical reactions without being altered themselves  Enzymes.

Chemistry 1011 Slot 51 Chemistry 1011 TOPIC Rate of Reaction TEXT REFERENCE Masterton and Hurley Chapter 11.

Chemistry of Life Biology chapter 2.4. Enzymes (Proteins)  Enzymes are proteins that act as catalysts in nearly all metabolic processes (essential for.

Catalysts. Things that Effect Rate l Catalysts- substances that speed up a reaction without being used up.(enzyme). l Speeds up reaction by giving the.

Rates of Reactions – Part 2. Factors affecting the rate of reaction The surface area The concentration of the reactant The temperature at which the reaction.

S OLID S TATE AND S URFACE C HEMISTRY ( LECTURE 10) Dr. Saeda Rwede Al-Mhyawi Assistant professor in physical chemistry Contact Info:

IC-1/38 Lecture Kinetics IC-2/38 Lecture What is Kinetics ? Analysis of reaction mechanisms on the molecular scale Derivation.

ChE 553 Lecture 14 Catalytic Kinetics 1. Objective Provide an overview of catalytic kinetics –How do rates vary with concentration –Simple modles: langmuir.

ChE 553 Lecture 30 Catalysis By Metals 1. Objective Examine the trends in bonding over the periodic table 2.

ERT 208/4 REACTION ENGINEERING: Catalysis & Catalytic Reaction Mechanism Part A: Heterogeneous Reaction By; Mrs Haf iza Bint i Shu kor ERT 208/4 REACTION.

Chapter 13: Reaction Rate

ERT 208/4 REACTION ENGINEERING:

Lecture 18 Chemical Reaction Engineering (CRE) is the field that studies the rates and mechanisms of chemical reactions and the design of the reactors.

Lecture 23 Chemical Reaction Engineering (CRE) is the field that studies the rates and mechanisms of chemical reactions and the design of the reactors.

ANSWER SCHEME ASSIGNMENT 4

Catalysis Catalyst: A substance that speeds up a reaction without being consumed Enzyme: A large molecule (usually a protein) that catalyzes biological.

Steps in a Heterogeneous Catalytic Reaction

Catalysis Catalyst: A substance that speeds up a reaction without being consumed Enzyme: A large molecule (usually a protein) that catalyzes biological.

Chemical Reaction Engineering Asynchronous Video Series

Reaction Mechanism The reaction mechanism is the series of elementary steps by which a chemical reaction occurs. The sum of the elementary steps must give.

Rates of Reactions Lesson 13.

Factors Effecting Reaction Rate

Catalysis and Heterogeneous Catalysis

Sec 2.3 Chemical Reactions and Enzymes

Catalysis A catalyst is a substance that increases the rate of a reaction without being consumed in the reaction.

Catalysts May SCH4U1.

Identify and Investigate the role of enzymes.

Reaction Mechanism Most chemical reactions occur by a series of elementary steps. An intermediate is formed in one step and used up in a subsequent step.

CH EN 5253 – Process Design II Effects of Impurities on Reactions and Reactor Design February 11, 2019.

CI 10.4 What is a catalyst?.

catalysis: the process by which a catalyst changes the

Catalysis Catalyst: A substance that speeds up a reaction without being consumed Enzyme: A large molecule (usually a protein) that catalyzes biological.

Presentation transcript:

Chemical Reaction Engineering (CRE) is the field that studies the rates and mechanisms of chemical reactions and the design of the reactors in which they take place. Lecture 23

Today’s lecture Interstage Cooling Noble Prize 2007 Catalytic Steps 2

Catalysts and Catalysis A Catalyst is a substance that affects the rate of chemical reaction but emerges from the process unchanged. Catalysis is the occurrence, study, and use of catalysts and catalytic processes. Approximately 1/3 of the GNP of materials produced in the U.S. involves a catalytic process. 3

Catalysts affect both Selectivity and Yield Different reaction Paths 4

Different shapes and sizes of catalyst. 5

Catalytic packed-bed reactor, schematic. 6

Steps in a Catalytic Reaction 7

Active Site Reactions are not catalyzed over the entire surface but only at certain active sites or centers that result from unsaturated atoms in the surface. An active site is a point on the surface that can form strong chemical bonds with an adsorbed atom or molecule. 8

The Adsorption Step Vacant and occupied sites For the system shown, the total concentration of sites is C t = C v + C A.S + C B.S 9

Adsorption 10

More Catalysis 11

Langmuir Adsorption Isotherm Increasing T Slope=k A More Catalysis 12

The Surface Reaction Step 13

The Surface Reaction Step 14

The Surface Reaction Step 15

The Surface Reaction Step 16

The Surface Reaction Step 17

Desorption from surface Vacant and occupied sites 18

Steps in a Catalytic Reaction Adsorption on Surface Surface Reaction Single Site Dual Site Desorption from Surface 19

The Rate Limiting Step: Which Step Has the Largest Resistance? Electrical analog to heterogeneous reactions 20

Collecting information for catalytic reactor design 21

Octane Numbers Catalytic Reforming Normal Pentane Octane Number = 62 Iso-Pentane Octane Number = 95 22

23

Steps in a Catalytic Reaction Adsorption on Surface Surface Reaction Single Site Dual Site Desorption from Surface 24

Steps in a Catalytic Reaction Adsorption on Surface Surface ReactionDual Site 25

Steps in a Catalytic Reaction Surface Reaction Eley-Rideal Desorption form Surface 26

End of Lecture 23 27