Chemical Reaction Engineering PowerPoint Presentation

Chemical Reaction Engineering PowerPoint Presentation

2018-02-05 42K 42 0 0

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(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. ID: 628278

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Presentations text content in Chemical Reaction Engineering

Slide1

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

Slide2

Today’s lecture

Interstage

Cooling

Noble Prize 2007Catalytic Steps

2

Slide3

3

Slide4

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.

4

Slide5

Catalysts affect both Selectivity and Yield

Different reaction Paths

5

Slide6

Different shapes and

sizes

of

catalyst.

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Slide7

Catalytic packed-bed

reactor

, schematic.

7

Slide8

Steps in a Catalytic Reaction

8

Slide9

Active SiteReactions 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.

9

Slide10

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

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Slide11

Adsorption

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Slide12

More Catalysis

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Slide13

Langmuir Adsorption Isotherm

Increasing T

Slope=k

A

More Catalysis

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Slide14

The Surface Reaction Step

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Slide15

The Surface Reaction Step

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Slide16

The Surface Reaction Step

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Slide17

The Surface Reaction Step

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Slide18

The Surface Reaction Step

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Slide19

Desorption from surface

Vacant and occupied sites

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Slide20

Steps in a Catalytic Reaction

Adsorption on Surface

Surface Reaction

Single Site

Dual Site

Desorption from Surface

20

Slide21

The Rate Limiting Step:Which Step Has the Largest Resistance?

Electrical analog to heterogeneous reactions

21

Slide22

Collecting information for catalytic reactor design

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Slide23

Octane NumbersCatalytic Reforming

Normal Pentane Octane Number = 62

Iso

-Pentane Octane Number = 95

23

Slide24

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Slide25

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Slide26

Steps in a Catalytic Reaction

Adsorption on Surface

Surface Reaction

Single Site

Dual Site

Desorption from Surface

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Slide27

Steps in a Catalytic Reaction

Adsorption on Surface

Surface

Reaction

Dual

Site

27

Slide28

Steps in a Catalytic Reaction

Surface Reaction Eley-Rideal

Desorption

form Surface

28

Slide29

End of Lecture 23

29


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