© 1999 Prentice-Hall PTR Prentice Hall, Inc. ISBN 0-13-531708-8
CRE -- Chapter Ten-Objectives
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10
Catalysis and Catalytic Reactors
After completing Chapter 10 of the text and associated CD-ROM material the reader will be able to:
Define a catalyst, a
catalytic mechanism and a rate limit step.
Describe the steps in a catalytic mechanism and how one goes about deriving a rate law and a mechanism and rate
limiting step consistent with the experimental data. Size isothermal reactors for reactions with Langmuir- Hinschelwood kinetics. Discuss the different types of catalyst deactivation and the reactor types and describe schemes that can help offset the deactivation. Analyze catalyst decay and conversion for CSTRs and PFRs with temperature- time trajectories, moving bed reactors, and straight through transport reactors. Describe the steps in Chemical Vapor Deposition(CVD). Analyze moving bed reactors that are not operated isothermally.
CRE -- Chapter Ten-Objectives
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© 1999 Prentice-Hall PTR Prentice Hall, Inc. ISBN 0-13-531708-8 Legal Statement
CRE -- Chapter Ten
file:///H:/html/10chap/html/ten.htm[05/12/2011 16:54:50]
10
Learning Resources
1. Summary Notes for Lectures 19 and 20 Summary Notes for Lectures 21 and 22 Summary Notes for Lectures 23 and 24
3. Interactive Computer Module A. Heterogeneous Catalysis
4. Solved Problems
A. Example CD10-1 Analysis of Heterogeneous Data [Class Problem, Winter 1997]
B. Example CD10-2 Least-Squares to Determine Rate Law Parameters k, KT, and KB (Example 6-2 in 2nd Edition)
C. Example CD10-3 Hydrodemethylation of Toluene in a PBR without Pressure Drop [2nd Ed. Example 6-3]
D. Example CD10-4 Cracking of Texas Gas-Oil in a STTR [2nd Ed. Example 6-5]
Living Example Problems
The following examples can be accessed through the Software Toolbox. 1. Example 10-5 Catalyst Decay in a Fluidized Bed Modeled as a CSTR 2. Example 10-6 Catalytic Cracking in a Moving-Bed Reactor
3. Example 10-7 Decay in a Straight Through Transport Reactor
Professional Reference Shelf 1. Hydrogen Adsorption
A. Molecular Adsorption B. Dissociative Adsorption
2. Catalyst Poisoning in a Constant Volume Batch Reactor
3. Differential Method of Analysis to Determine the Decay Law
4. Etching of Semiconductors
A. Dry Etching B. Wet Etching
CRE -- Chapter Ten
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C. Dissolution Catalysis
Additional Homework Problems
CDP10-AA
Suggest a rate law and mechanism for the catalytic oxidation of ethanol over tantalum oxide when the adsorption of ethanol and oxygen takes place on different sites. [2nd Ed. P6-17]
CDP10-BB
Analyze the data for the vapor-phase esterification of acetic acid over a resin catalyst at 118 C.
CDP10-CB
Silicon dioxide is grown by CVD according to the reaction
SiH2Cl2(g) + 2N20(g) SiO2(s) + 2N2(g) + 2HCL(g)
Use the rate data to determine the rate law, reaction mechanism, and rate law parameters. [2nd Ed. P6-13]
CDP10-DB
The autocatalytic reaction A + B 2B is carried out in a moving-bed reactor. The decay law is first- order in B. Plot the activity and the concentrations of A and B as a function of catalyst weight.
CDP10-EB
Determine the rate law and rate law parameters for the wet etching of an aluminum silicate.
CDP10-FB
Titanium films are used in decorative coatings as well as wear-resistant tools because of their thermal stability and low electrical resistivity. TiN is produced by CVD from a mixture of TiCl4 and NH3TiN. Develop a rate law, a mechanism, and a rate-limiting step, and evaluate the rate law parameters.
CDP10-GC
The decomposition of cumene is carried out over a LaY zeolite catalyst, and deactiviation is found to occur by coking. Determine the decay law and rate law, and use these to design a STTR. [2nd Ed. P6-27]
CDP10-HB
The dehydrogenation of ethylbenzene is carried out over a Shell catalyst. From the data provided, find the cost of the catalyst required to produce a specified amount of styrene. [2nd Ed. P6-20]
CDP10-IB
A second-order reaction over a decaying catalyst takes place in a moving-bed reactor. [Final Exam, Winter 1994]
CDP10-JB
A first-order reaction A B + C takes place in a moving-bed reactor.
CDP10-KB
For the cracking of normal paraffins (Pn), the rate has been found to increase with increasing temperature up to a carbon number of 15 (i.e., n < 16) and to decrease with increasing temperature for a carbon number greater than 16. [J. Wei, Chem. Eng. Sci., 51, 2995 (1996)]
CRE -- Chapter Ten
file:///H:/html/10chap/html/ten.htm[05/12/2011 16:54:50] CDP10-LB
The formation of CH4 from CO and H2 is studied in a differential reactor.
CDP10-MB
The reaction A + B C + D is carried out in a moving-bed reactor.
CDP10-NA
Determine the rate law and mechanism for the reaction A + B C.
CDP10-OB
Determine the rate law from data where the pressures are varied in such a way that the rate is constant. [2nd Ed. P6-18]
CDP10-PB
Determine the rate law and mechanism for the vapor phase dehydration of ethanol. [2nd Ed. P6-21]
CDP10-QA
Second order reaction and zero order decay in a batch reactor.
CDP10-RB
First order decay in a moving bed reactor for the series reaction
A B C
© 1999 Prentice-Hall PTR Prentice Hall, Inc. ISBN 0-13-531708-8
CRE -- Chapter Eleven-Objectives
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11
External Diffusion Effects on Heterogeneous Reactions
After completing Chapter 11 of the text and associated CD-ROM material the reader will be able to:
Define the mass transfer coefficient, explain what it is function of and how it is measured or calculated. Analyze PBRs in which mass transfer limits the rate of reaction.
Discuss how one goes form a region mass transfer limitation to reaction limitation.
Describe how catalyst monoliths and wire gauze reactors are analyzed. Apply the shrinking core model to analyze catalyst regeneration.
BEGIN
© 1999 Prentice-Hall PTR Prentice Hall, Inc. ISBN 0-13-531708-8 Legal Statement
CRE -- Chapter Eleven
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11
Learning Resources
1. Summary Notes for Lectures 27 and 28
2. Solved Problems
A. Example CD11-1 Calculating Steady State Fluxes B. Example CD11-2 Relating the Fluxes WA, BA, and JA C. Example CD11-3 Diffusion Through a Stagnant Gas
Professional Reference Shelf
1. Mass Transfer Limited Reactions on Metallic Surfaces
A. Catalyst Monoliths (Catalytic Converter for Autos) B. Wire Gauzes
Additional Homework Problems
CDP11-AA
An isomerization reaction that follows Langmuir-Hinshelwood kinetics is carried out on a monolith catalyst. [2nd Ed. P10-11]
CDP11-BB
A parameter sensitivity analysis is required for this problem in which an isomerization is carried out over a 20-mesh gauze screen. [2nd Ed. P10-12]
CDP11-CC
This problem examines the effect on temperature in a catalyst monolith. [2nd Ed. P10-13]
CDP11-DB
A second-order catalytic reaction is carried out in a catalyst monolith. [2nd Ed. P10-14]
CDP11-EC
Fracture acidizing is a technique to increase the productivity of oil wells. Here acid is injected at high pressures to fracture the rock and form a channel that extends out from the well bore. As the acid flows through the channel, it etches the sides of the channel to make it larger, and thus less resistant to the flow of oil. Derive equations for the concentration profile of acid and the channel width, each as a function of distance from the well bore. [2nd Ed. P10-15]
CDP11-FC
CRE -- Chapter Eleven
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2
oxidation occurs at the Si-SiO2 interface. Derive an equation for the thickness of the SiO2 layer as a fucntion of time. [2nd Ed. P10-17]
CDP11-GB
Mass transfer limitations in CVD processing to product material with ferroelectric and pezoelectric properties. [2nd Ed. P10-17]
CDP11-HB
Calculate multicomponent properties. [2nd Ed. P10-17]
CDP11-IB
Application of the shrinking core model to FeS2 rock samples in acid mine drainage. [2nd Ed. P10-18]
© 1999 Prentice-Hall PTR Prentice Hall, Inc. ISBN 0-13-531708-8
CRE -- Chapter Twelve-Objectives
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12
Diffusion and Reaction in Porous Catalysts
After completing Chapter 12 of the text and associated CD-ROM material the reader will be able to:
Define the Thiele modules and the effectiveness factor. Describe the regions of reaction limitations and internal diffusion limitations and the
conditions that affect them. Determine which resistance is controlling in a slurry reactor.
Analyze trickle bed reactors.
Analyze fluidized bed reactors.
Describe the operation of a CVD Boat Reactor.
BEGIN
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CRE -- Chapter Twelve
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