rate of the overall process
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Solve (C) Part only
![3. Mechanism of catalytic reactions
One of the reactions that takes place in the catalytic converters of automobiles is the oxidation
of CO by NO over a copper catalyst. It converts the poisonous CO and NO (the latter is also a
reason for acid rains) to harmless CO2 and N2:
CO+ NO CO₂ + 2N₂.
The mechanism of the process is:
CO+S
NO+S
NOS+COS
149
COS,
NOS,
N³ +CO₂ +s,
(8-44)
(fast)
(fast)
(slow)
2NN₂ +2s.
(fast)
a) Identify the type of each of these processes (adsorption, desorption -dissociative or non-
dissociative? surface reaction - Langmuir, Hinshelwood-Langmuir or Eley-Rideal?).
b) Assume all processes 1-4 are simple. Assume also that the equilibria 1 and 2 are quickly
established. Finally, assume that reaction 3 is very slow, while reaction 4 is fast (that is, NS is a
reactive intermediate). Write the site balance for the surface of copper, but use the
approximation that in it is negligible (reactive intermediate means low concentration). These
assumptions lead to four equations for the four adsorptions (No, Ico, IN and I); write them
down, solve them.
c) Find the rate of the overall process (8-44), as an explicit function of CNO and Cco.
Experimentally, it was found that the process follows the experimentally determined rate law:
r = k[CO]/[NO].
How does that compare with your result? What if NO adsorbs very strongly on the surface of
copper (i.e. the adsorption constant K₂ is very large)?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F1119c4f8-cc7a-44bd-b507-c5da2ad85ee3%2F3486cd5d-4e25-44d0-9b11-41d04fe04ec5%2Fq19jd5l_processed.jpeg&w=3840&q=75)
Transcribed Image Text:3. Mechanism of catalytic reactions
One of the reactions that takes place in the catalytic converters of automobiles is the oxidation
of CO by NO over a copper catalyst. It converts the poisonous CO and NO (the latter is also a
reason for acid rains) to harmless CO2 and N2:
CO+ NO CO₂ + 2N₂.
The mechanism of the process is:
CO+S
NO+S
NOS+COS
149
COS,
NOS,
N³ +CO₂ +s,
(8-44)
(fast)
(fast)
(slow)
2NN₂ +2s.
(fast)
a) Identify the type of each of these processes (adsorption, desorption -dissociative or non-
dissociative? surface reaction - Langmuir, Hinshelwood-Langmuir or Eley-Rideal?).
b) Assume all processes 1-4 are simple. Assume also that the equilibria 1 and 2 are quickly
established. Finally, assume that reaction 3 is very slow, while reaction 4 is fast (that is, NS is a
reactive intermediate). Write the site balance for the surface of copper, but use the
approximation that in it is negligible (reactive intermediate means low concentration). These
assumptions lead to four equations for the four adsorptions (No, Ico, IN and I); write them
down, solve them.
c) Find the rate of the overall process (8-44), as an explicit function of CNO and Cco.
Experimentally, it was found that the process follows the experimentally determined rate law:
r = k[CO]/[NO].
How does that compare with your result? What if NO adsorbs very strongly on the surface of
copper (i.e. the adsorption constant K₂ is very large)?
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