1. Consider the following reaction - Dehydrogenation of Methyl Cyclohexane (MCH) to Toluene (TOL) using a Precious Metal (PI) supported on Alumina CH3 CH + 3H2 2 Typically, hydrogenation of a cyclo-alkane, like MCH, occurs in 3 or more stages, where one bond is dehydrogenated per stage, eventually resulting in the dehydrogenation of 3 bonds. Strong adsorption of MCH is likely to occur, but the adsorption of hydrogen (either as a molecule on a single site OR as an atom on a single site) is unclear. Therefore, in this question, two types of reaction mechanisms are to be considered, as discussed below. (a) You are to first propose a reaction mechanism which includes adsorption, surface reaction, and desorption. For each of the following cases, please write down a full set of elementary reaction mechanisms. (0) Extraction of Hydrogen in 3 stages, based on dehydrogenation of each bond-where the ensuing hydrogen product is adsorbed as a molecule on a single site, in one step. (3) Extraction of Hydrogen in 3 stages, based on dehydrogenation of each bond-where the ensuing hydrogen product is adsorbed atomically on a single site, leading eventually to 'associative' desorption of hydrogen. (b) The last dehydrogenation step leading to adsorbed Toluene is to be considered rate limiting and may be considered a reversible reaction. Using this assumption, please formulate the Langmuir-Hinshelwood kinetic term for each of the elementary reaction steps, shown in part (a)(i) and part (a)(ii)
1. Consider the following reaction - Dehydrogenation of Methyl Cyclohexane (MCH) to Toluene (TOL) using a Precious Metal (PI) supported on Alumina CH3 CH + 3H2 2 Typically, hydrogenation of a cyclo-alkane, like MCH, occurs in 3 or more stages, where one bond is dehydrogenated per stage, eventually resulting in the dehydrogenation of 3 bonds. Strong adsorption of MCH is likely to occur, but the adsorption of hydrogen (either as a molecule on a single site OR as an atom on a single site) is unclear. Therefore, in this question, two types of reaction mechanisms are to be considered, as discussed below. (a) You are to first propose a reaction mechanism which includes adsorption, surface reaction, and desorption. For each of the following cases, please write down a full set of elementary reaction mechanisms. (0) Extraction of Hydrogen in 3 stages, based on dehydrogenation of each bond-where the ensuing hydrogen product is adsorbed as a molecule on a single site, in one step. (3) Extraction of Hydrogen in 3 stages, based on dehydrogenation of each bond-where the ensuing hydrogen product is adsorbed atomically on a single site, leading eventually to 'associative' desorption of hydrogen. (b) The last dehydrogenation step leading to adsorbed Toluene is to be considered rate limiting and may be considered a reversible reaction. Using this assumption, please formulate the Langmuir-Hinshelwood kinetic term for each of the elementary reaction steps, shown in part (a)(i) and part (a)(ii)
Chemistry
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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Transcribed Image Text:1. Consider the following reaction - Dehydrogenation of Methyl Cyclohexane (MCH) to Toluene
(TOL) using a Precious Metal (Pt) supported on Alumina.
CH3
CH3
2
()
+ 3 H₂
Typically, hydrogenation of a cyclo-alkane, like MCH, occurs in 3 or more stages, where one
bond is dehydrogenated per stage, eventually resulting in the dehydrogenation of 3 bonds.
Strong adsorption of MCH is likely to occur, but the adsorption of hydrogen (either as a
molecule on a single site OR as an atom on a single site) is unclear. Therefore, in this
question, two types of reaction mechanisms are to be considered, as discussed below:
(a) You are to first propose a reaction mechanism which includes adsorption, surface reaction,
and desorption. For each of the following cases, please write down a full set of elementary
reaction mechanisms.
(0)
Extraction of Hydrogen in 3 stages, based on dehydrogenation of each bond-where
the ensuing hydrogen product is adsorbed as a molecule on a single site, in one
step.
Extraction of Hydrogen in 3 stages, based on dehydrogenation of each bond-where
the ensuing hydrogen product is adsorbed atomically on a single site, leading
eventually to 'associative' desorption of hydrogen.
(b) The last dehydrogenation step leading to adsorbed Toluene is to be considered rate limiting
and may be considered a reversible reaction. Using this assumption, please formulate the
Langmuir-Hinshelwood kinetic term for each of the elementary reaction steps, shown in
part (a)(i) and part (a)(ii)
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Step 1: Catalytic dehydrogenation reactions:
VIEWStep 2: a. (i) Extraction of Hydrogen in 3 stages, where the H product is adsorbed as a molecule:
VIEWStep 3: a. (ii) Extraction of Hydrogen in 3 stages, where the H product is adsorbed atomically:
VIEWStep 4: b. Formulating the Langmuir-Hinshelwood kinetic term for part (a)(i):
VIEWStep 5: b. Formulating the Langmuir-Hinshelwood kinetic term for part (a)(ii):
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