Reaction Kinetics I
Reaction Kinetics I CHEG 5321
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This 2 page Class Notes was uploaded by Emery Shields on Thursday September 17, 2015. The Class Notes belongs to CHEG 5321 at University of Connecticut taught by Benjamin Wilhite in Fall. Since its upload, it has received 41 views. For similar materials see /class/205859/cheg-5321-university-of-connecticut in Chemical Engineering at University of Connecticut.
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Date Created: 09/17/15
CHEG 321 Process Kinetics Due Friday 10122007 Rate Mechanisms for Catalytic Reactions 1Consider the hydrogenation of ethylene over Palladium catalyst From surfacescience reports of ethylene and hydrogen adsorption over 111 Pd crystals the following rate mechanism is proposed Overall HZCCH2 H2 69 H3CCH3 A B2 69 C 1 AZS e a S39A39S 2B2ZS 92BS 3 S39A39S 2 BS 69 SOS 2 s 4 03 ea c 2 s W assume complete coverage of active sites with either A B or C ie S 0 a Derive the rate expression for this reaction assuming that adsorption of A is rate limiting b Derive the rate expression for this reaction assuming that adsorption of B is rate limiting c Derive the rate expression for this reaction assuming that surface reaction is rate limiting d Sketch the initial rate of reaction for cases a b c if A0 varies and B0 and St remain constant e Sketch the initial rate of reaction for cases a b c if B0 varies and A0 and St remain constant f Sketch the initial rate of reaction for cases a b c if S varies and A0 and B0 remain constant 2Consider the isomerization of isobutane to nbutane which follows the mechanism Overall A 69 B 1 A S 69 AS 2 AS 69 BS 3 BS 69 B S Derive the rate expression for this reaction assuming that there is no rate limiting step ie applying pseudosteadystate hypothesis to AS and BS 3Consider the dualsite oxidation of carbon monoxide over RhCeOz which follows the mechanism 100 02 6 9 CO2 2 02 31 ea 2 031 3 C0 32 ea cos2 4 031 0032 ea 00232 5 00232 69 co2 32 Derive the rate expression if the surface reaction 4 is rate limiting
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