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a. What are the Schmidt numbers for CO and O₂ mass transfer? What species (CO, O2, CO₂) is considered the carrier gas? b. For CO mass transfer, what is the average convective mass- transfer coefficient (ke) over the 0.50 m length of the catalytic surface, and the local mass transfer coefficient (kex) at the far edge of the catalytic surface (x= L = 0.50 m)? c. Using boundary-layer theory, scale ke for CO mass transfer to ke for O₂ transfer. d. At 600 K, the surface reaction constant for the first-order oxidation reaction with respect to CO concentration is k,= 1.5 cm/s. What is the average molar flux of CO to the catalytic surface, assuming that the composition of CO in the bulk gas is maintained at 0.10 mole%?

a. What are the Schmidt numbers for CO and O₂ mass transfer? What species (CO, O2, CO₂) is considered the carrier gas? b. For CO mass transfer, what is the average convective mass- transfer coefficient (ke) over the 0.50 m length of the catalytic surface, and the local mass transfer coefficient (kex) at the far edge of the catalytic surface (x= L = 0.50 m)? c. Using boundary-layer theory, scale ke for CO mass transfer to ke for O₂ transfer. d. At 600 K, the surface reaction constant for the first-order oxidation reaction with respect to CO concentration is k,= 1.5 cm/s. What is the average molar flux of CO to the catalytic surface, assuming that the composition of CO in the bulk gas is maintained at 0.10 mole%?

Introduction to Chemical Engineering Thermodynamics
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
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28.16 Consider the process shown in the figure (next page). A bulk gas stream containing 0.10 mole% of carbon monoxide (CO) gas, 2.0 mole% O₂ gas, and 97.9 mole% of CO₂ gas flows over a flat catalytic surface of length 0.50 m at a bulk velocity of 40 m/s at 1.0 atm and 600 K. Heat-transfer processes maintain the gas stream and catalytic surface at 600 K. At this temperature, the catalytic surface promotes the oxidation reaction CO(g)+1/2O₂(g) → CO₂ (g). Let A = CO, B=O₂, C = CO₂. The gas-phase diffusion coefficients at 1.0 atm and 300 K are DAB=0.213 cm²/s, DAC= 0.155 cm²/s, DBC=0.166 cm²/s. What are the Schmidt numbers for CO and O₂ mass transfer? What species (CO, O₂, CO₂) is considered the carrier gas? b. For CO mass transfer, what is the average convective mass- transfer coefficient (ke) over the 0.50 m length of the catalytic surface, and local mass transfer coefficient (kex) at the far edge of the catalytic surface (x= L = 0.50 m)? a. c. Using boundary-layer theory, scale ke for CO mass transfer to ke for O₂ transfer. d. At 600 K, the surface reaction constant for the first-order oxidation reaction with respect to CO concentration is k,= 1.5 cm/s. What is the average molar flux of CO to the catalytic surface, assuming that the composition of CO in the bulk gas is maintained at 0.10 mole%? 0.1 mole% CO 2.0 mole% O₂ 97.9 mole% CO₂ 600 K, 1.0 atm V∞ = 40 m/s CO(A) + 1/2O₂(B) CO₂ (C) CA, NA I X = 0 CAS catalyst surface x = L = 0.5 m
Transcribed Image Text:28.16 Consider the process shown in the figure (next page). A bulk gas stream containing 0.10 mole% of carbon monoxide (CO) gas, 2.0 mole% O₂ gas, and 97.9 mole% of CO₂ gas flows over a flat catalytic surface of length 0.50 m at a bulk velocity of 40 m/s at 1.0 atm and 600 K. Heat-transfer processes maintain the gas stream and catalytic surface at 600 K. At this temperature, the catalytic surface promotes the oxidation reaction CO(g)+1/2O₂(g) → CO₂ (g). Let A = CO, B=O₂, C = CO₂. The gas-phase diffusion coefficients at 1.0 atm and 300 K are DAB=0.213 cm²/s, DAC= 0.155 cm²/s, DBC=0.166 cm²/s. What are the Schmidt numbers for CO and O₂ mass transfer? What species (CO, O₂, CO₂) is considered the carrier gas? b. For CO mass transfer, what is the average convective mass- transfer coefficient (ke) over the 0.50 m length of the catalytic surface, and local mass transfer coefficient (kex) at the far edge of the catalytic surface (x= L = 0.50 m)? a. c. Using boundary-layer theory, scale ke for CO mass transfer to ke for O₂ transfer. d. At 600 K, the surface reaction constant for the first-order oxidation reaction with respect to CO concentration is k,= 1.5 cm/s. What is the average molar flux of CO to the catalytic surface, assuming that the composition of CO in the bulk gas is maintained at 0.10 mole%? 0.1 mole% CO 2.0 mole% O₂ 97.9 mole% CO₂ 600 K, 1.0 atm V∞ = 40 m/s CO(A) + 1/2O₂(B) CO₂ (C) CA, NA I X = 0 CAS catalyst surface x = L = 0.5 m
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