- Please Can You Help With This Question 1 (116.49 KiB) Viewed 34 times
Please can you help with this question ?
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answerhappygod
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Please can you help with this question ?
Please can you help with this question ?
The catalytic liquid phase irreversible reaction (A→B) is performed using a non-porous catalyst. Several experiments have been performed and it was shown that the reaction kinetics can be described according to: −rA=1+c2CAsc1CAs−rA in mol m−2s−1 and CA in mol m−3 Where CAs is the concentration of A near the catalyst surface. The constants c1 and c2 were fitted and found to be 1.5⋅10−3 mol m−2 s−1 and 1.0⋅10−3 m3 mol−1 respectively. a) Briefly discuss the reaction mechanism that you think applies. Also relate the constants c1 and c2 to adsorption- and reaction constants. Can you propose a numerical value for the surface reaction constant? (6) To further study the reaction, experiments are carried out in a long pipe (L=10 m), where the inside of the pipe (R=0.025 m) is coated with a thin layer of the non-porous catalyst. The feed to the solution is 1.0 L s−1(1.0⋅10−3 m3 s−1) and the inlet concentration of A is 1000 molm−3. b) Determine the conversion of A in the pipe, if external mass transfer limitations can be neglected. X=79% The operator of the "pipe experiments" starts to doubt the assumption of neglecting external mass transfer effects and does some calculations and finds that the external mass transfer coefficient, in the used pipe and under the experimental flow conditions, equals 1.0⋅10−3 m/s. c) Show that the concentration of A near the surface of the entrance of the pipe (CAso) is half of the bulk concentration. Is the operator right in doubting the absence of external mass transfer limitations? Motivate! (6) d) Determine the conversion of A in the pipe, taking external mass transfer limitations into account. (7)
The catalytic liquid phase irreversible reaction (A→B) is performed using a non-porous catalyst. Several experiments have been performed and it was shown that the reaction kinetics can be described according to: −rA=1+c2CAsc1CAs−rA in mol m−2s−1 and CA in mol m−3 Where CAs is the concentration of A near the catalyst surface. The constants c1 and c2 were fitted and found to be 1.5⋅10−3 mol m−2 s−1 and 1.0⋅10−3 m3 mol−1 respectively. a) Briefly discuss the reaction mechanism that you think applies. Also relate the constants c1 and c2 to adsorption- and reaction constants. Can you propose a numerical value for the surface reaction constant? (6) To further study the reaction, experiments are carried out in a long pipe (L=10 m), where the inside of the pipe (R=0.025 m) is coated with a thin layer of the non-porous catalyst. The feed to the solution is 1.0 L s−1(1.0⋅10−3 m3 s−1) and the inlet concentration of A is 1000 molm−3. b) Determine the conversion of A in the pipe, if external mass transfer limitations can be neglected. X=79% The operator of the "pipe experiments" starts to doubt the assumption of neglecting external mass transfer effects and does some calculations and finds that the external mass transfer coefficient, in the used pipe and under the experimental flow conditions, equals 1.0⋅10−3 m/s. c) Show that the concentration of A near the surface of the entrance of the pipe (CAso) is half of the bulk concentration. Is the operator right in doubting the absence of external mass transfer limitations? Motivate! (6) d) Determine the conversion of A in the pipe, taking external mass transfer limitations into account. (7)
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