11. A 10 mm diameter Al2O3 tablet containing 15% Cu is replaced with another 10 mm tablet containing the same amount of Cu but with a hole in its center 4 mm in diameter. What will be the consequences for conversion and other process parameters if the reaction is limited by
1. Chemical kinetic (1 point)
2. Pore diffusion (1 point)
3. bulk mass transfer (1 point)
12. 2% Pd/ϒ-Al2O3 particle is to be used to abate the methane from a gas-fired power plant. The methane contained ~ 2 ppm of a sulfur compound. What characterization methods for each (a, b, c and d) would be used to determine the various modes of deactivation for each separate case listed below? Also suggest the shape of the conversion/temperature profile you generate in the lab from a sample of deactivated catalyst using methane as a model compound.
a. (2 point) The data recorded over-night indicated a catalyst saw an excessively high
temperature due to a failed heat exchanger upstream.
b. (2 point) Some sulfur compounds were not removed completely from the methane fuel
c. (2 points) Upstream piping is experiencing corrosion with solid particles of rust (Fe2O3) being carried downstream into the catalyst bed. What deactivation mode is likely occurring? Other than replacing the piping can you suggest what the plant manager could do to minimize deactivation?
d. (2 points) The catalyst is coated with high boiling organic oil leaking from a compressor upstream. Suggest a method for regenerating the activity? What characterization method would be helpful?
13. The partial oxidation of an olefin to produce an epoxide is catalyzed by supported Mo oxide.
a. (2 points) Write the general rate equations for the formation of each product (1 point). Ignore the reverse reaction since the equilibrium constant is very large. The formation of the desired product was determined to have a reaction order of 0.6 for olefin with the O2 order equal to 1. The path for the CO2 reaction has an olefin order of 0.20 with the O2 order also being 1. What could you change in the process to enhance expoxide production and minimize CO2 formation (1 point)?
b. (3 points) The undesired CO2 path has an activation of 90 Kj/mol while the desired path has an activation energy of 40 Kj/mol. What operating condition will benefit the desired reaction?
Answer these 3 questions, if you have any problems or need some support, please let me know ASAP. Thank you!
11. A 10 mm diameter Al2O3 tablet containing 15% Cu is replaced with another 10
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