and state assumptions. Conversion will be kept relatively low at 20%. Problem 1 HO- b) Which reactor type would require a larger amount of catalyst? Motivate in less than 50 words, the reaction isothermally or adiabatically? Motivate in less than 50 words. a) To achieve a high selectivity to the desired ethylene oxide product (D), would it be better to run It is specified that the feed has a fixed composition, temperature and pressure, and the ethylene has an activation energy of 125 kJ mol-1. Both gas phase reactions are exothermic and irreversible. 100 kJ mol-1 over a certain catalyst. The complete combustion of ethylene to CO2 (U1) and water (U2) The catalytic selective oxidation of ethylene (A) to ethylene oxide (D) has an activation energy of Autu A>D E=125 kJ/mol E2=100 kJ/mol) (5) (5 [10 marks]