Change of activation Energy after the usage of catalyst
Posted: Sat Mar 04, 2023 2:35 pm
Hi guys and girls,
I am reading a paper about Thiol-epoxy reaction kinetics with and without the usage of DABCO. For the reaction without DABCO they used a temperature of 160 degrees celsius and the calculated activation energy of the Reaction was 64 +/- 2 kJ mol-1. With DABCO they used an oven Temperature of 60 degrees celsius and the calculated activation energy was 71 +/- 2 kJ mol-1. I always thought that a catalyst lowers the needed activation energy. Is the activation energy dependent on the Temperature, i dont think so. Why is there an increase of the activation energy but at the same time a decrease of the needed Temperature?
And one more Information after the usage of DABCO the kinetic order went from 3 to 2.
I am reading a paper about Thiol-epoxy reaction kinetics with and without the usage of DABCO. For the reaction without DABCO they used a temperature of 160 degrees celsius and the calculated activation energy of the Reaction was 64 +/- 2 kJ mol-1. With DABCO they used an oven Temperature of 60 degrees celsius and the calculated activation energy was 71 +/- 2 kJ mol-1. I always thought that a catalyst lowers the needed activation energy. Is the activation energy dependent on the Temperature, i dont think so. Why is there an increase of the activation energy but at the same time a decrease of the needed Temperature?
And one more Information after the usage of DABCO the kinetic order went from 3 to 2.