Temperature time trajectory In large scale reactors, such as those for hydrotreating and where deactivation by poisoning occurs, the catalyst decay is slow. Constant conversion with a decaying catalyst in a packed or fluidized bed is to increase the reaction rate to feed temperature. To T Determine the time temperature trajectory for a second order reaction to keep conversion constant in a CSTR if activation energies for reaction and decay are 30kJ/mol and 10kJ/mol respectively. [10]