No abstract

A strategy is proposed to estimate lumped kinetic constants in fluid catalytic cracking (FCC) reactions. This method decreases the number of simultaneously estimated parameters. The 3-, 4-, and a new 5-lump kinetic models and experimental data obtained at 480, 500, and 520 °C in a microactivity reactor are used to illustrate the procedure. Activation energies for each involved reaction are also reported.

In this work, the role of hydrodynamics in an industrial-scale packed-bed catalytic reactor with a low tube/ particle diameter ratio (d t /d p ∼ 3) and the role of redox dynamics of the catalyst surface together with the use of a catalyst activity profile are assessed on the heat transport during the partial oxidation of o-xylene on a V 2 O 5 /TiO 2 catalyst. Temperature and concentration observations at different steady-state conditions are used to test the modeling approach, and reasonably good predictions are obtained when (1) the information contained in the heat-transport parameters, estimated from a boundary layer approximation to the hydrodynamics in the absence of chemical reactions [Ind. Eng. Chem. Res. 2007, 46 (23), 7426-7435], is used in the reactor model and (2) the redox catalyst dynamics, included in the reaction kinetics, is used, together with an empirical catalyst activity profile.