Kinetic model for Pd-based membranes coking/deactivation in propane dehydrogenation processes

This work aims at providing insight into the deactivation mechanism of Pd-based membranes in propane dehydrogenation processes. Thermogravimetric analysis (TGA) experiments were conducted to study adsorption and coking propylene over conventional thin layer (TL) double-skinned (DS) under several operating conditions. A mechanistic monolayer-multilayer coke growth model was selected mathematically describe membrane observed during TGA experiments. In addition, reaction rate formation its influence on has been studied. The able hydrogen flux decay time suggests that monolayer is main responsible for deactivation. Multilayer also causes but with a smaller order than coke, both TL DS membranes. Among two types, deactivates faster, i.e. higher membrane, which equal 1.55 former 0.51 latter. related number active sites available controlling step reaction, are most probably given by addition ceramic Al2O3 protective layer. XPS spectra further confirms that, presence Pd, contribute carbon evidencing different nature formed Finally, experimental results permeation types operative conditions confirmed validity derived parametrized kinetic models findings this provide essential tools design optimization reactors