Reactors with Complex (Non‐Conventional) Reaction Kinetic Forms

The kinetic data are rewritten in a format that matches how Bussche and Froment should be entered into Aspen Plus reaction kinetic sheets. For the reaction rate constant, the basis is kmol/ (kg cat·s·Pa) for an overall first-order reaction in terms of reacting species and will be, of course, kmol/ (kg cat·s·Pa2) for an overall second-order kinetics given that the basis for [Ci] is the partial pressure expressed in Pa not in bar, as indicated in Aspen Plus built-in help. For rate-controlled reactions, Aspen Plus provides a built-in Langmuir-Hinshelwood-Hougen-Watson (LHHW) expression for calculating the rate of reaction. Consider the kinetics of methane combustion over steam-aged Pt-Pd catalyst while using steam to examine the inhibition effect of steam, produced during the combustion, on catalyst. In 'Catalyst' tab, select 'Catalyst present in the reactor' and set the 'Particle density' to 1000 kg/m3 and 'Bed voidage' to 0.35.