Simple Kinetic Modeling of Selective Reduction of Nitric Oxide in Diesel Exhaust Over Cu-Zn/ZSM-5 Monolithic Catalyst

An integral reactor-based kinetic model for the selective reduction of nitric oxide over cu-zn/zsm-5 washcoated monolithic catalysts is reported. the active component was washcoated onto a 400 cpsi ceramic monolithic substrate at a loading of 23.6 wt. % usage 2,000 ppm iso-butane was used as the reductant. high activity without significant pressure drop was achieved at a ghsv of 16,000 h^-1. third order polynomial satisfactorily fitted the activity versus space time data and a low activation energy of +30.3 kj/mol was obtained. the applicability of the model was demonstrated within 300-400 ºc and space time of 0.12-0.94 s.