Simulation of the ammonia oxidation process over an oxide monolith catalyst

Modeling of ammonia oxidation on a platinoid catalyst, taking into account the N2O formation

“…The studies performed by now [1][2][3][4] substantiate the suggested mechanism of the catalytic oxidation of ammonia on platinoid gauzes, suggest a kinetic model of the process, and allow fi nding the conditions that ensure the maximal NO yield. The results of our experimental studies on NH 3 oxidation on platinoid catalysts in combination with the published data show that, to ensure the maximal selectivity with respect to NO and the high intensity of the process, it is necessary to maintain conditions at which the overall process is controlled by external diffusion.…”

“…The results of our experimental studies on NH 3 oxidation on platinoid catalysts in combination with the published data show that, to ensure the maximal selectivity with respect to NO and the high intensity of the process, it is necessary to maintain conditions at which the overall process is controlled by external diffusion. At low NH 3 concentrations on the catalyst surface, typical of external diffusion control, the rate of NH 3 oxidation to N 2 O and N 2 sharply decreases, and it undergoes selective oxidation to NO [1][2][3][4].…”

Oxidation of ammonia on woven and knitted platinoid gauzes

“…It seems likely that the role of the homogeneous ammo nia reduction of nitrogen oxide will acquire great importance, due to the modification of platinoid gauzes. A mathematical model of the oxidation of ammonia on woven and knitted platinoid gauzes [5] reveals an increase in the mass transfer coefficient due to a smaller diameter of the wire and its larger specific external surface area. The calculated residual concen trations of ammonia downstream of a platinoid cata lytic stack have proven to be overestimated, relative to their experimental values.…”