| 초록 |
The catalytic NO decomposition requiring zero reductants has been regarded as an ideal DeNOx technology, however, a significant hurdle is an inferior activity with the catalyst degradation as a function of time on stream. During direct NO decomposition (DND: 2NO → N2 + O2), the dissociated oxygen from NO strongly adsorbs on the active sites, blocking further progress of the NO adsorption. We observed that the NO conversion of Rh supported on PrOx severely decreased from 85% to 25% at 600 ℃ during 200 min of long-term periodic tests. However, the catalytic performance was dramatically recovered up to 100% of the NO conversion by the regeneration with pulsing 5,000 ppm of CO for 5 min intermittently. In addition, we confirmed that the Rh surface poisoned by oxygen was cleaned up by the reduction treatment, thereby producing available sites for further NO decomposition. The systematic analysis of the reactor data will be presented at the KIChE spring conference, together with various surface characterization supporting our findings. |
