Investigation of NOx reduction activity of Rh/ZnO nanowires catalyst

Özet

The main pollutant exhaust emissions from gasoline engines are HCs, CO, and NOx. Today, the removal ofNOx known to cause the formation of ground-level ozone, acid rain and smog is the most significantissue. The stringent emission regulations require that the emission of NOx is limited. In this study, thecatalyst was prepared by impregnating Rh on the ZnO NWs grown on monolith cordierite channels inorder to investigate in particular its NOx reduction activity and potential of ZnO nanowire structures tobe used as monolith catalyst carrier. ZnO nanowire arrays have different morphology and effectiveporosity. Furthermore, thickness of ZnO nanowire arrays are less than traditional wash coat. Therefore,the ZnO nanowire arrays can be used as alternative monolith catalyst carrier. The structure of the catalystwas examined by SEM and XRD. Activity tests were performed under lean, stoichiometric and richconditions in order to examine specifically NOx reduction activity of the finished catalyst. The NOreduction activity of the Rh/ZnO NWs catalyst decreases with the increasing oxygen in the gas mixture.This situation is expected in case of excessive oxygen in TWC reactions.