| 초록 |
Emission of N2O from the diesel oxidation catalyst employing microporous TiO2 has been investigated in the presence of the soot. Here we have demonstrated that location of Pt catalyst supported on zeolitic microporous TiO2 obtained from hydrothermal reaction of bulk TiO2 at 430K in the presence of LiOH was found to be resulted in the superior catalytic performance compared to the Pt catalyst supported on alumina. Zeolitic microporous TiO2 suppresses significantly the N2O emission, while maintaining the excellent NOX reduction. The results suggested that the interaction of the soot with the Pt based diesel oxidation catalyst facilitated the N2O formation, which can be further accelerated when N is present in the soot. The use of zeolitic microporous TiO2 provides a new way of preparing SCR catalyst with a high thermal stability and superior catalytic performance. It can be also extended further to the other catalytic system employing TiO2-based substrate. |
