Suppressed N(2)O formation during NH(3) selective catalytic reduction using vanadium on zeolitic microporous TiO(2)

Emission of N(2)O from mobile and off-road engine is now being currently regulated because of its high impact compared to that of CO(2), thereby implying that N(2)O formation from the exhaust gas after-treatment system should be suppressed. Selective catalytic reduction using vanadium supported TiO(2) catalyst in mobile and off-road engine has been considered to be major source for N(2)O emission in the system. Here we have demonstrated that vanadium catalyst supported on zeolitic microporous TiO(2) obtained from the hydrothermal reaction of bulk TiO(2) at 400 K in the presence of LiOH suppresses significantly the N(2)O emission compared to conventional VO(x)/TiO(2) catalyst, while maintaining the excellent NO(x) reduction, which was ascribed to the location of VO(x) domain in the micropore of TiO(2), resulting in the strong metal support interaction. The use of zeolitic microporous TiO(2) 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 TiO(2)-based substrate.