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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.

Suppressed N2O formation during NH3 selective catalytic reduction using vanadium on zeolitic microporous TiO2