NiFe2O4 as an active component of a platinum group metal-free automotive three-way catalyst

Abstract

To develop a platinum group metal (PGM)-free automotive three-way catalyst (TWC), we investigated the structure–activity relationship for Fe–Ni oxide catalysts and found NiFe₂O₄ with a spinel structure is an active component of the three-way catalytic reaction (NO–C₃H₆–CO–O₂). The NiFe₂O₄ catalyst exhibited a light-off temperature below 300 °C for NO reduction, which was more than 50 °C lower than previously reported PGM-free TWCs at a high space velocity (GHSV = 140 000 h⁻¹).