Influences of heat treatment and DeNOx performance of cordierite honeycombs washcoated with spinel catalysts

► MAl2O4, M = Ga and Zn spinel as catalyst precursors. ► NO reduction on Ga2O3-Al2O3-ZnO (GAZ) catalysts. ► The influence of heat treatment (800-1400 °C) on the catalytic activities. ► The durability of GAZ/cordierites in the presence of H2O vapor.