Di-metal-doped sulfur resisting perovskite catalysts for highly efficient H 2 -SCR of NO.

Lanthanide perovskite catalysts doped with limited palladium (to improve activity) and cerium (to improve sulfur resistance) were prepared using sol-gel method. In different B sites, lanthanide perovskites were studied at harsh conditions for H ₂ selective catalytic reduction of NO. The activity sequence was as follows: LaCeMnPd > LaCeCoPd > LaCeFePd. LaCeMnPd had a high NO conversion of 96.6% at only 150 °C. And it also had a surprising SO ₂ resistance in different SO ₂ concentrations. After cutting out SO ₂ , NO conversion recovered rapidly to its original level, indicating that the slight deactivation was reversible. In addition, the effect of gas hourly space velocity, H ₂ /NO ratio, O ₂ , and SO ₂ concentration was studied. And XRD, energy-dispersive X-ray, SEM, XPS, H ₂ -temperature programmed reduction, and NH ₃ -temperature programmed desorption were performed to characterize the catalysts. Graphical abstract ᅟ.