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

Abstract

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 H₂ 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 SO₂ resistance in different SO₂ concentrations. After cutting out SO₂, NO conversion recovered rapidly to its original level, indicating that the slight deactivation was reversible. In addition, the effect of gas hourly space velocity, H₂/NO ratio, O₂, and SO₂ concentration was studied. And XRD, energy-dispersive X-ray, SEM, XPS, H₂-temperature programmed reduction, and NH₃-temperature programmed desorption were performed to characterize the catalysts.

Graphical abstract

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