Di-metal-doped sulfur resisting perovskite catalysts for highly efficient H 2 -SCR of NO
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH(2018)
摘要
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
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关键词
SCR, NOx, Catalyst, Hydrogen, Perovskite, SO2
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