Abstract
Nickel and sulfate co-modified CeO 2-ZrO 2 catalysts were prepared by sol-gel method. The catalysts were characterized by XRD, FTIR, XPS, NH 3 chemisorption and NH 3-SCR activity tests. The results showed that the enhanced acidity of CeO 2-ZrO 2 catalysts by nickel and sulfate co-modification was responsible for the broadened temperature window and improved the selectivity to N 2 in NH 3-SCR deNO x . The introduction of nickel to CeO 2-ZrO 2 solid solutions resulted in more Ce 3+ on surface of catalyst, leading to an increased Lewis acidity of catalyst. Higher Lewis acidity of catalyst facilitated ammonia activation at low temperature (<300 °C) and thereby improved the NH 3-SCR activity. The enhanced high-temperature (>300 °C) activity and selectivity of catalysts arose from the introduction of Brønsted acid sites (less oxidative than Lewis acid sites) by sulfate modification.
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