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Evolution Mechanism of N2O for the Selective Catalytic Reduction of NOx by NH3 Over Cu-SSZ-13 Assisted Fe-BEA Catalysts by Pan Wang; Miaomiao Jin; Dan Yu; Shuzhan Bai; Lili Lei is a Materials Science article available to read on EtoBox.

What is Evolution Mechanism of N2O for the Selective Catalytic Reduction of NOx by NH3 Over Cu-SSZ-13 Assisted Fe-BEA Catalysts about?

The effects of N 2 O formation over Cu-SSZ-13 assisted Fe-BEA (1Cu1Fe-M) catalysts, for the selective catalytic reduction of NO x by NH 3 , were systematically investigated to elucidate the mechanism of N 2 O evolution. The experimental results showed that NO 2 /NO x ratio determined the amount of N 2 O formation, while zeolite framework topology, O 2 concentration, NH 3 oxidation and NO oxidation had only a slight effect on N 2 O formation. For different NO 2 /NO x feed conditions (0, 0.2, 0.4, 0.5), 1Cu1Fe-M catalysts showed maximum N 2 O formation and decreases in N 2 selectivity at around 230 °C (21 ppm of N 2 O yield, 94% N 2 selectivity) and 570 °C (18 ppm of N 2 O yield, 95%N 2 selectivity). A proposed mechanism shows that NO 2 guided the formation of ammonium nitrate species on Lewis acid sites at low temperature, to account for N 2 O formation at low temperature. Besides this, the addition of NO 2 increases the side reactions at high temperature and cause a relative decrease in Bronsted acid sites. Moreover, the decrease in N 2 O formation over 1Cu1Fe-M catalysts was observed. These results indicated that the FeO x species of 1Cu1Fe-M contribute to N 2 O decomposition by t

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Author

Pan Wang; Miaomiao Jin; Dan Yu; Shuzhan Bai; Lili Lei

Publisher

Springer Science and Business Media LLC

Published

2021

Language

EN

Field

Materials Science (Physical Sciences)