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International Journal of Energy for a Clean Environment
SJR: 0.195 SNIP: 0.435 CiteScore™: 0.74

ISSN Druckformat: 2150-3621
ISSN Online: 2150-363X

International Journal of Energy for a Clean Environment

Formerly Known as Clean Air: International Journal on Energy for a Clean Environment

DOI: 10.1615/InterJEnerCleanEnv.v5.i1.50
10 pages


F. Goncalves
Universidade Federal Fluminense, Pólo Universitário de Rio das Ostras, Faculdade Federal de Rio das Ostras.
J. L. Figueiredo
Laboratory of Catalysis and Materials, Department of Chemical Engineering, Faculty of Engineering of the University of Porto, Rua Dr Roberto Frias, 4200-465, Porto, Portugal


Nitrous oxide, N2O, is now recognized as an environmental pollutant. Methods to remove N2O are relatively scarce and only a few studies have been reported. In the present work, N2O reduction was performed over mono and bimetallic carbon-supported catalysts. One potential advantage of such catalysts lies in the carbon-reducing properties, eliminating the need for the addition of an external reducing agent.
Carbon-supported Ni catalysts were tested and their activities and stabilities were compared with Ni−K bimetallic catalysts. A commercial activated carbon was used as catalyst support and the metals were introduced by the excess-solution impregnation method.
Catalyst performances were evaluated by temperature-programmed reaction and isothermal reaction at 350°C.
Impregnation of Ni resulted in a higher activity, lower onset reaction temperature and lower temperature required for reaching 100% conversion. In isothermal tests at 350°C, Ni catalysts presented poor stability, which was increased by K addition. The better performances obtained by co-impregnation of K revealed the strong ability of K for N2O dissociative chemisorption and oxygen transfer.