Decomposition of nitrous oxide on pillared clays.
Alumina-pillared smectites have been found to abate nitrous oxide in the presence of methane. The results indicate that the yield of the reaction (N20 --> N2 + (1/2)O2) increases when pillared clays are exchanged with transition metals, single-pass conversion rates of >70% being attainable. In particular, when double exchanged (calcium and subsequently copper) alumina pillared montmorillonite/beidellite is used as a catalyst, de-N2O activity reaches a maximum, which is maintained even after 4 h of work at a space velocity of 5.5 h(-1). A mechanism for the reaction is suggested, which implies that N2O is first adsorbed by the catalyst and then decomposes through two different paths: catalyst oxidation and catalyst reduction. Such a redox process explains the kinetic data.
De Stefanis
A
A
Porous Materials and Industrial Catalysis Group, Istituto di Chimica dei Materiali, Area della Ricerca di Roma del CNR, Monterotondo Stazione (RM), Italy.
Dondi
M
M
Perez
G
G
Tomlinson
A A
AA
D004787:Environmental Pollution / Q000517:prevention & control; D007700:Kinetics; D008697:Methane / Q000737:chemistry; D009609:Nitrous Oxide / Q000378:metabolism*; D010084:Oxidation-Reduction; D012989:Soil Pollutants / Q000378:metabolism*
D012989:Soil Pollutants; D009609:Nitrous Oxide; D008697:Methane