Nitrous oxide, decomposition over

Heyden A, Peters B, Bell AT, Kell FJ (2005) Comprehensive DFT study of nitrous oxide decomposition over Fe-ZSM-5. J Phys Chem B 109 1857-1873... 

Heyden A, Hansen N, Bell AT, Keil FJ (2006) Nitrous oxide decomposition over Fe-ZSM-5 in the presence of nitric oxide a comprehensive DFT study. J Phys Chem B 110 17096-17114... 

Copper metal surface area was determined by nitrous oxide decomposition. A sample of catalyst (0.2 g) was reduced by heating to 563 K under a flow of 10 % H2/N2 (50 cm min"1) at a heating rate of 3 deg.min 1. The catalyst was then held at this temperature for 1 h before the gas flow was switched to helium. After 0.5 h the catalyst was cooled in to 333 K and a flow of 5 %N20/He (50 cm3mirr ) passed over the sample for 0.25 h to surface oxidise the copper. At the end of this period the flow was switched to 10 % H2/N2 (50 entitlin 1) and the sample heated at a heating rate of 3 deg.min"1. The hydrogen up-take was quantified, from this a... 

The decomposition of nitrous oxide over various metal oxides has been widely investigated by many investigators (1-3). Dell, Stone and Tiley (4) have compared the reactivity of metal oxides and shown that in general p-type oxides were the best catalysts and n-type the worst, with insulators occupying an intermediate position. It has been generally accepted (5) that this correlation indicates that the electronic structure of the catalyst is an important factor in the mechanism of the decomposition of nitrous oxide over metal oxides catalysts. The reaction is usually written (4) as... 

Kannan, S. (1998). Decomposition of nitrous oxide over the catalysts derived from hydrotalcite-like compounds. Appl. Clay Sci. 13, 347. 

Perez Ramirez, J., Overeijnder, J., Kapteijn, F. and Moulijn, J. A. (1999). Structural promotion and stabilizing effect of Mg in the catalytic decomposition of nitrous oxide over calcined hydrotalcite-like compounds. 

Sometimes reactions have complex rate expressions that cannot be separated into solely temperature-dependent and concentration-dependent portions. In the decomposition of nitrous oxide over platinum,... 

Fig. 26. Comparison of Arrhenius plots for the decomposition of nitrous oxide over different catalysts (1) Pt/Al203 (2) Pt/Al203 (3) Pd/C (4) La08Srtt2CoO3 (5) La Sr FeOj (6) La08Sr02MnO3 (7) La3 8Sr02CuO4 (8) La(18Sr,)2Cr03 and Lal)8SrIJ2Y03. With permission from Gunasekaran et al. (1995).

Another example for the check of the stoichiometric consistency is the catalytic decomposition of nitrogen oxide (NO) with hydrogen (H2) over alumina supported Rli monolith. Besides the main reaction, the formation of nitrous oxide (N2O) and self-decomposition also take place. The overall reactions are given below 2N0+2H2=>N2+H20, 2NO+H2=>N20+H20 2N20=>2N2+02. The system consists of three linearly independent reactions. The vector of chemical symbols is a = [ A NO 02 N20 H2 ] and consequently, the stoichiometric matrix becomes... 

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