Total fixed nitrogen, conversion from

Catalytic measurements were made using 100 mg catalyst diluted with 400 mg of inactive aAl203 in a fixed-bed flow reactor. The typical gas nuxture consisted of 2000 vpm NO, 2000 vpm CsHg, 10 vol. % O2, balance He, without or with 10 vol. % water (total flow rate 10 1 h ). In the absence of water in the reactant nrixture, the temperature was increased from 300 to 773 K (or 873 K) (heating rate 2 K min ) and then decreased to 423 K. Water was then added at 423 K and the temperature increased and decreased again as above. The analysis was performed by gas chromatography with two columns (porapak and molecular sieve) and a TCD detector for CO2, N2O, O2, N2 and CO, and with a porapak column and a flame ionisation detector for hydrocarbons. Moreover, on-line IR and UV analyzers were used for NO, NO2, CO2, and N2O analysis. The NO conversion was calculated from the N2 production and the nitrogen balance was checked. 

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