Technique for Measuring the Total Concentration of Gaseous Fixed Nitrogen Species |
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Authors: | James E Hardy John J Knarr |
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Institution: | Exxon Research and Engineering Company , Linden , New Jersey , USA |
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Abstract: | This paper reports the development of a rapid, continuous technique for analyzing fixed nitrogen species (NH3, HCN, CH3NH2, etc.). The technique uses a platinum catalyst at low pressure in combination with a conventional chemiluminescent NO x analyzer. Previous workers observed that conventional stainless steel catalysts, and platinum catalysts operated at atmospheric pressure, do not reliably convert NH3 to NO. The most serious problem was the variation in the efficiency of these catalysts with operating conditions. Changes in temperature, gas composition, or XNH3 could change the conversion efficiency from 99.9% to <30%. The new conversion technique, however, is quantitative up to several thousand ppm NH3 in either O2/He or O2/CO2/N2. |
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