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Title:
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Combined catalytic removal of NOx and N2O in a single reactor from the tail gas of a nitric acid plant : final report.
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Author(s):
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Published by:
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Publication date:
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ECN
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1-3-2002
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ECN report number:
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Document type:
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ECN-C--02-009
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ECN publication
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Number of pages:
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Full text:
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29
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Download PDF
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Abstract:
The nitric acid industry in the Netherlands is a major industrial sourceof nitrous oxide (N2O), an important contributor to the greenhouse effect.
In many nitric acid plants also the reduction of the emissions of NOx
is desirable. This project aims at developing a technique for the simultaneous
removal of NOx and N2O by selective catalytic reduction using hydrocarbons
as reductant. A system comprising of two catalysts in a single reactor
has been tested under conditions representative for a Dutch nitric acid
plant (1500 ppmv N2O, 500 ppmv NO, 0.5 vol.% H2O, 2.5 vol.% O2). Both
at atmospheric and high pressure (10 bar(a)) about 90% removal efficiency
of NOx and N2O was achieved at 350°C when 1000 ppmv of propane was added.
The cost efficiency of the atmospheric as well as the high-pressure
set-up are about equal to the reference case (separate conventional
NH3-DeNOx and propane-DeN2O): about 2 ? per ton CO2 equivalents or 1.8
? per kg NOx.
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