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Title:
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Selective catalytic reduction of nitrous oxide with hydrocarbons using a SO2 resistant Fe/zeolite catalyst
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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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1-12-1999
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ECN report number:
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Document type:
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ECN-I--99-014
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Other
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Number of pages:
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Full text:
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14
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Download PDF
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Abstract:
Removal of nitrous oxide (N2O) from exhausts of chemical plants andcertain combustion facilities is an effective way for substantial reduction
of greenhouse gas emissions from anthropogenic sources. ECN has developed a
catalyst for catalytic removal of N2O from various exhaust gases using
hydrocarbons (propane or methane) as reducing agent. The catalyst is an
ion-exchanged zeolite, specially modified to improve its resistance against
sulphur. In bench scale tests, the catalyst has proven to perform at
relatively low temperatures. In a synthetic flue gas containing oxygen and
water, 90% conversion of N2O to N2 was reached at 350 deg C. Activity
decreases slightly when NO and SO2 are present. The catalyst was found to be
resistant against all regular constituents of flue gases: O2, H2O, CO2,
CO, NOx and most importantly SO2. In stability tests, no apparent loss of
activity was recorded in 2000 hours time-on-stream. The catalyst was
originally developed for selective catalytic reduction (SCR) of N2O, but
recently it has also demonstrated strong activity in SCR of NOx. The capacity
to remove both NOx and N2O from the same gas mixture is an interesting
development, since nearly all sources of N2O also emit NOx. Investigations
are still going on, but the first results indicate that ECN's SCR catalyst
has a great potential for integrated SCR of NOx and N2O with hydrocarbons
from a variety of off-gases
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