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Local ammonia stora...
Local ammonia storage and ammonia inhibition in a monolithic copper-beta zeolite SCR catalyst
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- Auvray, Xavier, 1986 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Partridge, W. P. (author)
- Oak Ridge National Laboratory
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- Choi, J. S. (author)
- Oak Ridge National Laboratory
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- Pihl, J. A. (author)
- Oak Ridge National Laboratory
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- Yezerets, A. (author)
- Cummins Inc.
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- Kamasamudram, K. (author)
- Cummins Inc.
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- Currier, N. W. (author)
- Cummins Inc.
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- Olsson, Louise, 1974 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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(creator_code:org_t)
- Elsevier BV, 2012
- 2012
- English.
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In: Applied Catalysis B: Environmental. - : Elsevier BV. - 0926-3373 .- 1873-3883. ; 126, s. 144-152
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Abstract
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- Selective catalytic reduction of NO with NH3 was studied on a Cu-beta zeolite catalyst, with specific focus on the distributed NH3 capacity utilization and inhibition. In addition, several other relevant catalyst parameter distributions were quantified including the SCR zone, or catalyst region where SCR occurs, and NO and NH3 oxidation. We show that the full NH3 capacity (100% coverage) is used within the SCR zone for a range of temperatures. By corollary, unused NH3 capacity exists downstream of the SCR zone. Consequently, the unused capacity relative to the total capacity is indicative of the portion of the catalyst unused for SCR. Dynamic NH3 inhibition distributions, which create local transient conversion inflections, are measured. Dynamic inhibition is observed where the gas phase NH3 and NO concentrations are high, driving rapid NH3 coverage buildup and SCR. Accordingly, we observe dynamic inhibition at low temperatures and in hydrothermally aged states, but predict its existence very near the catalyst front in higher conversion conditions where we did not specifically monitor its impact. While this paper addresses some general distributed SCR performance parameters including Oxidation and SCR zone, our major new contributions are associated with the NH3 capacity saturation within the SCR zone and dynamic inhibition distributions and the associated observations. These new insights are relevant to developing accurate models, designs and control strategies for automotive SCR catalyst applications.
Subject headings
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
Keyword
- low-temperature
- Ammonia
- reduction catalyst
- NO
- Distributed reactions
- nitric-oxide
- Zeolite
- selective reduction
- NH3 capacity
- diesel exhaust
- urea-scr
- cu-zeolite
- Cu-beta
- SCR
- nox storage
- no(x) storage
- NH3 inhibition
- alumina catalysts
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Auvray, Xavier, ...
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Partridge, W. P.
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Choi, J. S.
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Pihl, J. A.
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Yezerets, A.
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Kamasamudram, K.
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show more...
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Currier, N. W.
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Olsson, Louise, ...
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Chemical Science ...
- Articles in the publication
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Applied Catalysi ...
- By the university
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Chalmers University of Technology