Evaluation of NOx Storage Catalysts as an Effective System for NOx Removal from the Exhaust Gas of Leanburn Gasoline Engines

Brogan, Mark S.; Brisley, R. J.; Walker, Andy; Webster, Dennis; Boegner, W; Fekete, Nicholas P.; Kramer, Michael J.; Krutzsch, B.; Voigtländer, D.

doi:10.4271/952490

Cited by 52 publications

(7 citation statements)

References 7 publications

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“…The predominant species was NO 3 - on metal oxides, particularly on oxides of base metals 11a,b, However, it is also known that CeO 2 alone does not chemisorb NO at elevated temperatures …”

Section: Resultsmentioning

confidence: 99%

“…Alternatively, desorption/decomposition can be accomplished by injecting a reducing gas. Still another alternative, applicable to lean-burn engines, is to dope noble metals in the sorbent and to run the engine with pulses of “rich-burn” conditions, during which time the adsorbed NO x decomposes into N 2 . 11a,b …”

Section: Introductionmentioning

confidence: 99%

“…Indeed, there has been a long search for such a sorbent for NO x , as reviewed recently. , The more promising sorbents have been supported transition metal oxides, − ZSM-5 or MFI zeolites exchanged by Cu 2+ and other cations, Fe 2 O 3 dispersed on activated carbon fibers, , zeolites, , Y-Ba-Cu-O, , mixed metal oxides, 11a,b,, and carbon . The most promising sorbent, in terms of NO x capacity and rate of uptake, appears to be Mn-Zr (1:1 molar ratio) mixed oxides, reported recently by Eguchi et al…”

Section: Introductionmentioning

confidence: 99%

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Selective Adsorption of NO_xfrom Hot Combustion Gases by Ce-Doped CuO/TiO₂

Yang

Krist

et al. 1997

Energy Fuels

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CuO/TiO2 has been shown to be a superior sorbent for selective, reversible adsorption of NO from hot combustion gases. High NO x adsorption capacities at 200 and 300 °C were obtained with a 5% CuO/TiO2 sorbent, and the NO x desorbed rapidly at 450 °C. Doping with 2% Ce on the CuO/TiO2 sorbent further increased both uptake rates (50% increase in initial rate) and NO x capacity (by 30%). In a direct comparison with the most promising known sorbent, MnO/ZrO2 (1:1 molar ratio), reported by Eguchi et al. (J. Catal. 1996, 158, 420), the Ce-CuO/TiO2 sorbent showed both higher uptake rates (by 100% in initial rate) and higher NO x capacity (by 15%). The effects of CO2, H2O, and SO2 on NO x sorption on the Ce-CuO/TiO2 sorbent were studied at 200 °C. CO2 slightly decreased the initial uptake rate but increased the NO x capacity. H2O coadsorbed with NO x on different sites, both reversibly (i.e. desorbed at 450 °C). SO2 irreversibly adsorbed (likely to sulfate the surface of TiO2) and decreased the NO x capacity by approximately 20%. The BET surface area of the TiO2 support was 50 m2/g. Further studies with TiO2 of higher surface areas are in progress.

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“…The predominant species was NO 3 - on metal oxides, particularly on oxides of base metals 11a,b, However, it is also known that CeO 2 alone does not chemisorb NO at elevated temperatures …”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Selective Adsorption of NO_xfrom Hot Combustion Gases by Ce-Doped CuO/TiO₂

Yang

Krist

et al. 1997

Energy Fuels

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“…Though first developed for lean burn gasoline engines [3][4][5][6][7] NSR catalysts are now more widely investigated for NO x control in diesel vehicles [8,9]. The operating mechanism of NSR catalysts has attracted considerable attention (see for example [10][11][12][13]) and involves the interaction of NO 2 with an adsorber component under oxidising conditions with a periodic rich excursion to decompose and reduce the stored NO x species.…”

Section: Introductionmentioning

confidence: 99%

Thermal decomposition of bulk and supported barium nitrate

et al. 2015

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“…One recently developed solution for removing NO X species in an oxidizing environment is NO X storage/ reduction (NSR) [1][2][3]. NO X is reduced to N 2 via two consecutive phases of a cycle.…”

Section: Introductionmentioning

confidence: 99%

Spatially-Resolved Calorimetry: Using IR Thermography to Measure Temperature and Trapped NOX Distributions on a NOX Adsorber Catalyst

et al. 2008

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Spatial-and time-resolved temperature distributions over a Pt/Ba/Al 2 O 3 model NO X storage/reduction (NSR) catalyst were measured using infra-red thermography. The heat generated during regeneration was correlated to surface nitrate reduction, thereby revealing the concentration of surface nitrates at specific locations along the catalyst. The results demonstrate that there is more nitrate formation at upstream positions relative to downstream, or from front to back of the catalyst, with short trapping times. However, as more NO X was trapped on the catalyst during longer trapping times, it was found that the largest amount of NO X was trapped slightly downstream of the inlet, evolving to a local maximum in amount trapped. Applying infrared (IR) thermography to this system resulted in a spatially resolved calorimetry method via the correlation of temperature to the distribution of sorbed nitrate species along the catalyst.

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Evaluation of NOx Storage Catalysts as an Effective System for NOx Removal from the Exhaust Gas of Leanburn Gasoline Engines

Cited by 52 publications

References 7 publications

Selective Adsorption of NO_xfrom Hot Combustion Gases by Ce-Doped CuO/TiO₂

Selective Adsorption of NO_xfrom Hot Combustion Gases by Ce-Doped CuO/TiO₂

Thermal decomposition of bulk and supported barium nitrate

Spatially-Resolved Calorimetry: Using IR Thermography to Measure Temperature and Trapped NOX Distributions on a NOX Adsorber Catalyst

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Evaluation of NOx Storage Catalysts as an Effective System for NOx Removal from the Exhaust Gas of Leanburn Gasoline Engines

Cited by 52 publications

References 7 publications

Selective Adsorption of NOxfrom Hot Combustion Gases by Ce-Doped CuO/TiO2

Selective Adsorption of NOxfrom Hot Combustion Gases by Ce-Doped CuO/TiO2

Thermal decomposition of bulk and supported barium nitrate

Spatially-Resolved Calorimetry: Using IR Thermography to Measure Temperature and Trapped NOX Distributions on a NOX Adsorber Catalyst

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Selective Adsorption of NO_xfrom Hot Combustion Gases by Ce-Doped CuO/TiO₂

Selective Adsorption of NO_xfrom Hot Combustion Gases by Ce-Doped CuO/TiO₂