Removal of nitrogen monoxide from exhaust gases through novel catalytic processes

Iwamoto, Masakazu; Hamada, Hideaki

doi:10.1016/0920-5861(91)80074-j

Cited by 768 publications

(293 citation statements)

References 48 publications

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“…The response to NO at 300 °C indicates a decrease in the number of charge carriers (and implies reduction of NO). The set of reactions shown by Equations 3 -7 are commonly invoked to explain the sensing mechanism of n-type semiconductor metal-oxides to NO, as has been reported elsewhere [26][27][28][29][30][31][32][33][34]. In general, the catalytic decomposition of NO on metal-oxide such as TiO 2 , CeO 2 , WO 3 at T > 100 °C yields N 2 O (which further decomposes to N 2 and O 2 ), N 2 and O 2 (dominant products at T > 900 °C) and, to a lesser extent, NO 2 (which is not produced at T > 500 °C).…”

Section: °Cmentioning

confidence: 99%

Copper tungstate thin-films for nitric oxide sensing

Gonzalez

Dunford

et al. 2012

Sensors and Actuators B: Chemical

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/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://dx.doi.org/10.1016/j.snb.2012.06.067 Sensors and Actuators B: Chemical, 173, pp. 169-176, 2012-07-08 Copper tungstate thin-films for nitric oxide sensing Gonzalez, C. M.; Du, X.; Dunford, J. L.; Post, M. L.

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Section: °Cmentioning

confidence: 99%

Copper tungstate thin-films for nitric oxide sensing

Gonzalez

Dunford

et al. 2012

Sensors and Actuators B: Chemical

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“…This catalyst involves problems relating to the transport and storage of NH 3 and to vanadium toxicity. 5 In their studies of several catalysts prepared from zeolites substituted with H + , Na + , K + , Mg 2+ , Ca 2+ , Cr 3+ , Fe 3+ , Co 3+ , Ni 2+ , Cu 2+ , Zn 2+ and Ag, Iwamoto et al 6,7 found that Cu-ZSM5 provided better NO reduction activity when hydrocarbons were used as reductants. However, this catalyst has a low thermal stability 6 and deactivates in the presence of water vapor and SO 2 .…”

Section: Introductionmentioning

confidence: 99%

“…5 In their studies of several catalysts prepared from zeolites substituted with H + , Na + , K + , Mg 2+ , Ca 2+ , Cr 3+ , Fe 3+ , Co 3+ , Ni 2+ , Cu 2+ , Zn 2+ and Ag, Iwamoto et al 6,7 found that Cu-ZSM5 provided better NO reduction activity when hydrocarbons were used as reductants. However, this catalyst has a low thermal stability 6 and deactivates in the presence of water vapor and SO 2 . Moreover, large amounts of water vapor inhibit the catalyst's action, promoting the migration of Al +3 out of the zeolite structure and leading to a loss of the activity of the Cu ions attached to the Al sites.…”

Section: Introductionmentioning

confidence: 99%

Selective reduction of NOx by propylene over silver catalyst under oxidative conditions

Cónsul

Thiele

Baibich

et al. 2004

J. Braz. Chem. Soc.

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Neste trabalho foram estudados catalisadores Ag/Al 2 O 3 e Ag/Al 2 O 3 /Corderita, preparados por um método de impregnação convencional, na reação de redução de NO utilizando propeno como agente redutor. Os catalisadores foram caracterizados por redução a temperatura programada (RTP), quimissorção de oxigênio e área superficial, pelo método BET. A atividade catalítica foi determinada utilizando uma mistura reacional contendo 100 ppm de NO, 250 ppm de C 3 H 6 e 2% de oxigênio e uma velocidade espacial de 100000 h -1 . Os produtos da reação foram estudados por FTIR. Os resultados dos testes catalíticos mostraram 56% de conversão de NO para o catalisador 2,22%Ag/ Al 2 O 3 a 723 K. Os catalisadores de cordierita apresentaram um comportamento semelhante, mas a temperatura de máxima conversão de NO deslocou-se para temperaturas menores.In this study, a Ag/Al 2 O 3 and Ag/Al 2 O 3 /Cordierite catalyst was prepared by a conventional impregnation method and NOx reduction investigated using propylene as a reducing agent. The catalysts were characterized by Temperature Programmed Reduction (TPR), oxygen chemisorption and surface area, using the standard BET method. The catalytic activities were measured under the same reaction conditions, i.e., 100 ppm NO, 250 ppm C 3 H 6 , 2% of oxygen and 100000 h -1 space velocity. The reaction products were analyzed by FTIR. The results of the catalytic activity obtained for the 2.22%Ag/Al 2 O 3 catalyst showed 56% NO conversion at 723 K. The catalysts based on Cordierite presented an analogous behavior, but the temperature of maximum NO conversion was lower (620 K).Keywords: NOx reduction, silver/alumina catalyst, propylene, Cordierite IntroductionThe generation of NOx effluents from stationary and mobile sources poses an important environmental problem. [1][2][3][4] Gas effluent control in internal combustion engines, whose air/gasoline ratio is stoichiometric, can be achieved by using the so-called "three way catalysts" (TWC) typically containing Pt and Rh as the active metals. On the other hand, lean-burn engines, such as diesel engines and stationary sources for industrial use, operate with excess oxygen to ensure complete combustion. In these cases, TWCs are ineffective for NO elimination, for which reason selective catalytic reduction (SCR) is used. A typical commercial SCR catalyst uses V 2 O 5 -WO 3 -TiO 2 as the metal system and NH 3 as the reducing agent. This catalyst involves problems relating to the transport and storage of NH 3 and to vanadium toxicity. 5 In their studies of several catalysts prepared from zeolites substituted with H + , Na + , K + , Mg 2+ , Ca 2+ , Cr 3+ , Fe 3+ , Co 3+ , Ni 2+ , Cu 2+ , Zn 2+ and Ag, Iwamoto et al. 6,7 found that Cu-ZSM5 provided better NO reduction activity when hydrocarbons were used as reductants. However, this catalyst has a low thermal stability 6 and deactivates in the presence of water vapor and SO 2 . Moreover, large amounts of water vapor inhibit the catalyst's action, promoting the migration of Al +3 out of the zeolite struct...

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“…Zeolite, catalysts including Cu-zeolite attract great attention as they efficiently detoxify gas emissions from nitrogen oxides and other dangerous compounds [1,2]. The catalysts are most promising if prepared as honeycomb monoliths since they are more universal and efficient in this form.…”

Section: Introductionmentioning

confidence: 99%

Catalytic and adsorptive properties of a Cu-ZSM-5 catalyst synthesized by solid-phase method

Sazonova

Komova

Rebrov

et al. 1997

React Kinet Catal Lett

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Document VersionPublisher's PDF, also known as Version of Record (includes final page, issue and volume numbers)Please check the document version of this publication:• A submitted manuscript is the author's version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website.• The final author version and the galley proof are versions of the publication after peer review.• The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publicationCitation for published version (APA): Sazonova, N. N., Komova, O. V., Rebrov, E. V., Simakov, A. V., Kulikovskaya, N. A., Rogov, V. A., ... Barannik, G. B. (1997). Catalytic and adsorptive properties of a Cu-ZSM-5 catalyst synthesized by solid-phase method. Reaction Kinetics and Catalysis Letters, 60(2), 313-321. DOI: 10.1007/BF02475694 General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. AbstractA Cu-exchanged catalyst Cu-ZSM-5 has been obtained via an environmentally friendly solid-phase synthesis. Its catalytic activity and adsorptive properties are compared with those of a catalyst prepared by the ion exchange from solution. The properties of the catalysts were found to be similar.

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Removal of nitrogen monoxide from exhaust gases through novel catalytic processes

Cited by 768 publications

References 48 publications

Copper tungstate thin-films for nitric oxide sensing

Copper tungstate thin-films for nitric oxide sensing

Selective reduction of NOx by propylene over silver catalyst under oxidative conditions

Catalytic and adsorptive properties of a Cu-ZSM-5 catalyst synthesized by solid-phase method

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