Reduction Of Nitrogen Oxides
Mostrando 1-12 de 34 artigos, teses e dissertações.
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1. De-NOx Performance and Mechanism of Mn-Based Low-Temperature SCR Catalysts Supported on Foamed Metal Nickel
A series of manganese-based catalysts supported on foamed metal nickel (FMN) with various Mn/Ni ratios was prepared for low-temperature selective catalytic reduction (SCR) of NO with NH3 (NH3-SCR). The effects of calcination temperature, amount of added Mn, optimal operating conditions, and H2O on the elimination of nitrogen oxides (de-NOx) performance of ca
J. Braz. Chem. Soc.. Publicado em: 2018-08
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2. OXIDATIVE-REFORMING OF METHANE AND PARTIAL OXIDATION OF METHANE REACTIONS OVER NiO/PrO2/ZrO2 CATALYSTS: EFFECT OF NICKEL CONTENT
Abstract In this work the behavior of NiO-PrO2-ZrO2 catalysts containing various nickel loadings was evaluated in the partial oxidation of methane and oxidative-reforming reactions of methane. The catalysts were characterized by X-Ray Diffraction Analysis (in situ-XRD), Temperature Programmed Reduction (H2-TPR), Scanning Electron Microscopy (SEM/EDX) and Ads
Braz. J. Chem. Eng.. Publicado em: 2016-09
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3. Association between NOx exposure and deaths caused by respiratory diseases in a medium-sized Brazilian city
Exposure to nitrogen oxides (NOx) emitted by burning fossil fuels has been associated with respiratory diseases. We aimed to estimate the effects of NOx exposure on mortality owing to respiratory diseases in residents of Taubaté, São Paulo, Brazil, of all ages and both sexes. This time-series ecological study from August 1, 2011 to July 31, 2012 used infor
Braz J Med Biol Res. Publicado em: 29/09/2015
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4. Medidas da emissão de poluentes e da eficiência na combustão assistida do glicerol residual de biodiesel. / Measurements of emissions and fuel efficiency of the assisted residual glycerol biodiesel.
With increased global production of biofuels in particular biodiesel, an excess of glycerol is being generated worldwide. This has caused a sharp drop in the price of this compound in the world market. Much thought has been given to a destination for this residue, since no one can lay it in the environment and one of the alternatives be to use would its calo
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/11/2010
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5. Preparation, characterization and evaluation of iron oxides and cobalt supported on activated carbon and polymeric catalysts for the dehydrogenation of ethylbenzene / Preparação, caracterização e avaliação de óxidos de ferro e cobalto suportados em carvão ativado polimérico como catalisador na reação de desidrogenação do etilbenzeno
In this work were synthesized catalysts supported on activated carbons, which were obtained by carbonization of a polymer matrix. The precursor of activated carbon was the sulfonated styrene-divinylbenzene copolymer, which was synthesized by suspension polymerization in the presence of inert diluents to produce a macroporous network structure. The chemical m
Publicado em: 2010
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6. Synthesis of mesoporous titania in rutile phase with pore-stable structure
Metastable-to-stable transformation in oxides is always associated with drastic reduction in surface area and/or porosity. Therefore, all earlier efforts to stabilize the pore structure of oxides undergoing a metastable-to-stable phase transformation are interesting for both scientific and technological concerns. This work presents a new experimental techniq
Brazilian Journal of Chemical Engineering. Publicado em: 2009-09
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7. Óxidos do tipo perovskita para reação de redução de no com CO
In this work, the perovskite-type oxides LaNiO3, LaMnO3, La0,7Sr0,3NiO3 and La0,7Sr0,3MnO3 were prepared by co-precipitation and tested in the NO reduction with CO at 400 and 500 ºC for 10 h. The catalysts were characterized by X-ray diffraction, temperature programmed reduction with hydrogen, nitrogen adsorption and chemical analysis. The nonstoichiometric
Química Nova. Publicado em: 2009
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8. Melhoria da Lingotabilidade do Aço Inoxidável Ferrítico AISI 409 na ArcelorMittal Inox Brasil
Stainless steels are known for their beauty and corrosion resistance. Ferritic stainless steels, without nickel, are responsible for the increase the consumption of stainless steels in the world, due to the economic advantage as compared to austenitic stainless steels. In the automobile industry, more specific in the cars exhaust system, the use of ferritic
Publicado em: 2009
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9. A comparative kinetic study of SNCR process using ammonia
The paper presents comparative kinetic modelling of nitrogen oxides (NOx) removal from flue gases by selective non-catalytic reduction process using ammonia as reducing agent. The computer code SENKIN is used in this study with the three published chemical kinetic mechanisms; Zanoelo, Kilpinen and Skreiberg. Kinetic modeling was performed for an isothermal p
Brazilian Journal of Chemical Engineering. Publicado em: 2008-03
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10. Catalisadores à base de Cu, Co ou Fe trocados ou suportados em zeólita USY avaliação na redução de NO com CO
The emissions of the nitrogen oxides (NOx) must be hardly reduced in the next years. The catalytic reduction of NO with CO is one of the possible processes with potential to be able to transform those oxides in N2. In that process, supported noble metals have been the most used, however, their low stability in the presence of water steam or SO2, have led to
Publicado em: 2008
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11. Perovskitas contendo lantânio, ferro e cobalto - melhoramento de propriedades texturais via síntese por nanomoldagem e avaliação como catalisadores na redução de NO com CO
Mixed oxides with perovskite structure have high potential as catalysts in gas depollution processes and particularly in the abatement of nitrogen oxides (NOx). Such solids could be considered as a promising alternative for the replacement of noble metals based catalysts, whose use is predominant. Great flexibility of composition, easy synthesis, low cost an
Publicado em: 2008
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12. Redução catalítica seletiva de óxidos de nitrogênio sobre hematita contendo cobre
The activity of copper-doped hematite in the SCR with propane, in the presence of oxygen, was evaluated in this work. It was found that copper sulfate led to the production of solids with different specific surface areas depending on the amount of copper. The sulfur and copper species were mainly located on the surface. The copper-containing catalysts were m
Química Nova. Publicado em: 2007-06