Reduction Of Nitrogen Oxides
Mostrando 13-24 de 34 artigos, teses e dissertações.
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13. Desenvolvimento de catalisadores bifuncionais de óxido de zircônio modificado por óxidos de tungstênio e molibdênio contendo platina para a reação de isomerização de n-parafinas / Development of bifunctional catalysts on zircon oxide modify by tungsten and molybdenum oxides contain platinum for nparaffin isomerization
Bifunctional catalysts based on zircon oxide modified by tungsten (W = 10, 15 and 20 %) and by molybdenum oxide (Mo= 10, 15 e 20 %) containg platinum (Pt = 1%) were prepared by the polymeric precursor method. For comparison, catalysts the tungsten base was also prepared by the impregnation method. After calcinations at 600, 700 and 800 C, the catalysts were
Publicado em: 2007
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14. CinÃtica da reduÃÃo de NOx pelo Ãcido amino sulfÃmico: modelagem e desenvolvimento
Elevated levels of nitrogen oxides (NOX) from flue gases have recently become a major issue in industrial environment. This causes that the laws are becoming each time more demanding. The most employed reduction processes are: absorption by an aqueous acidic solution and catalytic gas-solid reduction. The nitrogen oxides absorbed into water leads to the form
Publicado em: 2006
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15. "Óxidos do tipo Perovskitas para reações de decomposição direta de NO e redução de NO com CO" / "Reduction of NO by CO and direct decomposition of NO on perovskite-type oxide"
A important technology to reduce the atmospheric pollution is the use of catalysts, to transform high pollutant as NO in other inoffensive gases to the environment. In this work, the perovskite oxides La2CuO4, LaNiO3, LaMnO3, La1,4Sr0,6CuO4, La0,7Sr0,3NiO3 e La0,7Sr0,3MnO3 were prepared through co-precipitation method and characterized by X-ray diffraction a
Publicado em: 2006
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16. Development of alternative catalysts for the reduction of nitrogen oxides with carbon monoxide in plants of fcc. / Desenvolvimento de catalisadores alternativos para a redução de óxidos de nitrogênio com monóxido de carbono em plantas de fcc.
Recentemente, o desenvolvimento de tecnologias eficientes visando à redução dos óxidos de nitrogênio, em regeneradores de unidades de craqueamento catalítico em leito fluidizado, tem se tornado uma grande preocupação, devido aos rigorosos limites de emissão impostos pela legislação ambiental. Como a maioria das refinarias utiliza promotores de com
Publicado em: 2006
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17. Simultaneous influence of gas mixture composition and process temperature on Fe2O3->FeO reduction kinetics: neural network modeling
The kinetics of Fe2O3->FeO reaction was investigated. The thermogravimetric (TGA) data covered the reduction of hematite both by pure species (nitrogen diluted CO or H2) and by their mixture. The conventional analysis has indicated that initially the reduction of hematite is a complex, surface controlled process, however once a thin layer of lower oxidation
Brazilian Journal of Chemical Engineering. Publicado em: 2005-09
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18. Desenvolvimento de catalisadores de óxido de ferro ou óxido de zirconio sulfatado para a redução de óxidos de nitrogênio com propano.
Nitrogen oxides are responsible for the three of the main phenomena related global pollution. The photochemical smog, the acid rain and the pollution of continental water by nitrate species, as well as the greenhouse effect, are related to nitrogen compounds. In the last decades several technologies have been proposed and used to reduce the emissions of nitr
Publicado em: 2004
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19. Nonthermal plasma reactors for the production of light hydrocarbon olefins from heavy oil
During the last decade, nonthermal plasma technology was applied in many different fields, focusing attention on the destruction of harmful compounds in the air. This paper deals with nonthermal plasma reactors for the conversion of heavy oil into light hydrocarbon olefins, to be employed as gasoline components or to be added in small amounts for the catalyt
Brazilian Journal of Chemical Engineering. Publicado em: 2003-03
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20. Caracterização de escorias e recuperação do silicio / Characterization of slag and recovery of the silicon
Metallurgieal Grade Silicon (MGSi) is produced by a well-established industrial process that consists of the carbo-reduction of quartz in a submerged are fumace under high temperature. The process is an intensive energy consumption method (13 - 15 kWh to each kilogram of produced MGSi). After tapered, the MGSi is submitted to some purification stages in orde
Publicado em: 2003
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21. Studio Sperimentale e Modellazione di Processi Selettivi Non Catalitici di Abbattimento di Ossidi di Azoto utilizzando Ammoniaca e Urea come Agenti di Riduzione. Cinetica Chimica e Fluidodinamica. / Experimental and Modelling Study of Selective Non-Catalytic Reduction of Nitrogen Oxides by Ammonia and Urea. Chemical Kinetics and Fluid Dynamics.
Selective non-catalytic reduction (SNCR) process is a post-combustion strategy aimed to reduce the amount of NOx in combustion exhausts through the injection of a reducing compound downstream the main combustion region. The chemical kinetics of the Thermal DeNOx and NOxOUT processes, whose involve the addition of ammonia and urea respectively, was investigat
Publicado em: 1999
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22. Inhibition of methanogenesis in salt marsh sediments and whole-cell suspensions of methanogenic bacteria by nitrogen oxides.
Hydrogen-dependent evolution of methane from salt marsh sediments and whole-cell suspensions of Methanobacterium thermoautotrophicum and Methanobacterium fornicicum ceased or decreased after the introduction of nitrate, nitrite, nitric oxide, or nitrous oxide. Sulfite had a similar effect on methanogenesis in the whole-cell suspensions. In salt marsh sedimen
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23. Taxis Response of Various Denitrifying Bacteria to Nitrate and Nitrite
The taxis response of Rhodobacter sphaeroides 2.4.1 and 2.4.3, Rhodopseudomonas palustris, and Agrobacterium tumefaciens to nitrate and nitrite was evaluated by observing the macroscopic behavior of cells suspended in soft agar and incubated under various conditions. R. sphaeroides 2.4.3, which is capable of both nitrate and nitrite reduction, showed a taxis
American Society for Microbiology.
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24. Pilot Randomized Double-Blind Trial of Treatment of Mycobacterium ulcerans Disease (Buruli Ulcer) with Topical Nitrogen Oxides
Mycobacterium ulcerans disease (Buruli ulcer) is a serious ulcerating skin disease which is common in many tropical countries. Standard treatment, by extensive excision and skin grafting, is not available in rural communities where the disease is common. We evaluated the efficacy and safety of treatment with topical nitrogen oxides. Thirty-seven patients wit
American Society for Microbiology.