Nox Reduction
Mostrando 25-36 de 42 artigos, teses e dissertações.
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25. 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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26. Preparation, structural and electrochemical properties of V2O5-WO3 xerogel composite / Obtenção, caracterização e estudos das propriedades de compósitos formados por xerogéis de pentóxido de vanádio e óxido de tungstênio
Vanadium pentoxide xerogel has a bi-dimensional structure which is suitable for intercalation of a variety of ions, organic compounds, and even polymeric species. In addition, when associated with other metal oxides such as WO3 and MoO3, it presents an important role in catalysis, since the resulting oxides act as promoters in catalytic reduction of the NOx
Publicado em: 2007
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27. 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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28. 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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29. Estudo de um processo de combustÃo de gÃs totalflex para calcinaÃÃo da Gipsita em regiÃes remotas
The industrial plaster production (CaSO4.1/2H2O) in Brazil is carried through by the method of dehydration (calcination) of natural crude gypsum (CaSO4.2H2O), using heat of burning essentially of solid fuels (firewood, oil coke) and liquids (oil BPF, alternative oil). Constant increase in the price of the energy matrix has motivated the calcinadoras to searc
Publicado em: 2006
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30. Reduction of pollutants emissions on SI engines: accomplishments with efficiency increase
This paper presents an experimental study aiming to identify the means to minimize the reduction of the overall performance of a gasoline engine when employing the Exhaust-Gas Recirculation (EGR) technique that reduces NOx emissions. The increase of the compression ratio and turbocharging was evaluated as a mean to recover the original performance. The forma
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2005-09
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31. Selective reduction of NOx by propylene over silver catalyst under oxidative conditions
Neste trabalho foram estudados catalisadores Ag/Al2O3 e Ag/Al2O3/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 ati
Journal of the Brazilian Chemical Society. Publicado em: 2004-08
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32. Decomposição catalítica de óxidos de nitrogênio
Contaminant gases in the atmosphere constitute an important problem to be solved in the world. The NOx gases produced as a consequence of engine high temperatures are deleterious to environment and human health, as they promote acid rain and can act in the same way as freons in the destruction of the ozone layer in the stratosphere. In this review, three way
Química Nova. Publicado em: 2004-06
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33. 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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34. Lipid peroxidation and nitric oxide inactivation in postmenopausal women
OBJECTIVE: To assess the effect of endogenous estrogens on the bioavailability of nitric oxide (·NO) and in the formation of lipid peroxidation products in pre- and postmenopausal women. METHODS: NOx and S-nitrosothiols were determined by gaseous phase chemiluminescence, nitrotyrosine was determined by ELISA, COx (cholesterol oxides) by gas chromatography,
Arquivos Brasileiros de Cardiologia. Publicado em: 2003-04
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35. Desenvolvimento do precesso de reduÃÃo de Ãcido nitroso por Ãcido amino sulfÃmico. Modelagem cinÃtica associada à transferÃncia gÃs-lÃquido
The combustion of organic products, in particular, the natural gas, leads to the generation of nitrogenated oxides (NOx = NO and NO2; N2O) from both sources, the nitrogenous originated from the combustion air and nitrogenated compounds present in the fuel. NOx emissions can damage the human health and environment. They have been contributing widely to the fo
Publicado em: 2003
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36. 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