Copper Catalysts
Mostrando 13-24 de 44 artigos, teses e dissertações.
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13. Influence of the pH on Al2O3:CuO pigments prepared by a polymeric precursor method
Copper (II) aluminate, CuAl2O4, which is known to be an inverse spinel contains a d9 metal ion and possesses interesting electronic, magnetic and catalytic properties and is used in industry as ceramic pigments, coatings and catalysts. Al2O3 with 10 mol% Cu (AlCu10) was synthesized by the polymeric precursor method varying the pH of the precursor solution wi
Mat. Res.. Publicado em: 02/11/2012
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14. Complexos de cobre (II) com bases de Schiff tridentadas, tipo ONN e tetradentadas simétricas e assimétricas, tipo ONNO: síntese e caracterização e estudos como catalisadores na oxidação de catecóis / Complexes of Copper (II) with ONN type tridentate Schiff bases and type ONNO tetradentate symmetric and symmetric: Synthesis and Characterization Studies and as catalysts in the oxidation of catechols
Os complexos do tipo salen são uma classe importante dos compostos de coordenação e são utilizados como catalisadores em vários sistemas homogêneos e heterogêneos. Complexos de metais de transição têm participação em muitos processos químicos, o que torna o estudo desses muito interessantes. Pesquisas mostram que os complexos de salen [salen= N,
Publicado em: 2011
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15. Efeito da VariaÃÃo de LÃtio em Catalisadores de Ferro tendo PotÃssio e Cobre como Promotores para a SÃntese Fischer-Tropsch / EFFECT OF LITHIUM IN IRON BASED CATALYST FOR FISCHER-TROPSCH SYNTHESIS CONTAINING POTASSIUM AND COPPER AS PROMOTERS
New environmental regulations and a possible instability in the international oil market have led to a renewal interest in the Fischer-Tropsch Synthesis (FTS), which is an alternative to produce more environmental friendly fuels. The FTS is a polymerization reaction, in which syngas (H2 + CO) reacts in the presence of catalyst to produce hydrocarbons. Three
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/02/2010
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16. Performance evaluation of commercial copper chromites as burning rate catalyst for solid propellants
Abstract: Copper chromites are well known as burning rate catalysts for the combustion of composite solid propellants, used as a source of energy for rocket propulsion. The propellant burning rate depends upon the catalyst characteristics such as chemical composition and specific surface area. In this work, copper chromite samples from different suppliers we
J. Aerosp. Technol. Manag.. Publicado em: 2010-12
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17. Spectroscopic characterization of schiff base-copper complexes immobilized in smectite clays
Herein, the immobilization of some Schiff base-copper(II) complexes in smectite clays is described as a strategy for the heterogenization of homogeneous catalysts. The obtained materials were characterized by spectroscopic techniques, mostly UV/Vis, EPR, XANES and luminescence spectroscopy. SWy-2 and synthetic Laponite clays were used for the immobilization
Química Nova. Publicado em: 2010
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18. Estudo da reação de oxidação preferencial do co sobre o sistema CuO/CeO2-TiO2
Cu catalysts supported on CeO2, TiO2 and CeO2/TiO2 were prepared by precipitation method and used for preferential oxidation of carbon monoxide contained in a hydrogen flow generated by methane steam reforming. The samples were characterized by XRD, BET and TPR techniques. The catalytic properties were studied in the 50-330ºC range by using a quartz micro-r
Química Nova. Publicado em: 2010
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19. Use of biomimetic systems at the preparation of amperometric sensors / Utilização de sistemas biomiméticos no Preparo de sensores amperométricos
This work describe the immobilization of the copper(II) dinuclear complex ([Cu2(apyhist)2Cl2](ClO4)2), (apyhist =[(4-imidazolyl)ethylene-2-amino-1-ethylpyridine]), and others similar copper(II) compounds mono- and tetranuclears, obtained in water solution or for desprotonation of the imidazole ligant, in the Nafion membrane on glass carbon electrode surface,
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 04/09/2009
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20. Copper on activated carbon for catalytic wet air oxidation
Textile industry is an important source of water contamination. Some of the organic contaminants cannot be eliminated by nature in a reasonable period. Heterogeneous catalytic wet air oxidation is one of the most effective methods to purify wastewater with organic contaminants. In this work, catalysts based on copper supported on activated carbon were synthe
Materials Research. Publicado em: 2009-03
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21. 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
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22. Produção de hidrogênio a partir da reforma a vapor de etanol utilizando catalisadores Cu/Ni/gama-Al2o3
Cu/Ni/gamma-Al2O3 catalysts were prepared by an impregnation method with 2.5 or 5% wt of copper and 5 or 15% wt of nickel and applied in ethanol steam reforming. The catalysts were characterized by atomic absorption spectrophotometry, X-ray diffraction, temperature programmed reduction with hydrogen and nitrogen adsorption. The samples showed low crystallini
Química Nova. Publicado em: 2007-04
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23. Síntese e avaliação de óxido de ferro suportado em carvão ativado polimérico como catalisador na desidrogenação do etilbenzeno
In this work, activated carbon were synthesized through carbonization of a polymer, containing iron oxides with and without copper. The precursor of activated carbon was a styrenedivinylbenzene copolymer (StyDVB) synthesized through suspension polymerization, in the presence of inert diluentes to obtain a macroporous structure. The resin was sulfonated with
Publicado em: 2007
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24. Síntese, caracterização e aplicação de catalisadores mistos contendo cobalto e cobre
Studies on the use of catalysts have been directed to develop new processes taking into consideration the economic point of view (for example, substitution for cheaper raw materials) as well as the green chemistry aspects. The majority of supported catalysts is prepared by the impregnation method of the metallic salt over a material of high specific surface
Publicado em: 2007