Catalyst Support
Mostrando 13-24 de 120 artigos, teses e dissertações.
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13. Study of the structural and morphological properties of copper catalysts supported on Al2O3 and TiO2 synthesized by the impregnation method
ABSTRACT Aluminum oxide and titanium oxide are widely used as catalytic support. Due to their characteristics and properties, they have several applications such as chemical processes, photocatalysis and pollution control. In this work, the catalytic supports of Al2O3 and TiO2 were impregnated with 2% of copper oxide by the method of impregnation. The cataly
Matéria (Rio J.). Publicado em: 20/05/2019
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14. Síntese, caracterização e modificação da hidroxiapatita com zinco para aplicação na reação de esterificação
RESUMO A hidroxiapatita tem se destacado entre os materiais cerâmicos devido a sua versatilidade estrutural, pois permite a substituição do Ca2+ ou do PO43-da sua estrutura possibilitando diversas aplicações. A utilização da hidroxiapatita como suporte e, ou catalisador tem recebido destaque como tema de pesquisa. Com isso, o objetivo deste trabalho f
Matéria (Rio J.). Publicado em: 20/05/2019
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15. Estudio de la actividad antifúngica de materiales conteniendo carbón proveniente de pilas en desuso
ABSTRACT The large number of batteries that are discarded and the environmental impact that the inadequate disposition of the waste of the same produces impelled to its recycling. Both alkaline and zinc-carbon batteries have as their main components zinc and carbon mixed with other oxides, in their internal fill. In this work, the silica synthesis was carrie
Matéria (Rio J.). Publicado em: 19/07/2018
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16. Recovery of Terephthalic Acid by employing magnetic nanoparticles as a solid support
Abstract The aim of this research work is focused on the improvement of Terephthalic acid recovery from PET wastes by using organically modified nano-Fe3O4@Cyanuric Chloride as the solid support. The performance of organically modified nano magnetic was examined in detail and the obtained results were compared with the unsupported reaction data. Required re
Polímeros. Publicado em: 15/03/2018
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17. SBA-15 as a Support for Nickel-Based Catalysts for Polymerization Reactions
Two mesoporous SBA-15 materials with different morphologies (spherical and fiber-shaped) were synthesized and evaluated as supports for nickel-based catalysts for polymerization reactions. The supports were pretreated with trimethylaluminum (TMA), and the catalyst dibromo-bis(4-amino-2,3,5,6-tetramethylimino)acenaphthene nickel(II) was attached to the suppor
J. Braz. Chem. Soc.. Publicado em: 2018-02
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18. Preparation of Au/TiO2 Catalyst by a Liquid-Phase Reduction Method for Preferential Oxidation of Carbon Monoxide in a Hydrogen Rich-Stream (CO-PROX reaction)
Au nanoparticles supported on TiO2 were prepared by a liquid-phase reduction method using HAuCl4.3H2O as the Au precursor, TiO2 as the support, a solution of ethylene glycol/water as solvent and reducing agent and sodium citrate as reducing agent and stabilizer. The Au/TiO2 catalysts were prepared using different routes and characterized by Energy-dispersive
Mat. Res.. Publicado em: 18/12/2017
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19. Synthesis, Characterization and Enhanced Photocatalytic Activity of Iron Oxide/Carbon Nanotube/Ag-doped TiO2 Nanocomposites
A novel magnetically recoverable catalyst (Fe/MWCNT/TiO2-Ag) was prepared in this study by a process that involves few steps. Titanium dioxide doped with silver and iron oxide was deposited on support of multi-walled carbon nanotubes (MWCNT). The synthesized catalysts were characterized by inductively coupled plasma mass spectrometry (ICP-MS), N2 adsorption/
J. Braz. Chem. Soc.. Publicado em: 2017-12
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20. Intercalation of Molybdate Ions into Ni/Zn Layered Double Hydroxide Salts: Synthesis, Characterization, and Preliminary Catalytic Activity in Methyl Transesterification of Soybean Oil
This study reports the synthesis and characterization of a Ni/Zn layered double hydroxide salt intercalated with acetate ions and the subsequent replacement of the acetate ions with molybdate ions via an ion exchange reaction, conducted at two different pH values. Regardless of the pH employed during the synthesis, the basal spacing in the Ni/Zn layered doub
J. Braz. Chem. Soc.. Publicado em: 2017-07
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21. NOVOS HÍBRIDOS BASEADOS EM OXIHIDRÓXIDO DE FERRO(III) E NANOPARTÍCULAS DE OURO (AuNPs/FeOOH) COMO CATALISADORES PARA A REDUÇÃO DE POLUENTES ORGÂNICOS AMBIENTAIS
A new δ-FeOOH supported nano-Au catalyst was prepared by a facile method using HAuCl4 as the gold source and NaBH4 as the reducing agent. The samples (denoted as AuNPs/FeOOH) were characterized by means of X-ray diffraction (XRD), UV-vis and infrared spectroscopies and scanning electron microscope (SEM). The obtained characterization data confirmed the form
Quím. Nova. Publicado em: 2017-06
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22. Evaluation of nickel and copper catalysts in biogas reforming for hydrogen production in SOFC
ABSTRACT The solid oxide fuel cells (SOFC) enable the efficient generation of clean energy, fitting the current requirements of the growing demand for electricity and for the environment preservation. When powered with biogas (from digesters of municipal wastes), the SOFCs also contribute to reduce the environmental impact of these wastes. The most suitable
Matéria (Rio J.). Publicado em: 22/05/2017
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23. Acidity and Characterization of 12-Tungstophosphoric Acid Supported on Silica-Alumina
This work deals with preparation and characterization of H3PW12O40 (H3PW) supported on silica-alumina. Impregnation of H3PW (15, 20, 30 and 40 wt.%) on commercial silica-alumina support in acidic aqueous solution is effective for preparing this catalyst keeping its Keggin structure, according to different methods of characterization. The catalysts were teste
J. Braz. Chem. Soc.. Publicado em: 2017-02
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24. Gas-Phase Conversion of Glycerol to Acetol: Influence of Support Acidity on the Catalytic Stability and Copper Surface Properties on the Activity
Mesoporous mixed copper-aluminum oxides and copper-silicon oxides were synthesized with polymeric precursors route in order to evaluate the effect of the support acidity on the catalytic stability due to the carbon deposit and the copper surface characteristics on the catalytic activity for the gas-phase conversion of glycerol to acetol. The samples were cha
J. Braz. Chem. Soc.. Publicado em: 2016-12