Molybdenum Carbide
Mostrando 1-12 de 12 artigos, teses e dissertações.
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1. Activity and Stability of Dispersed Multi Metallic Pt-based Catalysts for CO Tolerance in Proton Exchange Membrane Fuel Cell Anodes
ABSTRACT Studies aiming at improving the activity and stability of dispersed W and Mo containing Pt catalysts for the CO tolerance in proton exchange membrane fuel cell (PEMFC) anodes are revised for the following catalyst systems: (1) a carbon supported PtMo electrocatalyst submitted to heat treatments; (2) Pt and PtMo nanoparticles deposited on carbon-supp
An. Acad. Bras. Ciênc.. Publicado em: 16/04/2018
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2. Microstructural Evolution and Phase Transformation in Laser Cladding of Cr and Mo Powder on Grey Cast Iron: Mixture Design of Experiment (DOE)
Laser cladding on grey cast iron at high power processing was investigated for microstructural evolution and phase transformation to enhance surface properties. Cladding was designed using a mixture of DOE with peak power (Pp) and pulse repetition frequency (PRF), and a mixture component of Cr and Mo ratio as factors. Microstructural findings indicated absol
Mat. Res.. Publicado em: 21/11/2017
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3. Dry Sliding Wear Behaviour of Aluminium 5059/SiC/MoS2 Hybrid Metal Matrix Composites
The present study is to investigate the influence of weight percentage of silicon carbide (SiC) (5,10 %, 15%) and particle size (10,20,40µm) of SiC and constant 2% of Molybdenum disulphide(MoS2)is reinforced with aluminium matrix. Wear performance of the composite was carried out through pin-on-disc method to calculate friction coefficient and wear resistan
Mat. Res.. Publicado em: 28/09/2017
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4. ON THE SYNTHESIS OF MOLYBDENUM CARBIDE WITH COBALT ADDITION VIA GAS-SOLID REACTIONS IN A CH4/H2 ATMOSPHERE
Abstract Due to ever more severe environmental regulations regarding SOx, NOx and other pollutants' emissions, there has been an interest in developing new and improved catalysts for hydroprocessing reactions. Mo2C has been reported to display good selectivity and activity for those reactions, especially for HDS. Addition of another metal to the carbide stru
Braz. J. Chem. Eng.. Publicado em: 2016-09
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5. Catalisadores de Pd metálico modificados por líquidos iônicos para a hidrogenação seletiva de compostos poli-insaturados
In this work, heterogeneous catalysts immobilized on supported ionic liquid (IL) were prepared, characterized and investigated in hydrogenation reactions of the substrates 1,5-cyclooctadiene (1,5-COD), trans-cinnamaldehyde (CALD) and nitrobenzene (NB). Two methods were used to prepare the catalysts. In the first, commercial Pd/C catalyst was coated with diff
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 06/08/2012
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6. Sintese de nanotubos de carbono por CVD utilizando catalisadores à base de ferro e molibdênio suportados em matrizes cerâmicas
Molybdenum is known for its synergistic effect in the synthesis of carbon nanotubes (CNs) by chemical vapor deposition (CVD method). When added to typical catalysts like iron, nickel, and cobalt, even in small quantities, it is increases the yield of these nanostructures. The presence of Mo also has an influence on the type and number of CN walls formed. Alt
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/02/2010
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7. Effect of Mo concentration and aging time on the magnetic and mechanical hardness of Fe-xMo-5Ni-0.05C alloys (x = 5, 8, 11 and 15 wt. (%))
Changes to the microestructure during thermal aging treatment at 610 ºC in Fe-xMo-5Ni-0.05C alloys were studied for different aging times with different Mo concentrations. The heat treatment at 610 ºC induces carbide precipitation into the metallic matrix near Fe2Mo phase. The X-ray diffraction studies revealed a more intense precipitation of α-FeMo, Fe3M
Materials Research. Publicado em: 2009
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8. Influência de parâmetros microestruturais no comportamento tribológico de ligas ferrosas multicomponentes / Influence of microstructural parameters on the tribological behavior of multicomponent ferrous alloys
The aim of this work is to evaluate the effect of microstructural parameters (eutectic carbides and matrix hardness) of multi-component ferrous alloys on tribological behavior in sliding wear and micro-abrasive wear. The samples were two series of alloys with variable vanadium (V serie) and molybdenum (M serie) contents and fixed amounts of other elements. E
Publicado em: 2007
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9. Filmes intermediários para deposição de diamantes CVD sobre aços / Intermediate films for diamond deposition on steel
The present work is inserted in the area of Chemical Vapor Deposition of Diamond thin and freestanding films. The CVD diamond deposition on steel substrates is still a great challenge to overcome. Iron-like materials present negative effects for the CVD diamond growth process, as catalytic effects in the preferential nucleation of the graphitic phase and hig
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/08/2006
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10. Síntese e caracterização do carbeto de molibdênio nanoestruturado para fins catalíticos na reação de oxidação parcial do metano
Os materiais nanoestruturados são caracterizados por terem um tamanho de cristalito inferior a 100 nm podendo atingir 1 nm. Devido às dimensões extremamente reduzidas dos cristalitos, as propriedades destes materiais são significativamente modificadas relativamente às dos materiais convencionais. No presente trabalho foi realizado um estudo de síntese
Publicado em: 2006
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11. Determinação de Co, Cu, Fe, Mn e Mo em tantalo com alta pureza usando espectrometria por absorção atomica em forno de grafite
The graphite furnace atomic absorption spectrometry was used as a technique in the determination of the elements cobalt, copper, iron, manganese and molybdenum in tantalum with high purity. In the first stage of this work, the analytical determinations were carried out in the presence of the tantalum matrix. The analytical behavior of the elements of interes
Publicado em: 1999
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12. Efeitos de carbono, cromo e molibdenio na solidificação de ferros fundidos brancos com alto teor de cromo
The ternary Fe-Cr-C diagrams, as applied to the of high Cr white Cast Iron, were reviewed. Solidification A model was proposed for the solidification sequence .and for the main microconstituints characteristics of these alloys containing or not molybdenun.Solidification experiments were performed on 30 mm diameter samples. The austenite and eutectic arrest t
Publicado em: 1986