Vanadium Study
Mostrando 1-12 de 32 artigos, teses e dissertações.
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1. Obtainment of a new metal matrix composite from the recycling of UNS S31803 duplex stainless steel by powder metallurgy
Abstract The purpose of circular economy is to maximize resources efficiency. With the increase in consumption of raw materials, energy and waste generation, recycling is necessary for environmental and industrial reasons. Thus, the powder metallurgy, together with mechanical milling, stands as a new method for scraps recycling. This study aimed to produce U
REM - International Engineering Journal. Publicado em: 2022
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2. Analysis of the densification of a composite obtained by sintering process of aluminum bronze powders with different carbides
Abstract Aluminum bronze alloy is applied in environments that require materials of high mechanical resistance and wear, such as marine, oil & gas and aerospace ones. This study analyzes the densification of composites based on aluminum bronze with additions of the vanadium (VC) and niobium (NbC) carbides, and the influence of these carbides in the milling e
REM, Int. Eng. J.. Publicado em: 19/06/2019
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3. Comparative analysis of niobium and vanadium carbide efficiency in the high energy mechanical milling of aluminum bronze alloy
Abstract This study aims to analyze the efficiency of niobium and vanadium carbides in the high energy mechanical milling of aluminum bronze alloy. Two series of experiments were made following the same steps for both niobium carbide (NbC) and vanadium carbide (VC) additions: 30 g of chips were weighed and placed in a stainless steel jar with 3 % of carbide
REM, Int. Eng. J.. Publicado em: 2018-03
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4. Electroremediation of deactivated catalysts from fluidised catalytic cracking for vanadium removal - the effect of a dual cathode chamber reactor
Abstract The aim of this study was to evaluate the quantity of vanadium removed through electrokinetic remediation applied to catalyst waste used in a fluid catalytic cracking process. In excess, vanadium affects process efficiency by reducing the catalyst’s activity, causing deactivation and reducing its useful life in petroleum cracking during refining.
Braz. J. Chem. Eng.. Publicado em: 2018-01
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5. FTIR study of aquamarines after gamma irradiation, heat treatment and electrodiffusion
Abstract Beryl, Be3Al2(SiO3)6, is a natural gemstone with many colors. Some of these colors can be induced or modified by exposure to ionizing radiation, by heating, and maybe by electrodiffusion. Small contents of chromophore chemical elements are related to the colors of beryl, like iron, chromium, vanadium, manganese, and others. There is great interest i
REM, Int. Eng. J.. Publicado em: 2017-09
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6. Essential minerals and inorganic contaminants (barium, cadmium, lithium, lead and vanadium) in dried bee pollen produced in Rio Grande do Sul State, Brazil
Abstract Like other beehive products, such as honey, royal jelly and propolis, bee pollen has attracted great interest because of the health benefits it can provide when consumed. Bee pollen has high contents of sugars and proteins and a low content of lipids, it is also a rich source of vitamins and other bioactive compounds, which makes it an attractive mi
Food Sci. Technol. Publicado em: 03/06/2016
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7. ACIDIC REMOVAL OF METALS FROM FLUIDIZED CATALYTIC CRACKING CATALYST WASTE ASSISTED BY ELECTROKINETIC TREATMENT
AbstractOne of the main uses of catalysts in the oil industry is in the fluidized catalytic cracking process, which generates large quantities of waste material after use and regeneration cycles and that can be treated by the electrokinetic remediation technique, in which the contaminant metals are transported by migration. In this study, deactivated FCC cat
Braz. J. Chem. Eng.. Publicado em: 2015-06
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8. Síntese, caracterização e estudos das propriedades catalíticas de compostos formados por óxido de tungstênio e pentóxido de vanádio / Synthesis, Characterization and Study of Catalytic Properties of Compounds Formed by Tungsten Oxide and Vanadium Oxide.
Métodos de síntese que viabilizam a obtenção de compósitos contendo xerogéis de óxido de tungstênio e de pentóxido de vanádio pelo método sol-gel foram investigados, bem como a caracterização e propriedades catalíticas nas reações de epoxidação destes materiais. Brometo de cetiltrimetilamina e hexadecilamina foram intercalados nos xerogéis
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 11/11/2011
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9. Produção de ferro-gusa e escória vanadífera a partir de rejeitos da Mineração Caraíba
This investigation addressed the recovery of magnetite and vanadium pentoxide disposed at Mineração Caraiba SA (MCSA) tailings pond via a route comprising magnetic separation and pirometallurgy aiming at achieving the products pig iron and vanadiferous slag. MCSA´s tailings pond extends at approximately 700 ha and holds 71 million tons of tailings contain
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 03/12/2010
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10. METROLOGICAL VALIDATION OF A METHOD FOR DETERMINATION OF VANADIUM IN HUMAN SERUM / VALIDAÇÃO METROLÓGICA DE UM MÉTODO PARA DETERMINAÇÃO DE VANÁDIO EM SORO HUMANO
Although the role of vanadium in the body has not been yet well defined, it is known that it inhibits the ATPase activity in erythrocytes and renal tubular cells, affecting the diuretic function of the kidneys, the metabolism of leukocytes and macrophages, the function of the heart muscle and causes insulin-like effects in pharmacological doses. Vanadium is
Publicado em: 2010
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11. Síntese e caracterização de catalisadores VOx/Nb2O5/Al2O3 para a reação de desidrogenação oxidativa de parafinas lineares / Synthesis and characterization of VOx/Nb2O5/Al2O3 catalysts for oxidative dehydrogenation reaction of linear paraffins
The use of niobium oxide as a promoter and as a support has been investigated in various catalyst applications, such as selective oxidation, hydrocarbonate conversion, polymerization, elimination of (NOx) pollutants, dehydrogenation, etc. It is known that adding niobium to γ-Al2O3 improves acidity, selectivity and thermal stability and consequently the
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/03/2009
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12. Synthesis and structural analysis of Urânium and Vanadium whit piridoxine derivated ligands. / Síntese e análise estrutural de complexos de Urânio e Vanádio com ligantes derivados da piridoxina.
Uranyl and vanadyl complexes with ligands with oxygen and nitrogen donors atoms have been extensively reviewed and aroused remarkable interest on account their high stability but, a few complexes of piridoxine derived ligands have been reported in the literature. This lack was the inspiration to search new piridoxine derived ligands and uranyl and vanadyl co
Publicado em: 2009