The groundwater quality of Wadi Al Arab aquifer, northwest Jordan, was assessed for its high molybdenum concentrations, which reach 1.62 mg/L. This value of Mo-concentration was far beyond the Jordan Institution for Standards and Metrology (JISM) and World Health Organization (WHO) guidelines. Hydro-geochemical studies were carried out in order to assess the chemistry of the groundwater
Non-aqueous media: A primary method of depositing a coating of molybdenum using non-aqueous media is fused salt electrolysis, which involves a combination of a chemical reaction and an electron transfer using a reactor known as an electrochemical cell. An electric current passes from the anode through the electrolyte (the cell bath that must be
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Sep 01, 1975· An electrolytic process for molybdenum extraction in a KCl−K3MoCl4 electrolyte (containing approximately 7.5 wt pct molybdenum) was investigated using three types of anode feed —namely, molybdic oxide-graphite, molybdenum sesquisulfide-graphite, and molybdenum sesquisulfide without graphite. In the case of molybdic oxide-graphite anode, a maximum current
Dec 15, 2000· Metallic molybdenum (Moo) wires with diameters ranging from 15 nanometers to 1.0 micrometers and lengths of up to 500 micrometers (0.5 millimeters) were prepared in a two-step procedure. Molybdenum oxide wires were electrodeposited selectively at step edges and then reduced in hydrogen gas at 500°C to yield Moo. The hemicylindrical wires prepared by this technique were self
Molybdenum is among a sub group of elements that are known as refractory metals. These types of metals provide numerous metal finishing benefits. Molybdenum is relatively rare and possesses its own unique challenges when combined with other processes. Contact ENS today regarding our molybdenum coating capabilities.
Nov 01, 2008· The hydrogen production by water electrolysis was tested with different electrocatalysts (molybdenum, nickel, iron alloys containing chromium, manganese and nickel) using aqueous solutions of ionic liquid (IL) like 1-butyl-3-methylimidazolium tetrafluoroborate (BMI.BF 4). The hydrogen evolution reaction (HER) was performed at room temperature in a potential of −1.7 V (PtQRE).
Molybdenum blue reaction for the determination of orthophosphate . The molybdenum blue reaction, used predominantly for the determination of orthophosphate in environmental waters, has been pually modified and re-optimised over the years, but this important reaction in analytical chemistry is usually treated as something of a 'black box' in the analytical literature.
A great influence on the corrosion of molybdenum electrodes has the chemical composition of the melt. Since molybdenum is not a noble metal, it easily oxidizes in the presence of almost all polyvalent elements and complexes in the melt, e.g. Sb, Zn, As, Ni, Mn, Co, or Pb, which have a higher standard potential than molybdenum [7, 9-11].
used to manufacture molybdenum-alloy steel. During melting, the gangue ends up in the slag. However, tech oxide must be puriﬁed chemically to use it in the manufacture of molybdenum metal. Figure 1 is a ﬂow chart of molybdenum metal manufacturing, starting with tech oxide. The oxide is ﬁrst dissolved in ammonium or sodium hydroxide, and this
Molybdenum disulfide-based layered materials are promising electrocatalysts for hydrogen production from water electrolysis if their catalytic performance can be further improved by increasing the electrical conductivity and edge site density, and decreasing the contact resistance between the catalyst and its support. A suitable conductive scaffold can play a positive role in enhancing the
Jan 15, 2015· The electrodeposition of thick metallic molybdenum coating from aqueous electrolyte considered difficult for a long time owing to high reactivity with oxygen. In the present study, a successful attempt was made to electrodeposit thick (~ 25 μm), metallic bright Mo coating by DC electrolysis from a water deficient aqueous electrolyte containing
May 01, 2012· Highlights Electrolytic hydrogen production is examined with molybdenum-oxo catalysts in the cathode. A model of the electrolysis process is developed to predict the energy and exergy efficiencies. The system consists of two half-cells of PEM (proton exchange membrane) and alkaline electrolysis. The effects of temperature and membrane thickness are reported at varying current
Molybdenum Phosphide, Hydrogen Evolution Reaction, Catalyst, Electrolysis 1. Introduction As a clean and renewable resource, hydrogen is believed to be one of the most promising alternative energy car-riers  . Hydrogen can be generated by electrolysis or photoelectrolysis of water the viahydrogen evolution reaction (HER).
Fe/sup 59/ was added to cerium during casting and used to follow the migration of iron during solid state electrolysis. Radiotracers were used in developing special analytical techniques applicable to high-purity rare-earth metals produced by molten salt electrolysis. (auth)
OF MOLYBDENUM AND TUNGSTEN E.F.Sperenskaya, V.E.Mertsalova, and I.I.Kulev CONTENTS 1. Potentials of redox systems 2. Composition and spectrophotometry of complex com-pound^ 3. Electrolysis of solutions 4. Reduction with metals and amalgams 5. Polarography 892 894 895 897 898 Molybdenum and tungsten find widespread application in
Molybdenum phosphide (MoP) flakes were synthesized by the reduction of hexaammonium heptamolybdate tetrahydrate and ammonium dihydrogen phosphate. The flakes are porous and constructed by MoP nanoparticles with ca. 100 nm diameters. The lateral size of flakes ranges from less than 1 μm to larger than 5 μm, and the thickness of MoP fakes is ca. 200 nm.
Effect of phosphorus on the surface concentration of molybdenum and nickel in the oxide form of nickel molybdenum/alumina catalysts and on their hydrodesulphurization activity.