scholarly journals MOLYBDIC OXIDE

1956 ◽  
Vol 34 (26) ◽  
pp. 3205
Keyword(s):  
Molybdic Oxide

Hydrogen reduction of molybdic oxide

JOM ◽  
1964 ◽  
Vol 16 (11) ◽  
pp. 877-884 ◽  
Author(s):  
Herbert Kay ◽  
B. G. Langston ◽  
A. B. Michael ◽  
J. E. Hanway
Keyword(s):  
Hydrogen Reduction ◽  
Molybdic Oxide

THE HYDROGENATION OF ALBERTA COALS: I. PRELIMINARY EXPERIMENTS ON SUSPENSION MEDIA AND CATALYSTS WITH THREE COALS

1935 ◽  
Vol 12 (6) ◽  
pp. 825-839 ◽  
Author(s):  
E. H. Boomer ◽  
A. W. Saddington
Keyword(s):  
Controlling Factor ◽  
Chromium Oxides ◽  
Hydrogen Carrier ◽  
Molybdic Oxide

The action of five suspension media and various catalysts in the hydrogenation of coal has been investigated. It has been shown that the Alberta coals used may be hydrogenated successfully. The properties of the medium have been found to be a controlling factor in the process. The effectiveness of the different media varied with the ease with which they could be hydrogenated and dehydrogenated. Tetrahydronaphthalene was found to be much superior to other media, and showed a greater effect than could be attributed to any of the catalysts used. Experiments showed that this compound was effective because of its action as a hydrogen carrier. Of the catalysts used, molybdic oxide and a mixture of iron and chromium oxides were most effective. The details of the reactions are discussed briefly.

EXPERIMENTS ON THE PYROLYSIS OF GASEOUS PARAFFINS, WITH SPECIAL REFERENCE TO THE PRODUCTION OF ETHYLENE

1932 ◽  
Vol 7 (6) ◽  
pp. 646-661 ◽  
Author(s):  
Adrien Cambron
Keyword(s):  
Natural Gas ◽  
Special Reference ◽  
Silica Tube ◽  
Unsaturated Hydrocarbons ◽  
Liquid Products ◽  
Wire Gauze ◽  
Molybdic Oxide ◽  
Solid Hydrocarbons ◽  
Tungsten Spiral ◽  
Pyrex Tube

On passing natural gas, containing 4.8% ethane, through an electrically heated tungsten spiral, the formation of liquid products was observed at 1050 °C.On passing the same gas over an electrically heated 4-mm. carbon rod enclosed in an uninsulated silica tube 2.0 cm. wide, 7.7% of the gas was converted to liquid and solid hydrocarbons at a rod temperature of 1050–1100 °C. No liquids or solids except carbon were formed when the silica tube was insulated.By replacing the 2.0-cm. silica tube by a water-cooled Pyrex tube, 3.2 cm. wide, no liquid or solid hydrocarbons were obtained, but 17% of the gas was converted to gaseous unsaturated hydrocarbons at 993 °C. On passing ethane through the 3.2-cm. water-cooled reaction tube at rod temperature of 989 °C., 50.5% of the entering gas was converted to ethylene, and 90.0% of the ethane decomposed did so according to the equation C2H6 → C2H4 + H2.The dehydrogenation of ethane was found to be greatly accelerated by the presence of reduced copper in the tube, the metal being used in the form of a cylindrical wire gauze and placed around the carbon rod. Copper bronze coated with molybdic oxide was also found to be active under the same conditions.

scholarly journals Treatment of Molybdenite Ore Using a 2 kw Solar Furnace

1979 ◽  
Author(s):  
S. R. Skaggs ◽  
J. P. Coutures
Keyword(s):  
Department Of Energy ◽  
Solar Furnace ◽  
Reaction Products ◽  
Crossover Point ◽  
Cooperative Effort ◽  
Organic Vapors ◽  
The Us ◽  
Temperature Ranges ◽  
Scientific Laboratory ◽  
Molybdic Oxide

Hydrometallurgical methods of extracting molybdenite (MoS2) from the raw ore consume 145 × 106 Btu ton of fossil fuel equivalent energy per ton of concentrate produced. Processing the ore using a solar heat source could save 56 percent of this energy. Thermodynamic considerations indicate that MoS2 is the easiest of the economically valuable ores to extract. If the technique can be developed with this ore, it may be possible to extend it to other ores. Oxidation of the sulfide to molybdic oxide (MoO3) is an exothermic process, and it should proceed autogenically if the concentration of MoS2 is high enough. Experiments to measure the specific heat of the raw ore were conducted to determine the crossover point for this autogenic reaction. Using a calorimeter, we found three distinct reaction temperature ranges corresponding to water and organic vapors, oxidation of pyrite (FeS2), and oxidation of molybdenite. The production rate of SO2 was measured for 0.5-g samples of three different concentrations of molybdenite: (a) 95 percent MoS2 concentrate, (b) 10 percent concentrate in the raw ore, and (c) the unadulterated raw ore. A crude mass balance was obtained between the reaction products and the unreacted ore in the hearth. The curves of reacted product wersus time look very similar to the curves of SO2 gas produced versus time. Both sets of curves show the reaction is more than 90 percent complete in one minute. This work is sponsored by the US Department of Energy and the French Center Nationale de Recherche Scientifique. It is a cooperative effort of the Los Alamos Scientific Laboratory in the US and the Laboratoire des Ultra-Refractaires and the Laboratoire d’Energetique Solaire in Odeillo, France.

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