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Magnesium spinel

Baudin C, Martinez R, Pena P (1995) High temperature mechanical behaviour of stoichiometric magnesium spinel. J Am Ceram Soc 78(7) 1857-1862... [Pg.210]

Veremeichik, T. F. (1973) Optical absorption spectra of excited Cr3+ ions in magnesium spinel at room and liquid nitrogen temperatures. Opt. Spektrosk., 35, 102-7. [Pg.517]

The chapters in Characterization and Catalyst Development An Interactive Approach, assembled from both academic and industrial contributors, give a unique perspective on catalyst development Some chapters thoroughly characterize the catalyst prior to plant evaluation, whereas others utilize characterization to explain performance variances. Some new types of catalysts incorporated into this volume include the preparation of novel catalyst supports based on alumina and hydrous titanates. Attrition-resistant catalysts and ultrafine ceramics were prepared by modified spray-drying methods. New catalyst compositions based on vanadium-containing anionic clays were proposed for oxidation. A recently commercialized catalyst based on magnesium spinel was proposed for use in the abatement of sulfur oxide pollutants in fluid... [Pg.7]

The high magnesium spinel, Mg2Al205, can be synthesized following the same procedure and using the required amounts of Mg(N03).6H20 and NaA102. Anal. [Pg.54]

Co-gel formation. In addition to the co-precipitation of the two hydroxides we have found that a very homogeneous mixture of Mg2+ and Al3+ species can be obtained by co-gel formation (8). This co-gel, usually prepared by combining aqueous slurries of psuedoboehmite alumina, high surface area MgO, and an acid, is dried and calcined at 700 to 800°C to produce both stoichiometric and high magnesium spinels (reaction 4). [Pg.58]

It is very apparent from this work that coprecipitation and co-gel formation methods for the preparation of spinels provide very active catalysts for FCC SOx reduction whereas the co-condensation method produces very dense ceramic type spinels with low activity. The high magnesium spinel catalyst is more active than the stoichiometric spinel catalyst. [Pg.60]

Other binary aluminates include magnesium spinels that are used extensively as castable refractory ceramics. Lithium aluminates are used, potentially, in fuel cells and as materials for new types of nuclear reactors. Again, these applications reflect the refractory nature of aluminates and their chemical resistance. [Pg.66]

MgO occurs first of all in pleochroite, but it can form the solid solutions with the other phases, however, in very low concentration. Talaber [10] mentions also that the formation of akermanite and magnesium spinels is possible too. [Pg.606]

Sillimanite, see Aluminum silicon oxide (1/1) Smithsonite, see Zinc carbonate Soda ash, see Sodium carbonate Spelter, see Zinc metal Sphalerite, see Zinc sulflde Spherocobaltite, see Cobalt(II) carbonate Spinel, see Magnesium aluminate(2—)... [Pg.275]

Forsterite. Pure forsterite is rare in nature. Most natural magnesium orthosiUcates form soHd solutions of fayaUte, Fe2Si04, and forsterite. Forsterite refractories are usually made by calcining magnesium siUcate rock such as dunite, serpentine, or oHvine with sufficient magnesia added to convert all excess siUca to forsterite and all sesquioxides to magnesia spinels. [Pg.26]

It is for this reason that we write the solid state diffusion reaction for the magnesium aluminate spinel as follows ... [Pg.161]

In these soak (300°C)-ramp (up to 900°C) /min) mode tests, a O.lOg of sulfated DESOX sample—the leading catalyst based on magnesium aluminate spinel with an excess MgO catalyzed with Ce and V oxides [9]—was allowed to react with either Hj (5%)/Ar (50 ml/min), undiluted H (70 ml/min) or CH (14 ml/min). [Pg.138]

In the OH series, two phases were detectable by XRD in the dried precipitate. One was a phase with the pyroaurite structure, carbonate having presumably arisen from atmospheric CO2, and the other brucite, Mg(OH)2, 0 which pyroaurite is closely related structurally. For both the CCP and IP series, the only structure identifiable in the dried precipitate was that of magnesium hydroxy carbonate. X-ray analysis of the calcined precursors showed MgO together with y-Fe203 in the case of the OH series and HT, but -Fe203 with the CCP and IP series. MgFe204 spinel was also detectable in some cases. [Pg.260]

At high temperatures the spinel MgAl204 can take in excess alumina to a composition of approximately 70 mol% A1203 (Fig. 4.5). (a) What are the possible formulas that fit the composition of this spinel Write the defect formation equation for the reaction if the excess A1 is (b) distributed over both magnesium and aluminum sites and (c) only over aluminum sites. Assume that there is no electronic compensation in the insulating oxide. [Pg.201]

Chromium iron manganese brown spinel, formula and DCMA number, 7 348t Chromium iron nickel black spinel, formula and DCMA number, 7 348t Chromium isotopes, 6 476 Chromium magnesium oxide, 5 583 Chromium manganese zinc brown spinel, formula and DCMA number, 7 348t Chromium-nickel alloys, 77 100-101 Chromium-nickel-iron alloys, 17 102-103 Chromium-nickel stainless steels, 15 563 Chromium niobium titanium buff rutile, formula and DCMA number, 7 347t Chromium(III) nitrate, 6 533 Chromium nitride, 4 668... [Pg.184]

Iron titanates, 25 46 47 Iron titanium brown spinel, formula and DCMA number, 7 348t Iron trimer, 16 62 Ironworks, early American, 14 492 Iron/Zinc/Magnesium Oxide Tan pigment for plastics, 7 369t Irradiated uranium, plutonium separation and purification from, 19 674-675 Irradiation... [Pg.493]


See other pages where Magnesium spinel is mentioned: [Pg.314]    [Pg.314]    [Pg.81]    [Pg.52]    [Pg.49]    [Pg.54]    [Pg.60]    [Pg.170]    [Pg.173]    [Pg.42]    [Pg.167]    [Pg.299]    [Pg.226]    [Pg.63]    [Pg.314]    [Pg.314]    [Pg.81]    [Pg.52]    [Pg.49]    [Pg.54]    [Pg.60]    [Pg.170]    [Pg.173]    [Pg.42]    [Pg.167]    [Pg.299]    [Pg.226]    [Pg.63]    [Pg.437]    [Pg.291]    [Pg.338]    [Pg.345]    [Pg.13]    [Pg.13]    [Pg.24]    [Pg.37]    [Pg.199]    [Pg.359]    [Pg.149]    [Pg.313]    [Pg.109]    [Pg.290]    [Pg.211]    [Pg.105]    [Pg.202]    [Pg.313]    [Pg.459]   
See also in sourсe #XX -- [ Pg.424 , Pg.426 ]




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