Ferric aluminate

Fe Oj coatings, 40 105 FejOj/y-AljOj, MSssbauer spectra, 37 30 FCjOj-I catalyst, 37 181-183 FcjOj superacid, 37 199-201 Fermi distribution, 34 228 Fermi energy, 27 217 Fermi golden rule, 34 243 Fermi level, 27 4, 5 Fermi s Golden Rule, 35 19-20 Ferric aluminate as catalyst, 20 109-112 chemical structure and catalytic activity of, 20 111, 112... 

Shallow sediments under conditions of low sedimentation rate can produce either glauconites or berthierine-verdine minerals. Given the miner-alogical information presented above, one can think of the glauconite/ferric-aluminous smectite mixed layered mineral series culminating in the formation of the micaeous (nonexpanding) mineral glauconite and the berthierine/smectite series... 

The catalysts (lead and copper salts of aromatic acid in combination with carbon black) which were effective for DB and RDX-CMDB propellants were also found effective for dinitropiperazine (DNP) containing CMDB propellants [259]. Copper chromite (CC) and ferric oxide which are generally used for ballistic modification of composite propellants are also effective for CL-20-based aluminized CMDB propellants. However, CC is a better BRM [260]. 

The same is true for the micas. However aluminous and ferric clay minerals do exist. It is apparent then that some point of divergency will be reached where aluminous systems will contain one set of phases and ferric systems, under the same physical conditions, will form another. Here... 

Figure 17. Proposed phase relations where K is a mobile component and Al, Fe are immobile components at about 20°C and several atmosphere water pressure for aluminous and ferric-ferrous mica-smectite minerals. Symbols are as follows I illite G = non-expanding glauconite Ox = iron oxide Kaol = kaolinlte Mo montmorillonite smectite N nontronitic smectite MLAL aluminous illite-smectite interlayered minerals Mlpe = iron-rich glauconite mica-smectite interlayered mineral. Dashed lines 1, 2, and 3 indicate the path three different starting materials might take during the process of glauconitization. The process involves increase of potassium content and the attainment of an iron-rich octahedral layer in a mica structure.

Any precipitated sulphides being removed by filtration, the filtrate is boiled to expel hydrogen sulphide, then oxidised with a few drops of concentrated nitric acid and boiled with ammonium chloride and ammonia. The liquid is then filtered and the precipitate carefully washed with hot water and dissolved in dilute nitric acid, the nitric acid solution being treated with excess of sodium hydroxide, boiled for a few minutes and filtered when cold. Any ferric and chromium hydroxides remain on the filter, the filtrate containing the alumina as sodium aluminate. If the filtrate is heated to boiling with ammonium chloride, an abundant precipitation of gelatinous white flocks will occur in the case of a sample dyed on an aluminium mordant. 

Reasoning by analogy, it would appear not unlikely that native oxides, such as alumina (corundum, ruby, sapphire), or iron sesquioxide (haematite), may be in reality an aluminate of alumina, A1(A102)3, or ferric ferrite, Fe(Fe02)3.. . ... 

The hydrothermal synthesis of the faujasites was carried out at 373 K in stainless steel autoclaves in static condition. The faujasites were synthesised using seeds of an aluminium ferri-silicate gel. 16 g of the homogeneous seed slurry (aged for 24 hrs at room temperature) was added to an aqueous gel mixture containing sodium silicate (86.8 g) sodium aluminate (5.6 g) aluminium sulphate (7.5 g) and ferric... 

The chromous salts, derived from the oxide CrO, arc analogous to the salts of divalent vanadium, manganese, and iron. This is seen in the isomorphism of the sulphates of the type R" SOj-THgO. The stability of such salts increases in the order of the atomic number of the metal. The chief basic oxide of chromium is the sesquioxidc CraO, which is closely allied to ferric oxide, and, like the latter, resembles aluminium oxide. The hydroxide, Cr(OH)3, with bases yields chromites analogous to, but less stable than, the aluminates. Chromic sulphate enters into the formation of alums. The chromic salts are very stable, but in the trivaJent condition the metal shows a marked tendency to form complex ions, both anions and cations thus it resembles iron in producing complex cyanides, whilst it also yields compounds similar to the cobaltamines. 

In general, the minerals now identified as chamosite are found in iron ore bodies of sedimentary origin (e.g., Maynard, 1986 Fernandez and Moro, 1998 Wiewora et al, 1998 Kim and Lee, 2000). Chamosite associated with iron oxides appears to follow a compositional trend from iron oxides plus kaolinite to chlorite, as indicated in Figure 8, using the data of Velde (1989). The recombination of iron oxide in the presence of kaolinite gives an aluminous, ferrous mineral, chamosite. This mineral is formed under burial conditions where ferric iron oxide is reduced to feiTous iron which is rapidly incorporated into a 7 A chlorite mineral. Both chamosite and berthierine result from the reduction of ferric iron to ferrous iron. 

Sodium Xylene Sulfonate Xylidine Copper Gluconate Sodium Aluminate Calibre 302-6 Arsenic Trisulfide Boric Oxide Boron Trioxide Barium Oxide Barium Peroxide Beryllium Oxide Bismuth Subnitrate Calcium Hydroxide Lime Water Calcium Oxide Calcium Peroxide Cadmium Oxide Cadmium Sulfide Chromic Hydroxide Chromic Oxide Ferric Hydroxide Rouge... 

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