Magnesium cerium

Magnesium cerium(III) nitrate, 3Mg(N03)2-2Ce(N03)3-24H20, separation of praseodymium from lanthanum by, 2 57 Magnesium chloride, anhydrous, 1 29 5 154n. 6 9 Magnesium cyclopentadienide, 6 11 Magnesium rare earth nitrates,... 

Mixed oxide samples were prepared by the co-precipitation from aquatic solutions of the cations ([Ce(IV)] = 0.1 M) by adding equal volume of 1 M NHj solution under controlled conditions. Further calcium cerium mixed oxide samples were prepared by the incipient wetness method, for comparison. The solid phase was heated to dryness, in an oven at 250 C. Samples of magnesium cerium and calcium cerium mixed oxide prepared by co-precipitation were subsequently calcined at 400, 600 and 800 "C. 

Figure 1. Wet air oxidation. Magnesium-cerium catalysts with different mass ratios as defined above. Conversion of phenol as a function of time.

Lithium, magnesium, cerium, and cobalt derivatives of diethyl difluoromethylphosphonate readily react with a large variety of carbonyl compounds to give 2-hydroxy-1,1-difluoroalkyIphosphonates in good yields (46-99%, Scheme 3.79) after acidic workup. Aliphatic, 77,40i,528-53i matic,2 5 ° 5 2-5 " heteroaromatic, 277.61" oc,P-unsaturated227,535 aldehydes as well as cyclic, oc,P-unsaturated,525,536 gnd ethoxycarbonyl-substitutcd" " ketones have been used successfully. The presence of lithium salts in the solution increases the stability of the difluorinated carbanion.277... 

As sodium can be used to eliminate impurities contained in metals, one could consider it as a means for producing wanted compounds and alloys. This field of application is rather large and the following cases of alloy production, mainly based on the strong halogen affinity of this metal, may be examined alkaline earth metal alloys, calcium sodium alloys and calcium metal derived from them, and sodium alloys, especially those with potassium, when calcium, magnesium, cerium, aluminum, uranium, thorium, and titanium, for instance, are introduced into a base metal. 

Magnesium cerium(III) chloride Synthesis of alkoxylamines from alkoximes with asym. induction Chiral a-(alkoxylamino)ketals... 

The linear rate suggests the rate-controlling step is simply the reaction of metal with oxygen. Any corrosion product or scale formed is generally assumed to be non-protective, due to its porous, non-adherent, powdery, or volatile structure. In some cases, the corrosion product may even be a liquid. Overall reaction rates may be veiy fast up to and including ignition. Magnesium, cerium, and lanthanum are typical examples of pure metals that exhibit linear oxidation rates over a wide variety of conditions. 

In 1970 Friedrich et al. (24) reached the following conclusion "The determination of nitrogen in tantalum using the nickel-magnesium-cerium technique is possible if the nickel. -tantalum ratio is above 8 1. It has still not been possible to find a method suitable for the determination of nitrogen in niobium". 

The nickel-magnesium-cerium technique involves the following vacuum procedure, which originates from Kraus and Paesold (25) the sample is introduced into the reaction furnace at 1200°C simultaneously with 1.5 to 2 g nickel, 0.03 g magnesium and sufficient nickel-cerium master alloy to give a concentration of 1 % cerium in the melt. The temperature is then raised to 1700°C. 

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