Cerium sulfides

Sulfides. Several cerium sulfides have been characterized (12) including the expected cerium (ITT) sulfide [12014-93-6] Cerium... 

The first compound of this series, CeSI, was reported by Carter (68) in 1961, and later discussed by Dagron (93). It was obtained by the reaction of iodine with cerium sulfide at 430 C, or by direct synthesis from the elements at 500°C. This was the start of a detailed investigation of this group of compounds mainly by Dagron and co-workers. The present situation is presented in Table VII. No scandium compounds are known thus far, and the same is true for selenium and tellurium halides of these elements. 

It forms cerium(II) hydride, CeHa, when heated under hydrogen. Reaction with HaS yields cerium sulfide, CeaSs. 

When H2S is passed into the solution cerium sulfide is precipitated ... 

Cerium sulfide pigments are produced from hydrated cerium oxide or oxalate and calcined in an oxygen-free, sulfide environment. They are silica-encapsulated to minimize water-reactivity and to improve heat stability and chemical resistance properties. Because of their low relative value-in-use, they are used primarily in engineering plastics and in particular the polyamides where high-performance organic colorant alternatives and other inorganic pigment alternatives are few. 

Sulfide and sulfoselenide pigments cadmium sulfose- lenide cerium sulfide cadmium sulfide, (Cd, Zn)S ... 

Ceria Cerium Sulfate Cerium Sulfide Supported-Metal Catalysts Oxygen-Storage Capacity Water-Gas Shift Steam Reforming SO2 H2S. 

Ce2S3 CERIUM SULFIDE 522 Cr3C2 3-CHROMIUM 2-CARBIDE 560... 

Until recently, cadmium red was the preferred choice of red pigment for containers, toys, and household items, replacing pigments derived from toxic heavy metals such as lead and mercury, but cadmium is now considered totally undesirable and its pigments are being phased out, probably to be replaced with cerium sulfide, which gives a rich red colour, is stable up to 350 °C, and is completely non-toxic. 

Yellow and orange Cadmium sulfide produces orange-yeUow or similar shades when combined with zinc or selenium, but it contains the problematic heavy metal and is mainly used in engineering applications. Lead chromate produces bright yellows, but is light-sensitive and must be treated. Lead chromate, sulfite, and molybdate combined can create a stable orange color. Newer non-toxic compounds based on rare earth elements, such as cerium sulfide, reportedly offer the same shades as toxic chromates. 

Cerium Orange PO 75. See Cerium sulfide Cerium oxide... 

Cerium trisulfide. See Cerium sulfide Ceroi ZN. See Paraffin Cerotic acid... 

Neolor Cerium Orange, Neolor Cerium Red. See Cerium sulfide... 

Cerium sulfide Cobalt aluminum oxide D C Red No. 7 Flavanthrone Indanthrone Iron oxide black Iron oxide brown Iron oxide red Iron oxide yellow Iron oxide yellow monohydrate... 

It was Carl Gustaf Mosander (Figure 17.8), from 1836 Berzelius successor as professor of chemistry, who started the great work of separating the almost inseparable. As Berzehus student from 1820 he soon came into his service. He prepared cerium sulfide and let it react with chlorine. Anhydrous cerium chloride CeClj, was formed, from which he prepared metalHc cerium by reduction with potassium metal. This was in about 1825. With all his work with different cerium compounds he began to... 

Cadmium sulfide, cadmium red, has been popular as a red pigment for household wares and toys. The use of toxic cadmium is, however, no longer allowed for these purposes. It may be replaced by cerium sulfide CeSj, giving a rich red color that is completely non-toxic. A range of colors can be obtained if traces of other lanthanides are added. 

Cerium Sulfide Light Orange Ce2S3/La2S3 PO 78 C.I. 772850 12014-93-6 / 12031-49-1... 

Rare earth elements and sulfur combine to form a wide range of compounds as sulfides or oxysulfides Among them, sesquisulfides appeared to have the best potential as far as color is concerned (Table 4—1). We gave most of our attention to cerium sulfide, which was the most promising in terms of color intensity and purity. 

Cerium sulfide pigments are prepared in three steps (Figure 4—7) ... 

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