Nickel phosphates

Nickel Phosphate. Tri nickel orthophosphate [14396-43-17, Ni2(P0 2 7H20, exists as apple-green plates which decompose upon heating. It is prepared by the reaction of nickel carbonate and hot dilute phosphoric acid. Nickel phosphate is an additive to control the crystal size of ziac phosphate ia coaversioa coatiags which are appHed to steel prior to its being paiated (see Metal surface treatments). 

It is thus likely that the carbon coating on the alumina support lessened the interaction between AI2O3 and P and inhibited the formation of nickel phosphate after calcination and also lowered the reduction temperature. Structural models of the supported Ni2P catalysts are shown in Figure 4. 

Nickel phosphate (3Ni + 2P —> Ni P ) is a greenish powder used in electroplating. 

Major constituents (greater than 5 mg/L) Minor constituents (O.Ol-lO.Omg/L) Selected trace constituents (less than 0.1 mg/L) Bicarbonate, calcium, carbonic acid, chloride, magnesium, silicon, sodium, sulfate Boron, carbonate, fluoride, iron, nitrate, potassium, strontium Aluminum, arsenic, barium, bromide, cadmium, chromium, cobalt, copper, gold, iodide, lead, Uthium, manganese, molybdenum, nickel, phosphate, radium, selenium, silver, tin, titanium, uranium, vanadium, zinc, zirconium... 

Nickel phosphate is used in coating steel and in treatment of metal surfaces. It also is used to prepare the pigment, nickel yellow for oil and water colors. The compound is used in electroplating also. 

Nickel phosphate heptahydrate is obtained as a pale green flocculent precipitate when disodium hydrogen phosphate, Na2HP04 is added to a nickel salt solution. The precipitate is air-dried. 

Fig. 6.1.7 TEM pictures of nickel phosphate particles, (a) before and (b) after being calcined at 600°C for 2 h.

Fig. 6.1.8 Pore size distribution of uniform spherical nickel phosphate particles treated at various temperatures (a) in vacuo and (b) in air.

Write the formulas for the following ionic compounds (a) lithium hydride (b) calcium bromate (c)chromium(II) oxide id) thorium(IV) perchlorate (e) nickel phosphate if) zinc sulfate. 

The straight-chain 1- and 2-butenes are preheated to 600°C in a furnace, mixed with steam as a diluent to minimize carbon formation, and passed through a 5-m-diameter reactor with a bed of iron oxide pellets (or calcium nickel phosphate) 90 to 120 cm deep (contact time 0.2 second) at 620 to 750°C. The material is cooled and purified by fractional distillation and extraction with solvents such as furfural, acetonitrile, dimethylformamide (DMF), and N-mcthyIpyro11idonc (NMP) (Fig. 2). 

S. Nie, Y. Hu, L. Song, S. He, and D. Yang, Study on a novel and efficient flame retardant synergist nanoporous nickel phosphate VSB-1 with intumescent flame retardants in polypropylene, Polym. Adv. Technol., 2008, 19 489 195. 

Fig. 18.7. The nickel phosphate VSB-1. NiOs octahedra are shown in gray and PO4 tetrahedra are represented in light gray. Water molecules, extra-framework cations, and partial occupancy are omitted for clarity.

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