7704-99-6 Usage
Chemical Properties
Gray-black metallic powder. Stable
toward air and water.
Physical properties
Grayish-black powder; density 5.60 g/cm3; stable in water; soluble in dilute hydrofluoric acid; soluble in concentrated acids.
Uses
Different sources of media describe the Uses of 7704-99-6 differently. You can refer to the following data:
1. Zirconium Hydride, ZrH2, is a brittle, metallicgray solid that is stable in air and water, and has a density of 5.6 g/cm3. The chemical properties of ZrH2 closely resemble those of titanium hydride. Commercial uses are as a getter in the manufacture of vacuum tubes and other systems; as a hydrogen source for foaming metals; as a hydrogen reservoir; for the introduction of zirconium into powdered alloys; for metal–ceramic and metal–metal bonding; as a moderator in nuclear reactors; and as a source of Zr metal powder and alloys.
2. Zirconium hydride is a powerful reducing agent in acid solution or at high temperatures; hydrogenation catalyst; in the vacuum tube industry.Also, it is used as a source of pure hydrogen and a catalyst in hydrogenation reactions. Some other applications are in powder metallurgy; as a moderator in nuclear reactors; and as a metal-foaming agent
3. Zirconium(II) hydride (ZrH2) can be used as a precursor for:?Reactive hot-pressing synthesis of Zr2SC ceramics by displacement reaction with the mixture of ZrC and ZrS2.,·??The synthesis of Mg-Zr hydrides by treating with MgH2 for hydrogen storage.??????? The preparation of layer structured β-zirconium nitride chloride (ZrNCl) by reacting with NH4Cl.
Definition
Contains 1.7–2.1% combined hydrogen which can
be driven off in a vacuum above 600C.
Preparation
Zirconium hydride may be prepared by heating zirconium oxide with magnesium in the presence of hydrogen: ZrO2 + 2Mg + H2 → ZrH2 + 2MgO Alternatively, hydride may be made by heating zirconium oxide with calcium hydride in the presence of hydrogenHydride also may be obtained by combining zirconium metal with hydrogen at elevated temperature.
Production Methods
Zirconium hydride in powder form was produced by the reduction of zirconium oxide with calcium hydride in a bomb reactor. However, the workup was hazardous and many fires and explosions occurred when the calcium oxide was dissolved with hydrochloric acid to recover the hydride powder. With the ready availability of zirconium metal via the Kroll process, zirconium hydride can be obtained by exothermic absorption of hydrogen by pure zirconium, usually highly porous sponge. The heat of formation is 167.4 J/mol (40 kcal/mol) hydrogen absorbed.
General Description
This product has been enhanced for energy efficiency.
Hazard
Flammable, dangerous fire risk, especially
in the presence of oxidizers.
Flammability and Explosibility
Flammable
Safety Profile
A powerful reducing
agent. Flammable when dry or wet. Very
dangerous to handle; can explode.
Incandesces when heated in air. See also
HYDRIDES and ZIRCONIUM
COMPOUNDS.
Check Digit Verification of cas no
The CAS Registry Mumber 7704-99-6 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 7,7,0 and 4 respectively; the second part has 2 digits, 9 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 7704-99:
(6*7)+(5*7)+(4*0)+(3*4)+(2*9)+(1*9)=116
116 % 10 = 6
So 7704-99-6 is a valid CAS Registry Number.
InChI:InChI=1/Zr.4H/rH4Zr/h1H4
