Thermally-assisted milling and hydrogenolysis for synthesizing ultrafine MgH2 with destabilized thermodynamics.

Authors :: Huang, L J
Shi, S T
Cui, J
Liu, J W
Ouyang, L Z
Wang, H
Source :: Nanotechnology; 7/9/2021, Vol. 32 Issue 28, p1-7, 7p
Publication Year :: 2021
Abstract: A novel process has been developed to synthesize MgH<subscript>2</subscript> nanoparticles by combining ball milling and thermal hydrogenolysis of di-n-butylmagnesium (C<subscript>4</subscript>H<subscript>9</subscript>)<subscript>2</subscript>Mg, denoted as MgBu<subscript>2</subscript>. With the aid of mechanical impact, the hydrogenolysis temperature of MgBu<subscript>2</subscript> in heptane and cyclohexane solution was considerably lowered down to 100 °C, and the MgH<subscript>2</subscript> nanoparticles with an average particle size of ca. 8.9 nm were obtained without scaffolds. The nano-size effect of the MgH<subscript>2</subscript> nanoparticles causes a notable decrease in the onset dehydrogenation temperature of 225 °C and enthalpy of 69.78 kJ mol<superscript>−1</superscript> · H<subscript>2</subscript>. This thermally-assisted milling and hydrogenolysis process may also be extended for synthesizing other nanomaterials. [ABSTRACT FROM AUTHOR]

Subjects :: HYDROGENOLYSIS
THERMODYNAMICS
IMPACT (Mechanics)
CATALYTIC dehydrogenation
BALL mills
HEPTANE

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