Abstract
By directly introducing Ni–B into NaAlH4 system using a facile two-step synthesis method, the effects of Ni–B on NaAlH4 were systematically investigated. NaAlH4 can be completely formed after 30 h milling under 1 MPa hydrogen pressure. In addition, the dehydrogenation kinetics of as-prepared NaAlH4 after different milling times were investigated. As the dehydrogenation temperature rises, both the hydrogen desorption capacity and dehydrogenation rate quickly increase. The apparent activation energy E a for Ni–B-doped NaAlH4 is calculated to be 61.91 kJ·mol−1 for the first dehydrogenation step. More importantly, the dehydrogenation temperature of as-prepared NaAlH4 nanocrystalline can be reduced to about 100 °C.
Highlights
Hydrogen is the most ideal fuel in comprehensive clean energy
NaAlH4 can be firstly synthesized by ballmilling the mixture of NaH/Al and Ni–B catalyst under Ar atmosphere for 15 h and in a low hydrogen pressure
Nanocrystalline NaAlH4 was successfully synthesized with Ni–B catalyst under a low hydrogen pressure by a facile two-step synthesis method
Summary
Hydrogen is the most ideal fuel in comprehensive clean energy. Ni–B, as an amorphous alloy catalyst, was used for the hydrogenation of benzene, cyclopentadiene, and acrylonitrile [17, 18]. We successfully prepared NaAlH4 by ball-milling NaH/Al mixtures with Co–B or TiB2 [21, 22] catalysts. Based on the above considerations, Ni–B amorphous alloy was synthesized by ball milling and used firstly as catalyst for the synthesis of NaAlH4. NaAlH4 can be firstly synthesized by ballmilling the mixture of NaH/Al and Ni–B catalyst under Ar atmosphere for 15 h and in a low hydrogen pressure. As-synthesized nanocrystalline NaAlH4 can release hydrogen even at 100 °C
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