Preparation of Ternary Bimetal Amorphous Alloy Co-Ni-B and Its Catalytic Hydrolytic Dehydrogenation for Ammonia Borane
Journal Title: 河南科技大学学报（自然科学版） - Year 2019, Vol 40, Issue 4
Abstract
Via varying the molar ratio of raw materials and adding different surfactants, a series of ternary bimetal amorphous alloys ( Co-Ni-B) were prepared through a gentle liquid phase reduction route by using CoCl2, NiCl2 and NaBH4 as Co, Ni and B sources. The phase structure and microscopic characterestics were determined by X-ray diffraction ( XRD) and scanning electronic microscopy ( SEM) . The results show that asprepared products belong to typical amorphous alloy, which is micro globulay with the microspheric size ranging from 30 nm to 100 nm. Co-Ni-B microstruture by the surfactant assistance transforms to foam spongy three dimensional structure with silk-net like link, which has bigger porosity and specific area. The Co-Ni-B amorphous alloys exhibit considerably high catalytic activity for hydrolytic dehydrogenation of ammonium borane, which can fully release hydrogen within 10 min. The bigger the metals contain, the higher the catalytic activity is. Due to the bigger specific area, Co-Ni-B prepared with the help of surfactants has the stronger catalytic ability. The higher reaction temperature helps to increase the hydrogen release rate. The hydrolytic reaction conforms to the kinetic characteristics of zero order reaction, with apparent activation energy of 34. 16 kJ·mol-1.
Authors and Affiliations
Mingdi LIU, Quanxing LIU, Yana DONG, Gang MI, Jun ZHANG
Keywords
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- EP ID EP553938
- DOI 10.15926/j.cnki.issn1672-6871.2019.04.018
- Views 76
- Downloads 0
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