能源化学(英文)
ISSN 1003-9953
     
能源化学(英文) 2017, Vol. 26 Issue (1) :24-34    DOI: 10.1016/j.jechem.2016.08.011
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Synthesis of amorphous manganese borohydride in the (NaBH4-MnCl2) system, its hydrogen generation properties and crystalline transformation during solvent extraction
Robert A. Varina, Deepak K. Mattara, Amirreza Shirani Bidabadia, Marek Polanskib
a Department of Mechanical and Mechatronics Engineering and Waterloo Institute for Nanotechnology, University of Waterloo, 200 University Ave. W., Waterloo, Ontario N2L 3G1, Canada;
b Faculty of New Technologies and Chemistry, Military University of Technology, 2 Kaliskiego Str., 00-908 Warsaw, Poland
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摘要 The mixture of (2NaBH4+MnCl2) was ball milled in a magneto-mill. No gas release was detected. The XRD patterns of the ball milled mixture exhibit only the Bragg diffraction peaks of the NaCl-type salt which on the basis of the present X-ray diffraction results and the literature is likely to be a solid solution Na(Cl)x(BH4)(1-x), possessing a cubic NaCl-type crystalline structure. No presence of any crystalline hydride was detected by powder X-ray diffraction which clearly shows that NaBH4 in the initial mixture must have reacted with MnCl2 forming a NaCl-type by-product and another hydride that does not exhibit X-ray Bragg diffraction peaks. Mass spectrometry (MS) of gas released from the ball milled mixture during combined MS/thermogravimetric analysis (TGA)/differential scanning calorimetry (DSC) experiments, confirms mainly hydrogen (H2) with a small quantity of diborane gas, B2H6. The Fourier transform infra-red (FT-IR) spectrum of the ball milled (2NaBH4+MnCl2) is quite similar to the FT-IR spectrum of crystalline manganese borohydride, c-Mn(BH4)2, synthesized by ball milling, which strongly suggests that the amorphous hydride mechano-chemically synthesized during ball milling could be an amorphous manganese borohydride. Remarkably, the process of solvent filtration and extraction at 42℃, resulted in the transformation of mechano-chemically synthesized amorphous manganese borohydride to a nanostructured, crystalline, c-Mn(BH4)2 hydride.
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关键词Ball milling   Mechano-chemical activation synthesis   Amorphous manganese borohydride   Mn(BH4)2   Dehydrogenation behavior   Solvent extraction   Crystallization of manganese borohydride   Mn(BH4)2     
收稿日期: 2016-06-22; 发布日期: 2016-10-19
通讯作者 Robert A. Varin     Email: robert.varin@uwaterloo.ca
引用本文:   
.Synthesis of amorphous manganese borohydride in the (NaBH4-MnCl2) system, its hydrogen generation properties and crystalline transformation during solvent extraction[J]  能源化学(英文) , 2017,V26(1): 24-34
.Synthesis of amorphous manganese borohydride in the (NaBH4-MnCl2) system, its hydrogen generation properties and crystalline transformation during solvent extraction[J]  Journal of Energy Chemistry, 2017,V26(1): 24-34
链接本文:  
http://www.jenergchem.org/CN/10.1016/j.jechem.2016.08.011     或     http://www.jenergchem.org/CN/Y2017/V26/I1/24
 
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