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Title: Solvent- and catalyst-free mechanochemical synthesis of alkali metal monohydrides

Abstract

Alkali metal monohydrides, AH (A = Li–Cs) have been synthesized in quantitative yields at room temperature by reactive milling of alkali metals in the presence of hydrogen gas at 200 bar or less. The mechanochemical approach reported here eliminates problems associated with the malleability of alkali metals — especially Li, Na, and K — and promotes effective solid–gas reactions, ensuring their completion. This is achieved by incorporating a certain volume fraction of the corresponding hydride powder as a process control agent, which allows continuous and efficient milling primarily by coating the surface of metal particles, effectively blocking cold welding. Formation of high-purity crystalline monohydrides has been confirmed by powder X-ray diffraction, solid-state NMR spectroscopy, and volumetric analyses of reactively desorbed H2 from as-milled samples. The proposed synthesis method is scalable and particularly effective for extremely air-sensitive materials, such as alkali and alkaline earth metal hydrides. Furthermore, the technique may also be favorable for production in continuous reactors operating at room temperature, thereby reducing the total processing time, energy consumption and, hence, the cost of production of these hydrides or their derivatives and composites.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. Ames Lab. and Iowa State Univ., Ames, IA (United States)
Publication Date:
Research Org.:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1337688
Report Number(s):
IS-J-9092
Journal ID: ISSN 2050-7488; JMCAET
Grant/Contract Number:  
AC02-07CH11358
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Materials Chemistry. A
Additional Journal Information:
Journal Volume: 4; Journal Issue: 31; Journal ID: ISSN 2050-7488
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE

Citation Formats

Hlova, Ihor Z., Castle, Andra, Goldston, Jennifer F., Gupta, Shalabh, Prost, Timothy, Kobayashi, Takeshi, Scott Chumbley, L., Pruski, Marek, and Pecharsky, Vitalij K. Solvent- and catalyst-free mechanochemical synthesis of alkali metal monohydrides. United States: N. p., 2016. Web. doi:10.1039/c6ta04391g.
Hlova, Ihor Z., Castle, Andra, Goldston, Jennifer F., Gupta, Shalabh, Prost, Timothy, Kobayashi, Takeshi, Scott Chumbley, L., Pruski, Marek, & Pecharsky, Vitalij K. Solvent- and catalyst-free mechanochemical synthesis of alkali metal monohydrides. United States. doi:10.1039/c6ta04391g.
Hlova, Ihor Z., Castle, Andra, Goldston, Jennifer F., Gupta, Shalabh, Prost, Timothy, Kobayashi, Takeshi, Scott Chumbley, L., Pruski, Marek, and Pecharsky, Vitalij K. Wed . "Solvent- and catalyst-free mechanochemical synthesis of alkali metal monohydrides". United States. doi:10.1039/c6ta04391g. https://www.osti.gov/servlets/purl/1337688.
@article{osti_1337688,
title = {Solvent- and catalyst-free mechanochemical synthesis of alkali metal monohydrides},
author = {Hlova, Ihor Z. and Castle, Andra and Goldston, Jennifer F. and Gupta, Shalabh and Prost, Timothy and Kobayashi, Takeshi and Scott Chumbley, L. and Pruski, Marek and Pecharsky, Vitalij K.},
abstractNote = {Alkali metal monohydrides, AH (A = Li–Cs) have been synthesized in quantitative yields at room temperature by reactive milling of alkali metals in the presence of hydrogen gas at 200 bar or less. The mechanochemical approach reported here eliminates problems associated with the malleability of alkali metals — especially Li, Na, and K — and promotes effective solid–gas reactions, ensuring their completion. This is achieved by incorporating a certain volume fraction of the corresponding hydride powder as a process control agent, which allows continuous and efficient milling primarily by coating the surface of metal particles, effectively blocking cold welding. Formation of high-purity crystalline monohydrides has been confirmed by powder X-ray diffraction, solid-state NMR spectroscopy, and volumetric analyses of reactively desorbed H2 from as-milled samples. The proposed synthesis method is scalable and particularly effective for extremely air-sensitive materials, such as alkali and alkaline earth metal hydrides. Furthermore, the technique may also be favorable for production in continuous reactors operating at room temperature, thereby reducing the total processing time, energy consumption and, hence, the cost of production of these hydrides or their derivatives and composites.},
doi = {10.1039/c6ta04391g},
journal = {Journal of Materials Chemistry. A},
number = 31,
volume = 4,
place = {United States},
year = {2016},
month = {7}
}

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