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Surface-Controlled Conversion of Ammonia Borane from Boron Nitride

Journal Article · · Energies (Basel)
DOI:https://doi.org/10.3390/en13215569· OSTI ID:1787286
 [1];  [1];  [2];  [3];  [3];  [2];  [3]
  1. Univ. of the Ryukyus, Okinawa (Japan)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Hiroshima Univ. (Japan)
“One-pot regeneration”, which is simple regneneration method of ammonia borane (AB) using hydrazine and liquid ammonia, enables conversion of AB from hexagonal boron nitride (h-BN) after milling hydrogenation. Solution 11B-NMR revealed the presence of AB after NH3/N2H4 treatment of milled h-BN (BNHx) although the yield of AB was less than 5%. The conversion mechanism was clarified as B-H bonds on the h-BN surface created by ball-milling under hydrogen pressure have an ability to form AB, which was confirmed by Thermogravimetry-Residual Gas Analysis (TG-RGA) and Infrared (IR) analysis. The reaction routes are also the same as regeneration route of polyborazylene because intermediates of AB such as (B(NH2)3 and hydrazine borane were found by solution 11B-NMR after soaking BNHx in liquid NH3 and hydrazine, respectively. Because of the fact that all reactions proceed on the h-BN surface and no reaction proceeds when neat h-BN is treated, breaking of B3N3 ring structure and then creation of B-H bond is the key issue to increase conversion yield of AB.
Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
89233218CNA000001
OSTI ID:
1787286
Report Number(s):
LA-UR--12-22584
Journal Information:
Energies (Basel), Journal Name: Energies (Basel) Journal Issue: 21 Vol. 13; ISSN 1996-1073
Publisher:
MDPI AGCopyright Statement
Country of Publication:
United States
Language:
English

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