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Title :Surface-Controlled Conversion of Ammonia Borane from Boron Nitride
Authors :Nakagawa, Tessui
Uesato, Hiroki
Burrell, Anthony K.
Ichikawa, Takayuki
Miyaoka, Hiroki
Davis, Benjamin L.
Kojima, Yoshitsugu
Issue Date :23-Oct-2020
Abstract :“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 ^<11>B-NMR revealed the presence of AB after NH_3/N_2H_4 treatment of milled h-BN (BNH_x) 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(NH_2)_3 and hydrazine borane were found by solution ^<11>B-NMR after soaking BNH_x in liquid NH_3 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 B_3N_3 ring structure and then creation of B-H bond is the key issue to increase conversion yield of AB.
URL :https://doi.org/10.3390/en13215569
Type Local :雑誌掲載論文
ISSN :1996-1073
Publisher :MDPI
URI :http://hdl.handle.net/20.500.12000/47495
Citation :Energies Vol.13 no.21
Appears in Collections:Peer-reviewed Journal Articles (Faculty of Science)

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