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Supported ammonia borane decomposition through enhanced homopolar B-B coupling


The thermolytic decomposition of ammonia borane (AB) is known to proceed through the polymeric coupling reaction between -BH3 and -NH3 sites of multiple ammonia borane molecules, which results in the release of hydrogen and other by-products, e.g., ammonia, diborane and borazine. These by-products formation concomitantly pollutes the hydrogen stream, and therefore, it is necessary to remove these gases from the product stream. In the current work, a cost effective and easy to synthesize support material, aluminium phosphate (AP) is introduced in AB theromolytic decomposition. An in-situ MS study reveals that the AB and AP (w/w) loading ratio of (1×4) is the most promising as it is able minimise the dehydrogenation peak temperature by 18.89°C compared to that of pure AB. Additionally, in the presence of support material, the by-products formation of ammonia is reduced by 70.3%, with a complete suppression in borazine and diborane release. The mechanism behind by-product suppression of supported AB has been studied through 11B MAS NMR analysis which suggests, the release of hydrogen occurs through an intermolecular homopolar B-B bonding. The thermogravimetric and kinetic study also reveals that in the case of supported AB decomposition, hydrogen release through B-B interaction is much more efficient than a B-N interaction thus, limiting the possibility of autocatalysis during the supported decomposition reaction.

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Publication details

The article was received on 28 Feb 2018, accepted on 04 Apr 2018 and first published on 05 Apr 2018

Article type: Paper
DOI: 10.1039/C8DT00789F
Citation: Dalton Trans., 2018, Accepted Manuscript
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    Supported ammonia borane decomposition through enhanced homopolar B-B coupling

    B. Roy, A. Hajari, J. Manna and P. Sharma, Dalton Trans., 2018, Accepted Manuscript , DOI: 10.1039/C8DT00789F

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