Options
Towards an understanding of the beneficial effect of mesoporous materials on dehydrogenation characteristics of NH3BH3
Date Issued
2016
Abstract
Ammonia borane (AB) was loaded onto a range of mesoporous materials (MCM-41, SBA-15 and MCF) by wet impregnation from THF solutions and its thermal dehydrogenation studied using TGA/MS. The interactions between the AB and the surfaces were characterised using difference FTIR spectroscopy. The presence of mesoporous materials promotes lower temperature H2 release, and greater selectivity towards the formation of H2, i.e. decreased formation of gaseous boroncontaining side products. D-FTIR results confirm interactions between isolated silanol groups or surface Si-O-Si species and AB and this supports the proposal that a H-bonding interaction between the surface and deposited AB is important in promoting decomposition at lower temperature. AB interacting with silanol groups decomposes more readily than that coordinated to Si-O-Si. The effect on the temperature of H2 release is greater for materials of larger pore size (rather than materials of larger surface area), i.e. MCF>SBA-15>MCM-41. This suggests that access to the internal surface of the mesoporous material (where the majority of surface silanols are located) is important, and this in turn suggests that polymeric species, which may have restricted access to the internal surface of the different materials, form when AB is dissolved in THF. Decomposition of B-N-containing gaseous materials (to AB(g)) following their formation, on the silanol groups of the SiO2, is suggested as the reason for the increased selectivity of the reaction to H2 (and decreased release of unwanted side products) in the presence of mesoporous material.
Sponsorship
Science Foundation Ireland
Type of Material
Journal Article
Publisher
Elsevier
Journal
Applied Catalysis B: Environmental
Copyright (Published Version)
2016 Elsevier
Language
English
Status of Item
Peer reviewed
This item is made available under a Creative Commons License
Owning collection
Scopus© citations
18
Acquisition Date
Apr 17, 2024
Apr 17, 2024
Views
1747
Last Week
2
2
Last Month
7
7
Acquisition Date
Apr 17, 2024
Apr 17, 2024
Downloads
499
Last Week
1
1
Last Month
7
7
Acquisition Date
Apr 17, 2024
Apr 17, 2024