Quasi in situ Mössbauer and XAS studies on FeB nanoalloy for heterogeneous catalytic dehydrogenation of ammonia borane

In our previous report, about 1 equiv. H 2 can be evolved from a Fe-modified ammonia borane (AB) sample at a temperature as low as 60 °C with significant depression of induction period, sample foaming and toxic byproducts [1]. In this study, the effects of catalyst precursors and catalyst loading we...

Full description

Saved in:
Bibliographic Details
Published in:Catalysis today 2011-07, Vol.170 (1), p.69-75
Main Authors: He, Teng, Wang, Junhu, Liu, Tao, Wu, Guotao, Xiong, Zhitao, Yin, Jie, Chu, Hailiang, Zhang, Tao, Chen, Ping
Format: Article
Language:English
Subjects:
absorption
ammonia
Ammonia borane
byproducts
catalytic activity
desorption
Fe–B nanoalloy
foaming
Heterogeneous catalysis
hydrogen
hydrogen production
Hydrogen storage
mixing
Mössbauer
spectroscopy
temperature
toxicity
X-radiation
XAS
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:In our previous report, about 1 equiv. H 2 can be evolved from a Fe-modified ammonia borane (AB) sample at a temperature as low as 60 °C with significant depression of induction period, sample foaming and toxic byproducts [1]. In this study, the effects of catalyst precursors and catalyst loading were investigated on the hydrogen desorption profile and the formation of crystalline polyaminoborane (PAB). The experimental results show that loading 2.0 mol.% FeCl 3 to solid-state AB gives the best performance of formation of crystalline PAB. The rate of hydrogen evolution from the Fe-modified AB is 5.8 times as that of neat AB at 60 °C. X-ray absorption spectroscopy (XAS) and quasi in situ 57Fe Mössbauer characterizations show that Fe–B nanoalloy, which functions as catalytic species in the dehydrogenation, is formed upon mixing AB with FeCl 3.
ISSN:0920-5861
1873-4308
DOI:10.1016/j.cattod.2011.02.041