NaAlH4 production from waste aluminum by reactive ball milling

Sustainable NaAlH4 production from recycled automotive Al alloy

“…The formation of Na 3 AlH 6 as an intermediate phase in the formation of NaAlH 4 was also previously mentioned in the literature. 24,47,54,55 Besides the previously mentioned phases, in the diffraction pattern of less pure NaAlH 4 , reflections of Si are also visible. of released hydrogen equal to 3.6 wt% is achieved.…”

“…Therefore, to increase the yield of conversion, the material was milled for a further 25 h. The observed changes in pressure and temperature during the milling are in agreement with the multi-step reaction mechanism proposed in ref. 47.…”

“…Taking the current situation of Al production into consideration, when pursuing large-scale production of NaAlH 4 from pure Al, the economical and environmental consequences that such process will entail should be taken into account. 4,46,47 On the one side, reducing the cost of synthesizing NaAlH 4 is of great importance. London Metal Exchange (LME) shows that Al has a price of around 2700 US$ per ton, while the price for Al scraps is about 1980 US$ per ton (∼27% cost saving).…”

Solid-State Hydrogen Storage for a Decarbonized Society

“…This lack of publications can be traced to the interest of the scientific community in deeply understanding material physicochemical properties and correlating them to specific material compositions, whereas the utilization of recycled material will inevitably introduce into the system several different contaminants. A pioneering work on the use of metal scraps for the production of hydrogen storage materials has been the one from Bergemann et al [81]. In this work, based on the ball milling technique [82], NaAlH 4 was synthesized using aluminum obtained from a waste incineration plant and commercial NaH.…”

Alanates, a Comprehensive Review

“…Other factors to be careful with are the thermodynamics (related to the dehydrogenation temperature, but also to the quantity of heat added/removed to/from the system), the onboard efficiency (90%), etc. Moreover, in the future, factors such as recyclability, sustainability, or alanate production from recycled materials [16,17] must also be included as critical factors. However, niche applications for different applications [18] could be developed while using different hydrogen storage materials, including the alanates.…”