Hello!
I was trying to make hydrogen react with the metal hydride to form hydrogen storage technology, I have verified the connections o ensure no leakage and when supplied , I am not observing any characteristics difference in hydride to predict whether hydrogen has being absorbed or not. I believe the issue could be the activation of the hydride as the hydride used was directly from the argon packed metal hydride glass bottle. Also, no pressure increase on the other end was observed to conclude any hydrogen compression.
Can anyone provide any recommendations????
Are you trying the chemical reaction between metal and hydrogen, or metal hydride and hydrogen? Metal hydride is itself a solid-type storage for hydrogen, as it forms when metal reacts with hydrogen at specific temperature and pressure.
Isha Arora Hello Isha! Hope you are doing well!
Thank you for your reply
Yes I have a metal basically an intermetallic compound(LaNi5), and I am trying to get a reaction of it with hydrogen, but I am not observing any absorption and desorption and I was wondering if activation might be required. if you have any suggestions let me know !
regards
Ketan
You can try to activate the LaNi5 by applying heat and vacuum (this can create micro-cracks that help H2 enter the lattice). Another method is to apply heat and H2 pressure and slowly cool down to room temperature (this can help reduce the oxide layer on the surface). You should see a pressure drop if the H2 is absorbed.
@Loris Lombardo Hello Loris! Thanks for your reply
Will (TGA) Thermograbimetric analyzer activate hydride?
Regards
Ketan
The best would be to activate the material under vacuum or H2 pressure so a pressure autoclave is recommended. The risk with TGA activation under H2 flow is the exposure to air after activation (fire hazard).
Hello,
The protocol that we follow to activate the LaNi alloy is as follows:
-introduce 40 bar H2 to the reactor and heat it at 80°C (for 3 h)
-depressurize the reactor and put it under a dynamic vacuum (for 3 h)
And we do 5 cycles. Once you have done this, the alloy should start to form the hydride
Carlos Castilla Martinez Hi carlos! ,thanks for your message, the highest pressure we could go would be 100 psia based on the hydrogen cylinder we have , any recommendations ??
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