Instructables

How would i compress hydrogen gas into a propane-type bottle?

im trying to store hydrogen into these propane bottles so i can use that instead of propane to fuel my foundry furnace.

 You can't store hydrogen in propane bottles. Hydrogen is extremely dangerous. However, there is a lot of interest in hydrogen in powering automobiles, so storing hydrogen has been studied. Read the "Storage" section of http://en.wikipedia.org/wiki/Hydrogen_economy#Production.2C_storage.2C_infrastructure for ideas.

This is what the article has to say about safety: "Hydrogen has the widest explosive/ignition mix range with air of all the gases except acetylene. That means that whatever the mix proportion between air and hydrogen, a hydrogen leak will lead to an explosion, not a mere flame. This makes the use of hydrogen particularly dangerous in closed areas (tunnels, parkings)..[47] Some differences with common fuels include the fact that pure hydrogen-oxygen flames burn in the ultraviolet color range and are nearly invisible to the naked eye, thus it requires a flame detector to detect if a hydrogen leak is burning. Hydrogen is odorless and leaks cannot be detected by smell."
lane56252 years ago
You cannot, I repeat cannot compress hydrogen into a propane tank, period, end of story. 1) hydrogen and oxygen explode so you would need to evacuate ALL oxygen from the cylinder. If you're using HHO forget that, it has it's own oxygen in the mixture. 2) The amount of space necessary to compress hydrogen far exceeds the capacity of a propane cylinder. One gram of hydrogen takes up as much physical space as 11 liters of oxygen. 3) Did I mention it will explode?

Now, do some research into storing your hydrogen in a metal hydride state. There are three ways to store hydrogen, 1) freeze it at -238 degrees Celsius, 2) compress it at 20,000 PSI and lastly 3) absorb the hydrogen into a metal hydride.

You can take a cylinder the size of a 12 gram co2 cartridge, fill it 80% of the way with a metal hydride and it will hold 12 liters of hydrogen. It still needs to be compressed, but at 112 psi, not 20,000

Now you're asking yourself, where do I find metal hydride. Well the easiest place is inside NIMH rechargeable batteries. The negative terminal of a NIMH battery in most cases contains LaNi5 which is a good metal hydride for storing hydrogen.

The outside case of a NIMH battery (in all cases is the size of a AA battery) and made of stainless steel. It can be cut open using a good pair of wire snips. Make a small snip in the metal and peal it like an apple in a circular fashion. This will remove the outside casing. Unroll the two metal plates. The inside plate is the positive side (contains NOOHI and not very good for hydrogen storage) and the outside plate is the negative side, that's the one you want. Scrape the metal hydride from the nickle plate and you have LaNi5. Collect enough of it and you can fill a small cylinder.

Be careful of the white film that separates the two plates, this is potassium hydroxide and works like an acid. Use gloves and wash your hands with water when you're done.
seandogue4 years ago
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GalaxyX (author)  seandogue4 years ago
yes but buying oxenated air would be much more expensive sinse all i haveto do for hydrogen in put in some water and plug it in.
lemonie4 years ago
Propane is probably cheaper, definitely safer, and you'd get more of it in a bottle. Don't try it.

L