Sciencemadness Discussion Board - can hydrogen be stored under low pressure for hydrogenation reactions?

can hydrogen be stored under low pressure for hydrogenation reactions?

bluamine - 1-12-2022 at 09:08

Hi everyone!!
I have no access for hydrogen tanks but I have an oxygen tank with a maximum pressure of 2000 psi, can I use it for hydrogenation reactions?

[Edited on 1-12-2022 by bluamine]

Texium - 1-12-2022 at 09:14

Refilling gas canisters, especially with gases that they were not intended to store, is ill-advised and potentially dangerous.

blogfast25 - 1-12-2022 at 09:35

Quote: Originally posted by bluamine

can I use it for hydrogenation reactions?

Which reactions specifically?

Ans what @Texium said.

bluamine - 1-12-2022 at 11:07

Quote: Originally posted by Texium

Refilling gas canisters, especially with gases that they were not intended to store, is ill-advised and potentially dangerous.

Well TBH I was wondering if I can use a relatively small amount of hydrogen

Quote: Originally posted by blogfast25

Which reactions specifically?

Ans what @Texium said.

I'm interested in several reactions actually, but at the moment I'm specifically interested in hydrogenation of Cyclohexene to convert it to Cyclohexane

[Edited on 1-12-2022 by bluamine]

blogfast25 - 1-12-2022 at 12:04

Quote: Originally posted by blogfast25

Which reactions specifically?

.[/rquote]
I'm interested in several reactions actually, but at the moment I'm specifically interested in hydrogenation of Cyclohexene to convert it to Cyclohexane

Quite a few hydrogenations can now be carried out wirh ammonium formate and Pd-C as catalyst. No gaseous H₂ needed.

[Edited on 1-12-2022 by blogfast25]

Fery - 1-12-2022 at 12:16

Today I did hydrogenation reaction with Pd/C catalyst and I used 1 L plastic bottle submersed in water bath. The bottle was initially filled with water, then filled with H2 produced by electrolysis and at the end the H2 was consumed in the reaction by a connection with a hose leading through the water bath.

BromicAcid - 1-12-2022 at 14:13

Yeah, be very careful putting hydrogen into units not intended for it, hydrogen embrittlement is a real threat.

bluamine - 1-12-2022 at 15:23

Quote: Originally posted by blogfast25

Quite a few hydrogenations can now be carried out wirh ammonium formate and Pd-C as catalyst. No gaseous H₂ needed.

[Edited on 1-12-2022 by blogfast25]

Well some reactions must be done under pressure so it's impossible to do them without pressured hydrogen

Fery - 1-12-2022 at 22:32

bluamine you wanted hydrogenate Cyclohexene to convert it to Cyclohexane which runs fine at atmospheric pressure... slowly (few hours) but runs... at least you can do this one reaction without need of compressed H2

bluamine - 1-12-2022 at 23:54

Quote: Originally posted by Fery

bluamine you wanted hydrogenate Cyclohexene to convert it to Cyclohexane which runs fine at atmospheric pressure... slowly (few hours) but runs... at least you can do this one reaction without need of compressed H2

Ferrry I'm not sure but I read somewhere that I need 4 ATM or a little bit more for some reactions I'm interested in.. I know I may need a pressure cooker to do but I remember some reactions may need up to 10 ATM
So I think i really need to buy a hydrogen tank but is it legal to buy in Europe? If so, I can bring one from there!

[Edited on 2-12-2022 by bluamine]

Fery - 2-12-2022 at 02:54

bluamine I did this with different substrate of C=C bond hydrogenation at atmospheric pressure, there is also time of the reaction (few hours)
https://www.sciencemadness.org/whisper/viewthread.php?tid=15...

blogfast25 - 2-12-2022 at 05:35

Quote: Originally posted by Fery

A typical pressure cooker will only deliver about 30 psi (2 atm) and obviously isn't designed for H₂. Careful!

[Edited on 2-12-2022 by blogfast25]

clearly_not_atara - 2-12-2022 at 08:18

Nickel-catalysed isopropanol-donor CTH can reduce alkenes with the assistance of ultrasound:

https://www.sciencedirect.com/science/article/pii/S138589472...