How is Hydrogen release from Aluminium

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Offline erickejah

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How is Hydrogen release from Aluminium
« on: 26/01/2009 19:28:57 »
How is Hydrogen release from Aluminium.  [?] [?]
Is it just temperature affecting its composition?
« Last Edit: 26/01/2009 19:46:01 by erickejah »

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Offline Make it Lady

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How is Hydrogen release from Aluminium
« Reply #1 on: 26/01/2009 20:02:21 »
I'm not sure what you mean here. Aluminium clusters and Aluminium alloys can release hydrogen from water but I have never heard of pure Aluminium suddenly releasing hydrogen!!!
Can you clarify your question?
Give a man a fire and he is warm for a day, set a man on fire and he is warm for the rest of his life.

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Offline erickejah

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How is Hydrogen release from Aluminium
« Reply #2 on: 26/01/2009 20:17:37 »
yes, it would be aluminium in close contact with water. ie: a steam generator.

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Offline Chemistry4me

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How is Hydrogen release from Aluminium
« Reply #3 on: 26/01/2009 21:40:35 »
You talking about this?

Quote
By using sodium hydroxide as a catalyst, aluminum and its alloys can react with water to generate hydrogen gas.
http://en.wikipedia.org/wiki/Hydrogen_production

Al + 3H2O → Al(OH)3 + 1.5 H2

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Offline erickejah

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How is Hydrogen release from Aluminium
« Reply #4 on: 26/01/2009 22:59:22 »
Tx,, it is HTE(High-temperature electrolysis) http://en.wikipedia.org/wiki/High-temperature_electrolysis

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Offline Chemistry4me

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How is Hydrogen release from Aluminium
« Reply #5 on: 26/01/2009 23:02:28 »
So you found it yourself?

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Offline erickejah

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How is Hydrogen release from Aluminium
« Reply #6 on: 26/01/2009 23:11:03 »
nope, it was through out the links that you posted here, [:o].
I do not always trust in sources like Wikipedia, since anybody can edit it. [:P]

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Offline erickejah

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How is Hydrogen release from Aluminium
« Reply #7 on: 26/01/2009 23:12:17 »
That is way I found myself asking subject matter experts like you. [:)] [:D]

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Offline Chemistry4me

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How is Hydrogen release from Aluminium
« Reply #8 on: 26/01/2009 23:14:31 »
That is way I found myself asking subject matter experts like you. [:)] [:D]
I am humbled by your comment [:I][:I][:I]

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Offline Chemistry4me

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How is Hydrogen release from Aluminium
« Reply #9 on: 26/01/2009 23:16:34 »
Aluminium always has a layer of aluminium oxide on the surface, without this coating it would actually be quite reactive.

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Offline erickejah

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How is Hydrogen release from Aluminium
« Reply #10 on: 27/01/2009 03:44:53 »
cool, does the aluminium oxide works like boron?

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Offline Chemistry4me

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How is Hydrogen release from Aluminium
« Reply #11 on: 27/01/2009 04:37:10 »
Don't know what you mean [???][???][???]

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Offline Chemistry4me

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How is Hydrogen release from Aluminium
« Reply #12 on: 27/01/2009 04:42:17 »
Oh, do you mean like: boron does not react with water and is unaffected by air at ordinary temperatures?

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Offline lightarrow

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How is Hydrogen release from Aluminium
« Reply #13 on: 27/01/2009 15:36:32 »
How is Hydrogen release from Aluminium.  [?] [?]
Is it just temperature affecting its composition?
You mean that a ship made of aluminum should dissolve in the water releasing hydrogen? Those stupid people who made them... [;D]
Aluminum reacts with water only in particular cases:
1. with the action of a non-oxidant acid (HCl ecc.)
2. with the action of a base (even soda or, heating, even baking soda)
3. with the action of a catalyzer as Hg or Ga or Hg salts
4. at melting point
5. continously removing mechanically the Al2O3 layer
... probably other ways I don't know.
« Last Edit: 27/01/2009 15:41:32 by lightarrow »

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Offline erickejah

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How is Hydrogen release from Aluminium
« Reply #14 on: 28/01/2009 01:57:48 »
 [:)]

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Offline Chemistry4me

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How is Hydrogen release from Aluminium
« Reply #15 on: 29/01/2009 03:06:02 »
Do you pronounce Aluminium: A-lum-in-num or Alu-min-i-um?

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Offline Bored chemist

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How is Hydrogen release from Aluminium
« Reply #16 on: 29/01/2009 20:47:48 »
Do you pronounce Aluminium: A-lum-in-num or Alu-min-i-um?
Correctly.
Please disregard all previous signatures.

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Offline Chemistry4me

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How is Hydrogen release from Aluminium
« Reply #17 on: 29/01/2009 22:12:06 »
Yeah? And what might that be?

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Offline Chemistry4me

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How is Hydrogen release from Aluminium
« Reply #18 on: 30/01/2009 02:21:49 »

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Offline erickejah

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How is Hydrogen release from Aluminium
« Reply #19 on: 02/02/2009 01:07:49 »

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Offline Chemistry4me

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How is Hydrogen release from Aluminium
« Reply #20 on: 02/02/2009 01:14:03 »
What is the diagram for?

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Offline lancenti

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How is Hydrogen release from Aluminium
« Reply #21 on: 02/02/2009 06:52:12 »
It's an Electrolysis Cell, and it's probably there just because it's pretty.


For the purposes of completeness,

Al2O3 with Acid:

Al2O3 + 6 HCl → 2 Al3+ + 6 Cl- + 3 H2O

Al2O3 with Base:

Al2O3 + 2 NaOH → 2 Na2Al(OH)4

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Offline ...lets split up...

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How is Hydrogen release from Aluminium
« Reply #22 on: 02/02/2009 07:08:41 »
Do you pronounce Aluminium: A-lum-in-num or Alu-min-i-um?
You pronounce it Alu-min-i-um, pay no attention to the American's when it comes to pronouncing english words. Under no circumstances would a "nium" sound like a "num". Also, they tend to put emphasis on the wrong vowels.
I love lamp

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Offline Chemistry4me

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How is Hydrogen release from Aluminium
« Reply #23 on: 02/02/2009 07:20:19 »
Okay ...lets split up... you said it! Now prepared to be ripped apart!!!!!!! [:D][:D][:D]

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Offline lightarrow

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How is Hydrogen release from Aluminium
« Reply #24 on: 02/02/2009 12:13:25 »
It's an Electrolysis Cell, and it's probably there just because it's pretty.


For the purposes of completeness,

Al2O3 with Acid:

Al2O3 + 6 HCl → 2 Al3+ + 6 Cl- + 3 H2O
Are you sure of this? I don't think HCl is able to dissolve Al2O3

Quote
Al2O3 with Base:

Al2O3 + 2 NaOH → 2 Na2Al(OH)4
Actually is NaAl(OH)4

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Offline erickejah

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How is Hydrogen release from Aluminium
« Reply #25 on: 03/02/2009 04:22:13 »
Okay ...lets split up... you said it! Now prepared to be ripped apart!!!!!!! [:D][:D][:D]
that is way i prefer to say it in spanish: "aluminio"

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Offline lancenti

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How is Hydrogen release from Aluminium
« Reply #26 on: 03/02/2009 12:36:44 »
Hot dilute HCl should be enough to react with aluminium oxide.

... and oops, yes it should be only one Na in NaAl(OH)4

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Offline lightarrow

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How is Hydrogen release from Aluminium
« Reply #27 on: 03/02/2009 13:02:22 »
Hot dilute HCl should be enough to react with aluminium oxide.
Ok, but it depends on the form in which the oxide is present; with corundum crystals you can wait centuries before dissolving it with HCl  [:)]
It have to be in a very non-compact form (tiny particles, or oxide-idroxide, ecc.)
« Last Edit: 03/02/2009 13:04:52 by lightarrow »