The Naked Scientists

The Naked Scientists Forum

Author Topic: Other catalysts for H2O2?  (Read 6734 times)

Offline Bill.D.Katt.

  • Sr. Member
  • ****
  • Posts: 179
    • View Profile
Other catalysts for H2O2?
« on: 30/10/2010 21:15:19 »
I have seen videos of KI and NaClO acting as a catalyst for 2H2O2=O2+2H20. What other common household items could act as such a catalyst?


 

Offline maffsolo

  • Sr. Member
  • ****
  • Posts: 280
    • View Profile
Other catalysts for H2O2?
« Reply #1 on: 31/10/2010 00:54:57 »
I have seen videos of KI and NaClO acting as a catalyst for 2H2O2=O2+2H20. What other common household items could act as such a catalyst?
Cobalt Cloride + Hydrogen Peroxide --->

I could not find any common household Potassium Iodine nor any Sodium Clorate any where in the house so I settled for a hand full of CoCl2·6H2O from an old chemistry Set.
« Last Edit: 31/10/2010 01:01:04 by maffsolo »
 

Offline Bill.D.Katt.

  • Sr. Member
  • ****
  • Posts: 179
    • View Profile
Other catalysts for H2O2?
« Reply #2 on: 31/10/2010 04:54:00 »
Thanks! I mentioned KI and NaClO as common household chemicals because one is considered a salt substitute, and the other is bleach. Would this work with with other chlorides like CuCl2 or FeCl2?
 

Offline Bored chemist

  • Neilep Level Member
  • ******
  • Posts: 8667
  • Thanked: 42 times
    • View Profile
Other catalysts for H2O2?
« Reply #3 on: 31/10/2010 09:38:33 »
It might work a bit, but the reaction with Co++ is fairly specific.
Baking yeast or blood work too.
 

Offline Bill.D.Katt.

  • Sr. Member
  • ****
  • Posts: 179
    • View Profile
Other catalysts for H2O2?
« Reply #4 on: 31/10/2010 16:55:18 »
What properties are we looking for in this catalyst? Is it extremely high electronegativity for the anion and low electronegativity for the cation? If so it would seem that NaCl would do a great job. Why doesn't it?
 

Offline rosy

  • Neilep Level Member
  • ******
  • Posts: 1018
  • Chemistry
    • View Profile
Other catalysts for H2O2?
« Reply #5 on: 31/10/2010 22:22:13 »
Liver is very effective. Also potatoes.
Those use the enzyme catalase.
I imagine yeast and blood also use catalase.
 

Offline Bored chemist

  • Neilep Level Member
  • ******
  • Posts: 8667
  • Thanked: 42 times
    • View Profile
Other catalysts for H2O2?
« Reply #6 on: 01/11/2010 06:56:21 »
I don't think the chloride had much to do with the decomposition. The fact that cobalt has two oxidation states is more likely to make a difference than the electronegativity.
 

Offline Bill.D.Katt.

  • Sr. Member
  • ****
  • Posts: 179
    • View Profile
Other catalysts for H2O2?
« Reply #7 on: 01/11/2010 15:39:50 »
Bored Chemist, so a Manganese ion or iron ion would be great for this? (I was just considering the many oxidation states)
 

Offline Bored chemist

  • Neilep Level Member
  • ******
  • Posts: 8667
  • Thanked: 42 times
    • View Profile
Other catalysts for H2O2?
« Reply #8 on: 01/11/2010 19:34:46 »
Manganese dioxide is the "classic" catalyst for decomposing H2O2 in the lab.
Catalase is a (very complicated) iron compound.
Incidentally, hypochlorite doesn't catalyse the decomposition- it oxidises the peroxide to oxygen and is reduced to sodium chloride.
 

The Naked Scientists Forum

Other catalysts for H2O2?
« Reply #8 on: 01/11/2010 19:34:46 »

 

SMF 2.0.10 | SMF © 2015, Simple Machines
SMFAds for Free Forums