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Old 05-07-2013, 08:03 PM   #1
Wynne-R
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Default Catalytic Carbon

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Activated carbon does not adsorb chloramines but rather removes them through its ability to act as a catalyst for the chemical breakdown of chloramines to innocuous chlorides in water. This catalytic reaction involves the formation of a carbon oxide intermediate (CO*). This reaction is as follows:

NH2Cl + H2O + C* = NH3 + Cl- + H+ + CO*

2NH2Cl + CO*= N2 + 2Cl- + 2H+ + H2O + C*
http://www.wqa.org/pdf/techbulletins/tb-chloramine.pdf

Did y’all know this? Really? Nobody told me.

I tripped over this trying to find out what ‘catalytic carbon’ is. It turns out they’re all catalytic it’s just that some are more catalytic than others with regard to chloramine.
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Old 05-07-2013, 08:27 PM   #2
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Yes, see http://wetnewf.org/pdfs/Brewing_arti...T_Chlorine.pdf pp 21-22.

I'm not sure I'd call it catalytic though as the carbon is actually oxidized by that first chloramine molecule and then subsequently reduced by the second 2. I guess you could call that catalysis.

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Old 05-07-2013, 09:34 PM   #3
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Yeah, I’ve read that one, several times. I have a copy on my files. Good stuff.

It seems that even that little Britta pitcher filter worked pretty well. I’m guessing a good carbon block would be better. How much chloramine is too much?

I have been using a tiny amount of Campden in my filtered water. A pinch would be enough, wouldn’t it? Something like 20 mg? I really can’t tell the difference.

I don’t know why carbon wouldn’t be a catalyst. It’s in the reaction, but not in the final product.

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