On Wed, 30 Oct 2002, Alex Fraser wrote: > In the light of the thread " more thoughts on catalysts" and on rereading > this post below it occurred to me that there are two iron oxides commonly called > red and black. The formation of steel from iron alloy seems to assure that it > produces red oxides which flake off easily and don't continue to protect the > metal, it rusts to ruin. Another formation of iron alloy called wrought iron > produces a black oxide which protects the metal, it don't flake off.
The black (hard) oxide is a lower oxidation state of Fe, and will turn into the red (soft, flaky) oxide in the presence of an oxidizer. The only way to do a good Iron oxide catalyst is likely to be mixing it with something that can be pressed into pellets and fired to produce a ceramic. Since ERPS already has a working cermet catalyst, it seems the only issue is whether or not to preheat the catalyst, and if so, how. My sense is that the best approach is to preheat the catalyst by firing on a warm day :-) Simple is good. ......Andrew -- Andrew Case | [EMAIL PROTECTED] | _______________________________________________ ERPS-list mailing list [EMAIL PROTECTED] http://lists.erps.org/mailman/listinfo/erps-list
