"Lloyd E. Sponenburgh" lloydspinsidemindspring.com wrote in message
. 4.170...
Ignoramus3825 fired this volley
in
:

Yes, but they kept TiO2...

Again, Ig, you should call those "the catalyst pellets", and not
"TiO2".

They _may_ have a titanium dioxide SUBSTRATE (usually it's alumina
[Al2O3],
shrug), but that's not the catalyst.

As Bob correctly said, sintered oxide pellet is nothing but an INERT
solid
that can withstand high temperatures. Usually a rather thin layer
of a
catalytic metal is vapor-deposited on the outsides of the pellets.

Lloyd

TiO2 has some catalytic activity by itself:
http://www.energy.ca.gov/2007publica...0-2007-112.PDF
"The absorption of UV light produces electron-hole pairs in the
titanium dioxide particles."
"If instead of recombining with an electron, the hole reaches the
particle's surface, it can react with hydroxyl (OH-) ions from
adsorbed surface water and form highly reactive hydroxyl radicals."

I didn't see any mention of it for destroying toxic wastes that might
have contaminated the metal grating, but Google wouldn't reveal a
proprietary process.

--jsw