Join Date: Jan 2003
Location: Boolarra, doh! :-/
Re: True or False re: LPG 'Zorsts
I did a class on this today :)
Cat converters: (have two parts)
OXIDATION CATALYST 2NO => N2+O2 or 2NO => N[size=1]2 + 2O2
REDUCTION CATALYST 2CO + O2 => 2CO2
I'm assuming a cat converter would be needed for LPG (rich) due to high CO emissions. (Rich LPG however has low NOx, and high hydrocarbons emissions). LPG (lean) could be a different matter, as it has low CO, low NOx, low hydrocarbons.
CO as we know is a no-no for us peoples to inhale. NO however (yes, don't we wish that was N2O) is very reactive with other atmospheric molecules. In a perfect environment with no pollutants -- freeradical organic molecules and hydrocarbons in particular -- NO reacts with ozone to make N2 and O2. This is a good process however, because it is ozone that is close to the earth's surface which it reacts with. This ozone is actually bad for us due to the fact that we can breathe this stuff in (it's toxic, + an irritant). NO doesn't have time to react with ozone up in the stratosphere, which is the stuff that blocks out UV rays.
EDIT (forgot to add): Because we don't live in a perfect world, there are hydrocarbons & freeradicals floating around. NO "traditionally" reacts with low-altitude O3, but when these pollutants are around, the NO has a choice of what to react with, and it happens to react with these pollutants much more quickly, meaning that O3 levels start to rise rather than remain in equlibrium.
Hope that wasn't too off-topic, I just thought it was good timing for me to reply with this since I learnt this about an hour ago :)
'91 EB Fairmont Ghia V8.
Pacemaker PH4000 extractors
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AUII XR8 t/b & maf, ELGT snorkel
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