--- Robert Del Bueno <[EMAIL PROTECTED]> wrote:
> Can NOX emission increases from the use of biodiesel be successfully
> dealt
> with (at least brought back down to baseline) using a catalytic
> converter
> (in the event a vehicle uses sulfur free b100 only) ?
The short answer - no. Petrol (gasoline) engines have a 3 way catalytic
converter which can get rid of NOx, but this only works if there is no
oxygen left in the exhaust. For this reason a stoichiometric mixture of
fuel and oxygen is required. Diesel engines are lean-burn engines,
which means that they have far more air present than a stoichiometric
mix, and hence there is oxygen left in the exhaust. If a 3-way
catalytic converter were fitted, it would actually combine the oxygen
left with nitrogen and produce _more_ NOx emissions. For this reason,
Diesel engines are fitted with 2-way catalytic converters, which are
able to break down unburnt hydrocarbons very effectively. This is
therefore unaffected by whether you are using petrodiesel or biodiesel.
I'm not sure what the third catalyst in a 3-way CC does - it's been a
few years since I studied engine operation!
Hope that helps,
Donald
=====
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