Quote:
Originally Posted by LostCause
I don't think standalone NOx reduction catalysts exist in the mainstream yet.
NOx adsorption catalysts have been around for awhile, but they operate on a different, less useful cycle. NOx adsorption catalysts accumulate NOx until the engine runs rich, where the three-way catalyst can operate normally.
- LostCause
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Hmmm.... I have from several sources that the TWC that GM uses is in fact a HC+CO catalyst as well as NOx reduction cat, hence the term three-way catalyst. They are very specific that the NOx portion is defined as a NOx reduction. I'll have to go back and look that up to refresh my memory. This TWC will only work efficiently for HC+CO and NOx when it operates around stoich.
At any rate, brown skies do need to go!!!
I may need to doublecheck my statement regarding the cat on the Duramax diesel though...