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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.
Urea & Adblue injection have been around awhile, but I didn't think they made it over to the United States yet. Is this the technology GM's using? In any case, it's kind of a bittersweet solution as Urea is derived from ammonia, which is manufactured from the heavily energy-intensive Haber process.
Standalone NOx catalysts are in the works, though, and I think it will be a huge deal when they are available commercially. Brown skies, (mostly) good bye.
- LostCause
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