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That paper has been reviewed, then published, looks like a decently thorough investigation of one failure mode of one Mazda catalytic converter.
Do you have any idea why the researchers never did anything with the idea?
I would interview a couple of muffler shop installers to see how many cats they've remove that are candidates for cleaning/rejuvenation treatment. You know, look physically good (the ceramic isn't broken, case not rusted through) but aren't working as advertised.
Another thing to consider with such a cleaning system in a commercial application is the waste stream... concentrated heavy metals, oil, etc in high Ph water solution might be difficult/expensive to dispose of in California. There has to be a way to post-treat on site, but it might be expensive.
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