because the only way that could be practically done would take a LOTTTA tungsten and probably rhodium or something to not wear out and be extremely expensive to maintain

the reaction is going on in gas phase also, the advantage of the dissolved alumina is it is dispersed enough in the gas phase to actually catch those oxidising radicals

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That makes sense. Thanks for walking me through all this!

To tie this all back to the original topic would you say that alumina in jet fuel is a “necessary evil” to prevent corrosion?

IMO, it does seem to have a valid reason, but I’d have to then compare it against the climate and health impact. There’s incentive to hide or diminish that side of the argument.