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I'm wondering if anyone knows by what mechanism is platinum (or other noble metals) catalyst on alumina substrate poisoned?

Presently, I'm using platinum on alumina to decompose a hydrogen peroxide / $ \ce{KNO3}$ solution and have found the catalyst material poisoned. I'm wondering if the poisoning is due to the $\ce{KNO3}$ or if my peroxide is contaminated.

I can imagine $\ce{KNO3}$ crystallizing and thereby occluding the active sites on the alumina but I'm not a chemist, so I've come here looking for better insight.

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