Abstract
Sol–gel Pd/alumina promoted by oxygen-storing CeO2 or CeO2–Tb4O7 catalysts has higher hydrocarbon oxidation activity than commercial three-way catalysts. It is active in hydrocarbon (and CO) oxidation even under net reducing conditions albeit over short periods of time. This observation is relevant to cold start conditions. Cryo-focussing GCMS and pulse RGA experiments suggest that mechanistically interesting by-product hydrocarbon species evolve from the catalysts under just these conditions, even when the fuel is LPG in type. Further catalyst developments and analytical refinements are likely to go hand in hand as the mode of operation of these environmental catalysts is better understood from their by-product fingerprint.
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