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The water–gas shift performances of Cu/ZnO and Cu/ZnO/Al 2 O 3 catalysts in the challenging shut-down/start-up operation were investigated. The Cu/ZnO catalyst showed comparable activity to the Cu/ZnO/Al 2 O 3 catalyst but better stability in shut-down/start-up cycles, although the latter had much higher Cu surface area and smaller Cu crystallite size. The Cu–ZnO interface...
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