Abstract

An alternate on–off gas injection method was newly developed in combination with gas phase thermal desorption spectrometry, which was applied to reveal the reduction of gas-phase cobalt oxide clusters, ConOm+, by carbon monoxide, CO, under thermalized conditions at variable temperatures. Co2O1+ and Co2O3+ were found to be reduced by CO, accompanied by the formation of CO2, Co2O1+ + CO → Co2+ + CO2, and Co2O3+ + CO → Co2+ + CO2 + O2 at high temperature. This method enables to identify evidently a pair of reactant and product species in the reduction of gas-phase metal oxide clusters.

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