Abstract
Abstract The method for in situ characterization of surface transformations on heterogeneous catalyst is described. The method is based on the measurements of thermal electron and ion emissions from the catalyst surface. It is demonstrated by investigating the depassivation process of undoped and K-doped Mo 2 C catalysts exposed to air after synthesis and use to identify characteristic steps of reduction-carburization by flowing CH 4 /H 2 gas mixture. The information obtained from thermal emission experiments is consistent with the methane consumption profile, which provided an independent observation of the recarburization step.
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