Abstract
The decomposition of acetic acid upon reaction with the free mass-selected manganese oxide clusters Mn3O3+ and Mn4O4+ was studied in an octopole ion trap under well-defined reaction conditions. Three distinct reaction channels have been identified: (1) the decarboxylation of acetic acid to CO2, (2) in the case of Mn3O3+ the dehydration of acetic acid to ketene in competition with the decarboxylation, and (3) the deprotonation of the acid. The latter was found to represent the major reaction channel for both investigated cluster ions. The observation of the manganese oxide cluster mediated decomposition of acetic acid represents an important first step for future investigations aiming at the development of new materials for the selective catalytic ketene production.
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