New experiments at the interface of a dense flow reactor and molecular beam show that free Fe clusters are extraordinarily reactive toward O2 and H2S but unreactive toward methane. These results are believed to represent the true low-temperature reactivities of free Fe clusters, with molecular addition of O2 (e.g., FexO2 for 2 ≤ x ≤ 15) and formation of dehydrogenated sulfides (FexS) observed as primary chemical processes. Significantly, no reaction of any of these small molecules with the Fe atom has been detected, and after large increases for smallest clusters the apparent reactivity toward H2S or O2 levels off for clusters x > 6.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry