Abstract
The transient method has been used to study the H 2 CO reaction over 10% Fe Al 2 O 3 and 10% Fe SiO 2 at 1 atm and 285 °C in a differential reactor. Responses to perturbations in the feed composition to the reactor were measured by on-line mass spectrometry. Additional studies were made with the reactants CO He , C 2 H 4 H 2 , and C 2 H 4 He . The effect of water in the feed was also investigated. The nature of the species remaining on the surface or in the bulk of the iron was investigated by hydrogen and by oxygen flushing. The observations are explained by proposing a common surface carbon precursor to the formation of surface CH, surface carbidic carbon, surface graphitic carbon, and bulk iron carbides.
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