Studies on Transition Metals and Alloy Fischer-Tropsch Catalysts, Their Electronic and Bulk Properties. (I: Fe/MNO; II: Fe/TiO sub 2 ; III: Fe/Mord.). Final Report, July 1, 1982-September 30, 1983

摘要

The objectives were: (1) to characterize samples D1, 10% FeO/90% MnO, and D2, 48% FeO/52% MnO, under varying conditions of reduction (at 250 exp 0 C or 350 exp 0 C in H sub 2 ) and of syngas reaction 1:1 of CO:H sub 2 at 290 exp 0 C) and in some cases use CO only for reduction and to identify species by Moessbauer Spectroscopy and Magnetization (sigma/sub s) measurement; (2) similarly, to see if there is any metal (oxide)/support (Mordenite) interaction by the same techniques. The characterization was carried out with above techniques and the kinetic results for syngas were obtained on the above systems mostly at PETC. During reduction of Fe-oxide/Mn-oxide an intermediate Mn-ferrite phase was detected. After reduction, species such as Fe exp 0 +Fe exp 3+ +Fe exp 2+ in varying total proportions (45% at 290 exp 0 C and Fe exp 0 +Fe exp 2+ 75% were found at 350 exp 0 C). Syngas conversion showed Fe-carbides (Fe sub 2 C sub 2 +Fe sub 3 C) depending on the reaction conditions, and the composition of D sub 1 and D sub 2 . With the fresh gamma -Fe sub 2 O sub 3 (identified by Moessbauer) on Mordenites with varying ratios of SiO sub 2 /Al sub 2 O sub 3 , a decrease in (sigma/sub s/) was found with lowering of the ratios from 60 to 17. At 17% ratio (sigma/sub s/) was smallest and the change in the isomer shift was maximum, which established an interaction with the Broensted cities. 24 figures. (ERA citation 09:020539)