Mechanistic Aspects of the Formation of Hydrocarbons and Alcohols from CO Hydrogenation

Graves Nunataks 95209: A snapshot of metal segregation and core formation

“…Like those observations, the grains studied here consist of poorly crystallized graphite in intimate association with larger crystals of FeNi metal, in some cases with evidence for carbide at metal-C interfaces. These microstructures match those formed by catalytic reaction of C-bearing gases such as CO on metal surfaces to produce hydrocarbons, elemental carbon, and carbides (e.g., Fischer-Tropsch-type or FTT processes, Hindermann et al, 1993;Llorca and Casanova, 1998) and this appears to have played a role in forming the structures observed both in IDPs and in ordinary chondrites (Bradley et al, 1984;Brearley, 1990;Llorca and Casanova, 1998). The similarity of the graphite grains in the metalpoor lithology of GRA 95209 to these other materials indicates that they most likely formed by a similar process.…”

Recent Progresses in Understanding of Co-Based Fischer–Tropsch Catalysis by Means of Transient Kinetic Studies and Theoretical Analysis

“…There are two used methods to construct the DFT models containing defects, where one is creating the defect by removing certain atoms on the low Miller index orientations (such as stepped Co (0001)) [33,36,116,120] and the other is using the model based on the high Miller index orientations that produce corrugated surfaces [113,118,131]. Ge et al [118] studied the effect of defects on CO dissociation by employing the Co (11)(12)(13)(14)(15)(16)(17)(18)(19)(20), Co (10-12) and Co (11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22)(23)(24) as model surfaces shown in Fig. 3, in which Co (11)(12)(13)(14)(15)(16)(17)(18)(19)(20) is more open and corrugated than Co (0001), Co (10-12) contains steps and Co (11)(12)(13)(14)(15)…”

“…Ge et al [118] studied the effect of defects on CO dissociation by employing the Co (11)(12)(13)(14)(15)(16)(17)(18)(19)(20), Co (10-12) and Co (11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22)(23)(24) as model surfaces shown in Fig. 3, in which Co (11)(12)(13)(14)(15)(16)(17)(18)(19)(20) is more open and corrugated than Co (0001), Co (10-12) contains steps and Co (11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22)(23)(24) contains double steps and kinks. As expected, the barrier of CO dissociation decreases in the order Co (11)…”

“…The investigation of the FT mechanism CO Dissociation and Hydrogenation (H 2 )ads Fig. 1 Three main mechanisms of Fischer-Tropsch synthesis [22]. a Carbide mechanism.…”

A Self-Perpetuating Catalyst for the Production of Complex Organic Molecules in Protostellar Nebulae

“…The Fischer-Tropsch-type (FTT) catalytic reduction of CO by hydrogen to produce methane and other hydrocarbons was once the preferred model for production of organic materials in the primitive solar nebula (Hayatsu & Anders 1981;Pearce et al 1989;Hindermann et al 1993). The Haber-Bosch (HB) catalytic reduction of N 2 by hydrogen to make ammonia was thought to produce the reduced nitrogen found in meteorites.…”