Structure sensitivity of the Fischer-Tropsch reaction on cobalt single crystals

Geerlings, J.J.C.; Zonnevylle, M.C.; Groot, C.P.M. De

doi:10.1016/0039-6028(91)90091-6

Cited by 98 publications

(78 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In contrast direct CO dissociation was found to proceed with lower activation energies than hydrogen assisted CO dissociation on corrugated surfaces [54,55]. Surface science studies, furthermore, confirm that undercoordinated sites are active for direct CO dissociation [51,[62][63][64]. With respect to the structure sensitivity of the FTS reaction, ab initio calculated activation energies for both the direct or the H assisted CO dissociation depend on the type of active site.…”

Section: Reaction Mechanismmentioning

confidence: 59%

A Single-Event MicroKinetic model for the cobalt catalyzed Fischer-Tropsch Synthesis

Belleghem

Ledesma

Yang

et al. 2016

Applied Catalysis A: General

View full text Add to dashboard Cite

Section: Reaction Mechanismmentioning

confidence: 59%

A Single-Event MicroKinetic model for the cobalt catalyzed Fischer-Tropsch Synthesis

Belleghem

Ledesma

Yang

et al. 2016

Applied Catalysis A: General

View full text Add to dashboard Cite

“…In the carbide mechanism dissociation of the CO bond precedes carbon-carbon coupling, which in this mechanism proceeds via an oxygen-free C 1 H x monomer species. Surface science studies show that dissociation of CO is energetically feasible on surfaces of metals such as Ni, Co and Ru [30][31][32][33][34][35]. The same is true for CO dissociation on C-vacant sites of iron carbides such as Fe 5 C 2 [13] , a system studied by computational means.…”

Section: Co Activation and Oxygen Hydrogenationmentioning

confidence: 94%

Reflections on the Fischer-Tropsch synthesis: Mechanistic issues from a surface science perspective

2016

View full text Add to dashboard Cite

“…For single-crystalline surfaces, different results concerning carbon monoxide dissociation can be found in the literature: on CoA C H T U N G T R E N N U N G (0001) [28] and CoA C H T U N G T R E N N U N G (101 0) [29] only molecular adsorption was observed, whereas evidence for dissociative adsorption was reported for the higher-index surfaces CoA C H T U N G T R E N N U N G (112 0) [28] and CoA C H T U N G T R E N N U N G (101 2). [30,31] Activation of the (0001) surface for carbon monoxide dissociation was achieved by deposition of magnesia as a promoter [32] or by sputtering with argon ions. [33] For nanoparticles grown under UHV conditions, carbon monoxide dissociation has not been reported so far to the best of our knowledge.…”

Section: Introductionmentioning

confidence: 99%

UHV Studies of Methanol Decomposition on Mono‐ and Bimetallic CoPd Nanoparticles Supported on Thin Alumina Films

et al. 2008

View full text Add to dashboard Cite

Bimetallic nanoparticles often turn out to be superior to the corresponding monometallic systems with respect to their catalytic properties. To study such effects for the methanol decomposition reaction, model catalysts were prepared by physical vapor deposition of Pd and Co under ultrahigh-vacuum (UHV) conditions. Monometallic Pd and Co particles as well as CoPd core-shell particles were generated on an epitaxial alumina film grown on NiAl(110). The interaction with methanol is examined by temperature-programmed desorption of methanol and carbon monoxide and by X-ray photoelectron spectroscopy. The decomposition of methanol proceeds in two reaction pathways independent of the particle composition: complete dehydrogenation towards carbon monoxide and hydrogen, and C--O bond scission yielding carbon deposits. Pd is the most active material studied here. The relative importance of the two channels varies for the different particle systems: on Pd dehydrogenation is preferred, whereas the C--O bond cleavage is more pronounced on Co. The bimetallic clusters show a moderate performance for both pathways. Carbon deposition poisons the model catalysts by blocking the adsorption sites for methoxide, which is the first intermediate product during methanol decomposition. In particular on Co, large amounts of carbon deposits can also be caused by dissociation of the final product of the dehydrogenation pathway, carbon monoxide. A comparison with the results of methanol decomposition on Co, Pd, and CoPd catalysts in continuous-flow reactors demonstrates that the findings of the present UHV study are relevant for catalytic performance under high-pressure conditions.

show abstract

Structure sensitivity of the Fischer-Tropsch reaction on cobalt single crystals

Cited by 98 publications

References 7 publications

A Single-Event MicroKinetic model for the cobalt catalyzed Fischer-Tropsch Synthesis

A Single-Event MicroKinetic model for the cobalt catalyzed Fischer-Tropsch Synthesis

Reflections on the Fischer-Tropsch synthesis: Mechanistic issues from a surface science perspective

UHV Studies of Methanol Decomposition on Mono‐ and Bimetallic CoPd Nanoparticles Supported on Thin Alumina Films

Contact Info

Product

Resources

About