Fischer–Tropsch synthesis: characterization and catalytic properties of rhenium promoted cobalt alumina catalysts☆

Das, Tapan K.; Jacobs, Gary; Patterson, Patricia M.; Conner, Whitney A.; Li, Jinlin; Davis, Burtron H.

doi:10.1016/s0016-2361(02)00361-7

Cited by 230 publications

(121 citation statements)

References 26 publications

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“…This suggests that the direct contact between Re and Co is not necessary in order to obtain a promoting effect of the noble metal on catalyst reducibility. The spillover mechanism of enhancement of cobalt reduction is also consistent with non-variance of intrinsic site activity of cobalt catalysts after promotion with noble metals (Pt, Re) usually observed by SSITKA method [16,[41][42][43] or calculated by normalizing the overall FT reaction rate by the number of metal sites measured by H 2 chemisorption [13].…”

Section: Cobalt Reducibilitysupporting

confidence: 85%

“…Promotion with Re resulted in a double increase in the rate of hydrocarbon production, while methane and C5+ selectivities were not much affected. Das et al [13] observed a significant increase in FT reaction rate over Re-promoted catalysts in slurry continuous stirred tank reactor (CSTR). Jacobs et al [14] showed (Table 2) that promotion with platinum and ruthenium of alumina, titania and silica supported catalysts considerably increases FT reaction rate in a slurry reactor.…”

Section: Enhancement Of Catalytic Performancementioning

confidence: 99%

“…The improvements in cobalt reducibility may occur without any affect on cobalt dispersion as observed by Davis for CoRe/Al 2 O 3 catalysts [13]. While the improvement in cobalt reducibility has been observed with several noble metals (Pt, Ru, Pd, Ir, Re), platinum, rhenium and ruthenium seems to be the most efficient cobalt reducibility promoters [16,18,[27][28][29].…”

Section: Cobalt Reducibilitymentioning

confidence: 99%

See 2 more Smart Citations

Promotion of Cobalt Fischer-Tropsch Catalysts with Noble Metals: a Review

Diehl¹,

Khodakov²

2008

Oil & Gas Science and Technology - Rev. IFP

167

109

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Résumé-Promotion par les métaux nobles de catalyseurs Fischer-Tropsch à base de cobalt : une revue -La synthèse Fischer-Tropsch est une part essentielle du procédé XTL (X-To-Liquids, avec X = Gaz, Biomasse ou Charbon) qui convertit du gaz de synthèse en hydrocarbures pour carburants propres. Les catalyseurs à base de cobalt supportés sur des oxydes inorganiques constituent le meilleur compromis pour la production de paraffines à longues chaînes carbonées et de cires. L'efficacité du procédé FischerTropsch dépend très fortement de la performance du catalyseur à base de cobalt. La promotion de ce catalyseur par des métaux précieux peut très fortement améliorer ses performances. Cet article fait la revue des différents effets des métaux nobles sur la structure et la performance de catalyseurs à base de cobalt. Les impacts sur le coût et l'activité des catalyseurs apparaissent comme des éléments incontournables dans le design de catalyseurs performants pour la synthèse Fischer-Tropsch. (X-To-Liquids, with X = Gas, Biomass or Coal) Abstract -Promotion of Cobalt Fischer-Tropsch Catalysts with Noble Metals: a Review -FischerTropsch synthesis is a major part of XTL

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Section: Cobalt Reducibilitysupporting

confidence: 85%

Section: Enhancement Of Catalytic Performancementioning

confidence: 99%

Section: Cobalt Reducibilitymentioning

confidence: 99%

See 1 more Smart Citation

Promotion of Cobalt Fischer-Tropsch Catalysts with Noble Metals: a Review

Diehl¹,

Khodakov²

2008

Oil & Gas Science and Technology - Rev. IFP

167

109

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“…The review includes a detailed consideration and analysis of the mechanisms and processes of sintering, oxidation, aluminate formation, and coking and carbide formation and under what operating conditions each is important. They summarize their and others' previous findings that oxidation primarily occurs on small (<2 nm) cobalt crystallites and at high partial pressures of water [362][363][364][365][366]. Further, they highlight the potentially complicated transformations between CoO and aluminates [362,364,367].…”

Section: Case Study: Cobalt Based Fischer-tropsch (Ft) Catalyst Regenmentioning

confidence: 73%

Heterogeneous Catalyst Deactivation and Regeneration: A Review

2015

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Deactivation of heterogeneous catalysts is a ubiquitous problem that causes loss of catalytic rate with time. This review on deactivation and regeneration of heterogeneous catalysts classifies deactivation by type (chemical, thermal, and mechanical) and by mechanism (poisoning, fouling, thermal degradation, vapor formation, vapor-solid and solid-solid reactions, and attrition/crushing). The key features and considerations for each of these deactivation types is reviewed in detail with reference to the latest literature reports in these areas. Two case studies on the deactivation mechanisms of catalysts used for cobalt Fischer-Tropsch and selective catalytic reduction are considered to provide additional depth in the topics of sintering, coking, poisoning, and fouling. Regeneration considerations and options are also briefly discussed for each deactivation mechanism.

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“…In situ X-ray absorption spectroscopy (XAS) has been reported in the literature as an efficient tool for studying the rhenium cobalt catalyst used in the Fischer-Tropsch Process [10][11][12][13][14][15]. Since XAS is an element specific probe, information related to the local environment of each constituent, Co or Re, can be obtained in an independent manner [16].…”

mentioning

confidence: 99%

An In Situ XAS Study of the Cobalt Rhenium Catalyst for Ammonia Synthesis

et al. 2018

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A cobalt rhenium catalyst active for ammonia synthesis at 400 °C and ambient pressure was studied using in situ XAS to elucidate the reducibility and local environment of the two metals during reaction conditions. The ammonia reactivity is greatly affected by the gas mixture used in the pre-treatment step. Following H 2 /Ar pre-treatment, a subsequent 20 min induction period is also observed before ammonia production occurs whereas ammonia production commences immediately following comparable H 2 /N 2 pre-treatment. In situ XAS at the Co K-edge and Re L III -edge show that cobalt initiates reduction, undergoing reduction between 225 and 300 °C, whereas reduction of rhenium starts at 300 °C. The reduction of rhenium is near complete below 400 °C, as also confirmed by H 2 -TPR measurements. A synergistic co-metal effect is observed for the cobalt rhenium system, as complete reduction of both cobalt and rhenium independently requires higher temperatures. The phases present in the cobalt rhenium catalyst during ammonia production following both pre-treatments are largely bimetallic Co-Re phases, and also monometallic Co and Re phases. The presence of nitrogen during the reduction step strongly promotes mixing of the two metals, and the bimetallic Co-Re phase is believed to be a pre-requisite for activity.

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Fischer–Tropsch synthesis: characterization and catalytic properties of rhenium promoted cobalt alumina catalysts☆

Cited by 230 publications

References 26 publications

Promotion of Cobalt Fischer-Tropsch Catalysts with Noble Metals: a Review

Promotion of Cobalt Fischer-Tropsch Catalysts with Noble Metals: a Review

Heterogeneous Catalyst Deactivation and Regeneration: A Review

An In Situ XAS Study of the Cobalt Rhenium Catalyst for Ammonia Synthesis

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