Activity, selectivity and attrition characteristics of supported iron Fischer–Tropsch catalysts

O’Brien, Robert; Xu, Liguang; Bao, Shiqi; Raje, Ajoy; Davis, Burtron H.

doi:10.1016/s0926-860x(99)00462-7

Cited by 74 publications

(83 citation statements)

References 5 publications

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“…Pertinent to the present study the authors stated that this catalyst rapidly disintegrated to 1−3 µm particles during stirring in STSR in nitrogen atmosphere. Similarly, O'Brien et al [11] reported that spray-dried and calcined Fe/Cu/K/SiO 2 catalyst particles in the 30−50 µm range disintegrated to 1−3 µm particles during 24 h of stirring under inert gas as well as under synthesis conditions. Apparently, these catalysts, even though of spherical shape, are much weaker than catalysts used in the present study.…”

Section: Comparison Of Attrition Behavior Of Iron F−t Catalystsmentioning

confidence: 91%

“…In several of these studies it was found that precipitated Fe catalysts (both irregularly shaped and spherical particles) are not attrition resistant [5][6][7][8]10,11], whereas some researchers [10,12,13,15] were successful in preparing Fe F−T catalysts with adequate attrition strength using spray drying method to produce nearly spherical particles. Attrition and agglomerate strength are complex phenomena that are not well understood.…”

Section: Introductionmentioning

confidence: 99%

“…There have been only a few studies of attrition properties in a SBCR and/or STSR under F−T reaction conditions. Zhao et al [9] and Wei et al [14] studied attrition properties of supported cobalt-based F−T catalysts in a SBCR, whereas O'Brien et al [11] conducted a similar study with supported Fe catalysts in a STSR.…”

Section: Introductionmentioning

confidence: 99%

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Improved Iron Catalysts for Slurry Phase Fischer-Tropsch Synthesis

Bukur¹,

Carreto-Vazquez²,

Ma³

2004

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This report describes research conducted to support the DOE program in development of improved (attrition resistant) catalysts for converting coal-derived synthesis gas to liquid fuels via slurry phase Fischer−Tropsch (F−T) synthesis. The primary objective of this research program is to develop highly active and selective attrition resistant iron F−T catalysts by spray drying.Attrition strength of various types of iron F−T catalysts was studied under reaction conditions in a stirred tank slurry reactor (STSR). The attrition behavior was evaluated on the basis of observed changes in morphological properties (via SEM), and changes in particle size distribution after F−T synthesis in the STSR.Three spray-dried catalysts (100 Fe/3 Cu/5 K/16 SiO 2 in parts by weight) prepared from wet precursors at Texas A&M University had excellent sphericity and smooth external surfaces. Their particle size distribution was rather broad ranging from 5 µm to 40 µm in diameter, regardless of the source of silica (colloidal silica, TEOS, or potassium silicate) employed in their preparation. The catalyst prepared from colloidal silica had the highest attrition strength among all catalysts studied during the course of this project. After 345 h of testing in the STSR its morphology remained practically unchanged, and it experienced small reductions in the volume mean diameter (5.4 %) and generation of particles smaller than 10 µm in diameter was very small (0.7 %). Catalytic performance of these catalysts was excellent. Syngas conversion was between 71 and 76 %, whereas methane selectivity was between 2.2 and 3.5 % and that of C 5 + hydrocarbons was 78 % to 86 % (all selectivities are on C−atom basis).Spray-dried catalysts, synthesized at Hampton University, with compositions 100 Fe/5 Cu/4.2 K/11 SiO 2 and 100 Fe/5 Cu/4.2 K/1.1 SiO 2 had excellent selectivity characteristics (methane selectivity of 2 %, and C 5 + selectivity of about 85 %) but their activity and stability (deactivation rate) need to be improved. Spray-dried HU1112 catalyst (100 Fe/3 Cu/4 K/16 SiO 2 produced more methane (3.5 %) and less C 5 + hydrocarbons (77 %) than the other two spray-dried catalysts.

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Section: Comparison Of Attrition Behavior Of Iron F−t Catalystsmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

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Improved Iron Catalysts for Slurry Phase Fischer-Tropsch Synthesis

Bukur¹,

Carreto-Vazquez²,

Ma³

2004

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“…The major relevant finding from previous studies has been that precipitated unsupported Fe F-T catalysts disintegrate easily into smaller particles [6,14,15]. In several studies it was found that even some spray-dried Fe F-T catalysts are not attrition resistant [12,[16][17][18]. However, Goodwin and coworkers [4,13,19], and Pham and coworkers [11,15] were able to prepare Fe based F-T catalysts of sufficient attrition resistance using a spray drying method.…”

Section: Executive Summarymentioning

confidence: 99%

Attrition Resistant Fischer-Tropsch Catalysts Based on FCC Supports

Adeyiga¹

2010

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“…Unsupported iron FT catalysts are limited by their weak mechanical strength making them a poor option for slurry-bubble column reactors, the most thermally efficient and economical FT reactors [3]. Unfortunately, supported iron FT catalysts have historically had poor activities and selectivities making them commercially unavailable [4][5][6]. Potassium and copper are structural promoters often used in industrial iron FT catalysts.…”

Section: Introductionmentioning

confidence: 99%

Effect of Support Pretreatment Temperature on the Performance of an Iron Fischer–Tropsch Catalyst Supported on Silica-Stabilized Alumina

et al. 2018

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Abstract:The effect of support material pretreatment temperature, prior to adding the active phase and promoters, on Fischer-Tropsch activity and selectivity was explored. Four iron catalysts were prepared on silica-stabilized alumina (AlSi) supports pretreated at 700 • C, 900 • C, 1100 • C or 1200 • C. Addition of 5% silica to alumina made the AlSi material hydrothermally stable, which enabled the unusually high support pretreatment temperatures (>900 • C) to be studied. High-temperature dehydroxylation of the AlSi before impregnation greatly reduces FeO·Al 2 O 3 surface spinel formation by removing most of the support-surface hydroxyl groups leading to more effectively carbided catalyst. The activity increases more than four-fold for the support calcined at elevated temperatures (1100-1200 • C) compared with traditional support calcination temperatures of <900 • C. This unique pretreatment also facilitates the formation of ε -Fe 2.2 C rather than χ-Fe 2.5 C on the AlSi support, which shows an excellent correlation with catalyst productivity.

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Activity, selectivity and attrition characteristics of supported iron Fischer–Tropsch catalysts

Cited by 74 publications

References 5 publications

Improved Iron Catalysts for Slurry Phase Fischer-Tropsch Synthesis

Improved Iron Catalysts for Slurry Phase Fischer-Tropsch Synthesis

Attrition Resistant Fischer-Tropsch Catalysts Based on FCC Supports

Effect of Support Pretreatment Temperature on the Performance of an Iron Fischer–Tropsch Catalyst Supported on Silica-Stabilized Alumina

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