Fischer-Tropsch Synthesis: Modeling and Performance Study for Fe-HZSM5 Bifunctional Catalyst

Marvast, Mahdi Ahmadi; Sohrabi, Morteza; Zarrinpashne, Saeid; Baghmisheh, Gholamreza

doi:10.1002/ceat.200407013

Cited by 91 publications

(83 citation statements)

References 10 publications

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“…[121] Although a wide range of hydrocarbons are produced when using iron catalysts, a narrower distribution of gasoline products can be attained by using Fe/zeolite catalysts. For example, Figure 1 (adapted from [126]) shows the differences in product distribution in the C 1 -C 22 range by using a bifunctional catalyst consisting of 100 Fe/5.4 Cu/7 K 2 O/21 SiO 2 and HZSM-5 with a SiO 2 / Al 2 O 3 ratio of 28, as compared to the zeolite-free catalyst. HZSM-5 has been the preferred choice of acidic co-catalyst for the FTS bifunctional process because of its shape-selective properties, which limit the formation of hydrocarbons above the gasoline range, its highly acidic nature giving rise to an activity for acid-catalyzed reactions (cracking, oligomerization, isomerization, and aromatization), its medium pore size, which makes them highly resistant to coking, and its stability under hydrothermal conditions.…”

Section: Types Of Zeolites In Ftsmentioning

confidence: 99%

“…HZSM-5 has been the preferred choice of acidic co-catalyst for the FTS bifunctional process because of its shape-selective properties, which limit the formation of hydrocarbons above the gasoline range, its highly acidic nature giving rise to an activity for acid-catalyzed reactions (cracking, oligomerization, isomerization, and aromatization), its medium pore size, which makes them highly resistant to coking, and its stability under hydrothermal conditions. [121] Because of the increasing worldwide demand of gasoline and its higher price compared to diesel, [1,126] Fe/HZSM-5 is currently a favorable catalyst to shift the product distribution toward the formation of sulfur-free and high-octane gasoline-range isoparaffins and aromatics. [103,104,121,127,128] Multifunctional catalysts containing also ZSM-5 (SiO 2 /Al 2 O 3 = 83.7) and an iron-based FTS catalyst (Fe/ Cu/Mg/Ca/K), prepared by physically mixing both species at different ratios, led to an increased amount of isoparaffins in the C 1 -C 10 range, in contrast to the C 1 -C 16 range in the absence of a zeolite.…”

Section: Types Of Zeolites In Ftsmentioning

confidence: 99%

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Exploring Iron‐based Multifunctional Catalysts for Fischer–Tropsch Synthesis: A Review

2011

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The continuous increase in oil prices together with an increase in carbon dioxide concentration in the atmosphere has prompted an increased interest in the production of liquid fuels from non-petroleum sources to ensure the continuation of our worldwide demands while maximizing CO(2) utilization. In this sense, the Fischer-Tropsch (FT) technology provides a feasible option to render high value-added hydrocarbons. Alternative sources, such as biomass or coal, offer a real possibility to realize these purposes by making use of H(2)-deficient or CO(2)-rich syngas feeds. The management of such feeds ideally relies on the use of iron catalysts, which exhibit the unique ability to adjust the H(2)/CO molar ratio to an optimum value for hydrocarbon synthesis through the water-gas-shift reaction. Taking advantage of the emerging attention to hybrid FT-synthesis catalysts based on cobalt and their associated benefits, an overview of the current state of literature in the field of iron-based multifunctional catalysts is presented. Of particular interest is the use of zeolites in combination with a FT catalyst in a one-stage operation, herein named multifunctional, which offer key opportunities in the modification of desired product distributions and selectivity, to eventually overcome the quality limitations of the fuels prepared under intrinsic FT conditions. This review focuses on promising research activities addressing the conversion of syngas to liquid fuels mediated by iron-based multifunctional materials, highlights their preparation and properties, and discusses their implication and challenges in the area of carbon utilization through H(2)/CO(+CO(2)) mixtures.

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Section: Types Of Zeolites In Ftsmentioning

confidence: 99%

Section: Types Of Zeolites In Ftsmentioning

confidence: 99%

Exploring Iron‐based Multifunctional Catalysts for Fischer–Tropsch Synthesis: A Review

2011

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“…In 2005, Marvast et al [54] modeled a fixed-bed reactor for FTS with Fe-HZSM5 catalyst. They also studied the parameters which have effect on the reactor performance.…”

Section: Productsmentioning

confidence: 99%

“…The optimized H 2 /CO ratio for the reactor with this configuration is decided to be 0.8. The results for the optimum working conditions are shown in Table 3 [54].…”

Section: Productsmentioning

confidence: 99%

Progress in Reactors for High-Temperature Fischer–Tropsch Process: Determination Place of Intensifier Reactor Perspective

Saeidi¹,

Amiri

Amin³

et al. 2014

International Journal of Chemical Reactor Engineering

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High-temperature Fischer-Tropsch (HTFT) process aims to produce lighter cuts such as gasoline and diesel. For many years there have been studies and improvements on HTFT process to make the existing reactors more efficient. Recent studies proposed new configurations such as dual-type membrane reactor and coupling configurations reactor, which improved the performances of this process. This achievement persuades us to update the existing knowledge about the available reactors for HTFT process. In this article, features and performances overview of two classes of reactors are reviewed. The first class consists of the reactors which are based on older studies, and the second one includes recent studies which are called product intensifier reactors. Finally, it is shown that the product intensifier reactors have higher CO conversions and lower selectivity of undesired by-products which results in higher production yield of gasoline. Furthermore, the place of product intensifier reactor among common reactors with regard to the influence of the process parameters on the product distribution has been estimated.

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“…The Fischer-Tropsch synthesis (FTS) is considered as the heart of the XTL process [2] as it is responsible of converting syngas, a mixture of carbon monoxide (CO) and hydrogen (H 2 ), into various hydrocarbons that could be refined into environmentally ultra-clean liquid fuels and value added chemicals [3] [4]. The FTS is a surface catalyzed process (heterogeneous catalytic reaction) in which syngas reacts on an active catalyst site; usually cobalt (Co) or iron (Fe) producing longer chain gaseous, liquid and solid (wax) hydrocarbons composed mainly of n-paraffins, α-olefins, isomers, alkenes and oxygenates [5]- [8].…”

Section: Introductionmentioning

confidence: 99%

Product Analysis of Supercritical Fischer-Tropsch Synthesis: Utilizing a Unique On-Line and Off-Line Gas Chromatographs Setup in a Bench-Scale Reactor Unit

Kasht¹,

Hussain²,

Ghouri³

et al. 2015

AJAC

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The utilization of supercritical fluids (SCF) in the Fischer-Tropsch Synthesis (FTS) further complicates the hydrocarbon products identification and analysis process due to the dilution of hydrocarbon peaks by the predominant solvent peak. Therefore, in this project, a custom-made Gas Chromatography (GC) analysis system was designed and implemented to identify and quantify SCF-FTS products. The FTS products were identified using two different methods. The first was through retention time matching by injecting standard solutions, and the second was through the use of the GC/MS system. The quantification of CO and CH4 was achieved by using external standards, where the CO conversion was calculated by relating the peak area of CO to the peak area of an internal standard (argon) while the CH4 selectivity was calculated by relating the peak area of CH4 to that of CO. After setting and calibrating the GC system, two reaction conditions (gas phase: 240˚C, 20 bar syngas with 2:1 H2:CO molar feed ratio and for the supercritical fluids FTS (SCF-FTS): 240˚C, 65 bar with 20 bar syngas partial pressure and 2:1 H2:CO molar feed ratio) were used to compare the different FTS reaction media. The comparison between the gas phase FTS and the SCF-FTS showed the following: carbon monoxide conversion was improved by 14% in the SCF-FTS, while the hydrocarbon product profile SCF-FTS showed 78% reduction in light hydrocarbons (C1 -C4) products, 35% increase in middle distillates (C11 -C22) products compared to gas phase FTS. These improvements have resulted in higher chain growth probability for the SCF-FTS (α = 0.85) compared to the gas phase FTS (α = 0.76). These results are generally in agreement with previously reported enhancement in the SCF-FTS [1].

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Fischer-Tropsch Synthesis: Modeling and Performance Study for Fe-HZSM5 Bifunctional Catalyst

Cited by 91 publications

References 10 publications

Exploring Iron‐based Multifunctional Catalysts for Fischer–Tropsch Synthesis: A Review

Exploring Iron‐based Multifunctional Catalysts for Fischer–Tropsch Synthesis: A Review

Progress in Reactors for High-Temperature Fischer–Tropsch Process: Determination Place of Intensifier Reactor Perspective

Product Analysis of Supercritical Fischer-Tropsch Synthesis: Utilizing a Unique On-Line and Off-Line Gas Chromatographs Setup in a Bench-Scale Reactor Unit

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