Catalytic behaviors of bifunctional Fe-HZSM-5 catalyst in Fischer–Tropsch synthesis

Pour, Ali Nakhaei; Zare, Masoud; Shahri, Seyed Mehdi Kamali; Zamani, Yahya; Alaei, Mohammad Reza

doi:10.1016/j.jngse.2009.11.003

Cited by 33 publications

(18 citation statements)

References 28 publications

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“…In contrast, higher CO conversions and C5-C11 selectivity were obtained in 1BED when a La-promoted Fe was studied. 55 The improved performance of 1BED over 2BED systems in terms of increased selectivities to gasoline-range hydrocarbons is in line with results reported for Co-based catalysts. 40,41,54 Schaub et al 40,41 reveal that under the applied process conditions, the C10-C20 molar fraction may be larger in the 2BED configuration than in the 1BED, while both systems represent similar fractions of liquid hydrocarbons (C5-C20).…”

Section: Reactor Levelsupporting

confidence: 84%

Catalysis engineering of bifunctional solids for the one-step synthesis of liquid fuels from syngas: a review

Sartipi

Makkee

Kapteijn

et al. 2014

Catal. Sci. Technol.

158

103

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Section: Reactor Levelsupporting

confidence: 84%

Catalysis engineering of bifunctional solids for the one-step synthesis of liquid fuels from syngas: a review

Sartipi

Makkee

Kapteijn

et al. 2014

Catal. Sci. Technol.

158

103

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“…Both redox and acid components are typically involved to both reactors for the successive and parallel transformations to the target value‐added products. For instance, methanol, DME and olefins intermediates formed from syngas on metal components by COx hydrogenation are converted into aromatics exclusively on the HZSM‐5 either by a single‐bed catalyst, where two catalytic components are constructed under the same working conditions or dual‐bed catalysts in which two catalytic components separated through quartz wool spacer in a same tubular reactor ( Figure a) . Besides, a dual catalytic‐bed arrangement with separate reactors, where the active metal and zeolite components can work in different temperatures, are also reported in order to regenerate both components independently .…”

Section: Introductionmentioning

confidence: 99%

Recent Advances in Direct Synthesis of Value‐Added Aromatic Chemicals from Syngas by Cascade Reactions over Bifunctional Catalysts

2019

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Value‐added aromatic monomers such as benzene, toluene, and xylenes (BTX) are very important building‐block chemicals for the production of plastics, polymers, solvents, pesticides, dyes, and adhesives. Syngas‐to‐aromatics (STA) is a very promising approach for the synthesis of aromatic monomers, and is catalyzed via bifunctional catalysts in a single reactor, wherein methanol/dimethyl ether and/or olefins intermediates formed from syngas on metal components are converted into aromatic monomers exclusively on the HZSM‐5 by cascade reactions. Since an optimal Fischer–Tropsch synthesis (FTS) temperature of Fe‐based catalysts is very close to an aromatization temperature of HZSM‐5, Fe‐based catalysts have been frequently used/modified for the synthesis of aromatic monomers from hydrogenation of carbon oxides (CO and CO2). The nature of metal components and amounts of Brönsted acid sites on HZSM‐5, and their mesoporosity and intimacy, significantly alter the selectivity for aromatics by tuning BTX distibution and catalyst stability. Although many developments have been achieved regarding the STA process in recent years, no reviews have been published in this flourishing research area over the last two decades. Here, the recent advances and forthcoming challenges in the progress of syngas (CO+H2) chemistry and hydrogenation of CO2 toward the value‐added aromatic monomers through cascade reactions are highlighted.

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“…Aromatic compounds such as benzene, toluene, xylene and trimethylbenzene are important raw materials in the chemical industry; they are collected as by-products of coal coking or derived from processes of catalytic reforming and gasoline cracking. There are various routes for the conversion of natural gas into aromatic hydrocarbons, e.g., the direct aromatization route [2][3][4], syngas route [5][6][7], chloride route [8][9][10][11][12], and bromide route [13][14][15]. Recently, we reported a new route: first CH 3 Br is formed from CH 4 using HBr/H 2 O as mediator in the presence of oxygen, and then CH 3 Br is catalytically transformed into hydrocarbons or compounds of high carbon number [16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of H-ZSM-5 zeolites and their catalytic performance in CH3Br conversion to aromatics

Tao

Yin

et al. 2011

Reac Kinet Mech Cat

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Described in this paper are the synthesis, characterization and catalytic application of H-ZSM-5 zeolites for the conversion of CH 3 Br into aromatics. The H-ZSM-5 zeolites were fabricated by hydrothermal crystallization using n-butylamine (BTA) as a template and characterized by XRD, SEM and NH 3 -TPD techniques. The effects of batch SiO 2 /Al 2 O 3 ratio, alkalinity, NaCl/Al 2 O 3 ratio, seed crystals, and crystallization time on the yield, structure/texture and catalytic performance were systematically studied. Adopting the optimum sol (SiO 2 /Al 2 O 3 = 70, BTA/SiO 2 = 0.2847, Na 2 O/SiO 2 = 0.1237, H 2 O/SiO 2 = 37.4, NaCl/Al 2 O 3 = 60, and seed/SiO 2 = 5 wt%) and under the most preferable crystallization conditions of 100°C/24 h-170°C/24 h, H-ZSM-5 zeolites of high crystallinity and small size (300-700 nm) were obtained. Good catalytic performance was observed over the H-ZSM-5 zeolites (aromatic yield up to 44.2%). However, unlike the modification of large commercial HZSM-5, the use of MoO 3 or PbO as modifying agents for the small-size H-ZSM-5 zeolites results in a decline of catalytic performance. The relationship between the structure and the catalytic efficiency of as-synthesized H-ZSM-5 samples were investigated. It was found that with crystallinity enhancement and/or decline in crystal size, there is improvement of catalytic performance.

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Catalytic behaviors of bifunctional Fe-HZSM-5 catalyst in Fischer–Tropsch synthesis

Cited by 33 publications

References 28 publications

Catalysis engineering of bifunctional solids for the one-step synthesis of liquid fuels from syngas: a review

Catalysis engineering of bifunctional solids for the one-step synthesis of liquid fuels from syngas: a review

Recent Advances in Direct Synthesis of Value‐Added Aromatic Chemicals from Syngas by Cascade Reactions over Bifunctional Catalysts

Synthesis and characterization of H-ZSM-5 zeolites and their catalytic performance in CH3Br conversion to aromatics

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