Effect of magnesia on alumina-supported cobalt Fischer–Tropsch synthesis catalysts

Zhang, Yuhua; Xiong, Haifeng; Liew, Kongyong; Li, Jinlin

doi:10.1016/j.molcata.2005.04.057

Cited by 111 publications

(57 citation statements)

References 45 publications

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“…Similar results have been reported by Zhang et al using a Mg promoter in Co/Al 2 O 3 catalysts. 256 They observed that the addition of Mg decreased the formation of a cobalt surface phase, which was detected by XPS. Small amounts of Mg were found to increase the catalyst activity by means of decreasing the formation of Co aluminates.…”

Section: Transition Metal Oxide Promotion Effects Many Transition Mementioning

confidence: 96%

“…-The following chemical elements have been investigated as promoters in Co-based F-T catalysis: B, Mg, K, Ti, V, Cr, Mn, Ni, Cu, Zr, Nb, Mo, Ru, Rh, Pd, La, Re, Ir, Pt, Ce, Gd and Th. [247][248][249][250][251][252][253][254][255][256][257][258][259][260][261] Taking the above described classification scheme, we have made an attempt to identify for every reported promoter element its beneficial effect for Co F-T catalysis. The result of this effort is summarized in Table 3 3.2.1.1 Ruthenium.…”

Section: Overview Of the Promoter Elements Used Inmentioning

confidence: 99%

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Promotion Effects in Co‐Based Fischer—Tropsch Catalysis

Morales¹,

Weckhuysen²

2006

ChemInform

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Section: Transition Metal Oxide Promotion Effects Many Transition Mementioning

confidence: 96%

Section: Overview Of the Promoter Elements Used Inmentioning

confidence: 99%

Promotion Effects in Co‐Based Fischer—Tropsch Catalysis

Morales¹,

Weckhuysen²

2006

ChemInform

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“…Zhang et al [91] considered the performance of a cobalt-based alumina supported F-T catalyst by modification of the support by magnesia. The performance of the magnesia-modified catalyst was examined in F-T synthesis and it was concluded that the activity of the catalyst in terms of carbon monoxide conversion was increased due to improvement in reducibility of the catalyst.…”

Section: Overview Of Previous Work Regarding the Fischer-tropsch Synmentioning

confidence: 99%

A review of Fischer Tropsch synthesis process, mechanism, surface chemistry and catalyst formulation

Mahmoudi

Doustdar

et al. 2017

Biofuels Engineering

165

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For more than half a century, Fischer-Tropsch synthesis (FTS) of liquid hydrocarbons was a technology of great potential for the indirect liquefaction of solid or gaseous carbon-based energy sources (Coal-To-Liquid (CTL) and Gas-To-Liquid (GTL)) into liquid transportable fuels. In contrast with the past, nowadays transport fuels are mainly produced from crude oil and there is not considerable diversity in their variety. Due to some limitations in the first generation bio-fuels, the Second-Generation Biofuels (SGB)' technology was developed to perform the Biomass-To-Liquid (BTL) process. The BTL is a well-known multi-step process to convert the carbonaceous feedstock (biomass) into liquid fuels via FTS technology. This paper presents a brief history of FTS technology used to convert coal into liquid hydrocarbons; the significance of bioenergy and SGB are discussed as well. The paper covers the characteristics of biomass, which is used as feedstock in the BTL process. Different mechanisms in the FTS process to describe carbon monoxide hydrogenation as well as surface polymerization reaction are discussed widely in this paper. The discussed mechanisms consist of carbide, COinsertion and the hydroxycarbene mechanism. The surface chemistry of silica support is discussed. Silanol functional groups in silicon chemistry are explained extensively. The catalyst formulation in the Fischer Tropsch (F-T) process as well as F-T reaction engineering is discussed. In addition, the most common catalysts are introduced and the current reactor technologies in the F-T indirect liquefaction process are considered. process overview IntroductionThe over-reliance of the world's nations on conventional fossil fuels puts our planet in peril. The continuity of the current situation will result in the rise of a combined average temperature over global land and ocean surfaces by 5 ∘ C in 2100, bringing a rise in sea levels, food and water shortages and an increase in extreme weather events. The global warming, caused by humans, is one of the biggest threats to our future well-being [1]. In addition, oil reserves are limited and these reserves are decreasing dramatically. This reduction alongside the other relevant economic factors affects the world's oil prices. The need to run engines with the new generation of liquid fuels is inevitable. The investigations by the US Energy Information Administration (EIA) published in 2013 expressed a 56 percent increase in the world's energy consumption by the year 2040. Total world energy demand will have risen to 865 EJ (exajoule) by this year. The total world energy consumption was reported as 553 EJ in 2010. The outlook indicates that renewable energy is one of the fastest-growing energy sources in the world; where its usage increases 2.5 percent per year. Despite increasing success in the renewable energies, it is predicted that the fossil fuels will supply al-

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“…Consequently the equation of plug reactor changed as follows: (6) (7) Therefore as a brief: (8) and hence: (9) 3. Results and Discussion…”

Section: Catalyst Testingmentioning

confidence: 99%

“…Because of producing low aromatics [3], zero sulfur [4], and low pollutant emission [5], FTS has been regarded as one of the most technical feasible process for environmental conversion of natural gas into ultra-clean liquid products [6,7]. The FTS process was shown to be catalyzed by certain transition metals, such as: Co, Fe, and Ru, which present the highest activity [8]. Up to now, only iron and cobalt based catalysts have been found to be cost-effective and economical for industrial application [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Effect of Drying Conditions on the Catalytic Performance, Structure, and Reaction Rates over the Fe-Co-Mn/MgO Catalyst for Production of Light Olefins

Abdouss

Arsalanfar

Mirzaei

et al. 2017

Bull. Chem. React. Eng. Catal.

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The MgO-supported Fe-Co-Mn catalysts, prepared using co-precipitation procedure, were tested for production of light olefins via CO hydrogenation reaction. The effect of a range of drying conditions including drying temperature and drying time on the structure and catalytic performance of Fe-Co-Mn/MgO catalyst for Fischer-Tropsch synthesis was investigated in a fixed bed micro-reactor under the same operational conditions of T = 350 °C, P = 1 bar, H2/CO = 2/1, and GHSV = 4500 h -1 . It was found that the catalyst dried at 120 °C for 16 h has shown the best catalytic performance for CO hydrogenation. Furthermore, the effect of drying conditions on different surface reaction rates was also investigated and it was found that the precursors drying conditions influenced the rates of different surface reactions. Characterization of catalyst precursors and calcined samples (fresh and used) was carried out using powder X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDS), Brunauer-Emmett-Teller (BET) measurements, Temperature Programmed Reduction (TPR), Thermal Gravimetric Analysis (TGA), and Differential Scanning Calorimetry (DSC). Characterization results showed that different investigated variables (drying conditions) influenced the structure, morphology and catalytic performance of the ternary catalysts.

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Effect of magnesia on alumina-supported cobalt Fischer–Tropsch synthesis catalysts

Cited by 111 publications

References 45 publications

Promotion Effects in Co‐Based Fischer—Tropsch Catalysis

Promotion Effects in Co‐Based Fischer—Tropsch Catalysis

A review of Fischer Tropsch synthesis process, mechanism, surface chemistry and catalyst formulation

Effect of Drying Conditions on the Catalytic Performance, Structure, and Reaction Rates over the Fe-Co-Mn/MgO Catalyst for Production of Light Olefins

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