Studies of Macroporous Structured Alumina Based Cobalt Catalysts for Fischer–Tropsch Synthesis

Phan, Xuyen Kim; Yang, Jia; Bakhtiary-Davijnay, Hamidreza; Myrstad, Rune; Venvik, Hilde J.; Holmén, Anders

doi:10.1007/s10562-011-0702-3

Cited by 12 publications

(7 citation statements)

References 23 publications

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“…In order to take advantage of the catalytic performance offered by α-Al 2 O 3 , a new macroporous structured (MPS-Al 2 O 3 ) support was synthesized from α-Al 2 O 3 nanoparticles to improve the supported cobalt dispersion. 128 The results obtained with this new support combine the benefits obtained of α-Al 2 O 3 and γ-Al 2 O 3 as supports, displaying similar catalytic performance compared to conventional Co/γ-Al 2 O 3 and Co/α-Al 2 O 3 catalysts, respectively. The kinetic parameters such as intrinsic rate constant and site coverage of intermediates leading to methane remains unchanged as Co/ α-Al 2 O 3 , whereas the number of active intermediates has increased substantially due to better cobalt dispersion on MPS-Al 2 O 3 .…”

Section: Study Of Fischer−tropsch Synthesis By Ssitkasupporting

confidence: 58%

Recent Approaches in Mechanistic and Kinetic Studies of Catalytic Reactions Using SSITKA Technique

et al. 2014

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One of the most useful techniques to obtain valuable information on catalyzed heterogeneous reactions at, or near to, molecular level is the Steady-State Isotopic Transient Kinetic Analysis (SSITKA). Kinetic parameters of catalyst-surface reaction intermediates, such as concentration, site coverage, reactivity, and rate constants can be obtained and processed to provide valuable information about the reaction mechanism. This technique has been extensively tested in a wide range of different surface-catalyzed reactions, where the influence of different parameters on the intermediates has been studied (i.e., supports, active phases, particle size, addition of promoters). Progresses in the coupling of spectroscopic techniques and advanced modeling could greatly improve the understanding of the surface reaction mechanism and provide more reliable kinetic models. This review compiles the main goals achieved up to date in heterogeneous catalytic systems using SSITKA and analyzes the perspectives of this technique in the near future.

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Section: Study Of Fischer−tropsch Synthesis By Ssitkasupporting

confidence: 58%

Recent Approaches in Mechanistic and Kinetic Studies of Catalytic Reactions Using SSITKA Technique

et al. 2014

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“…Issues explored using SSITKA have included among others the study of mechanisms, the presence and implications of site heterogeneity, the role of chemical promoters and the effect of operation conditions on the surface coverage of intermediates. For FTS, the use of SSITKA has resulted in an improved understanding on the effect of catalyst properties (promoters [72][73][74][75][76][77][78][79][80][81][82][83], support [84][85][86][87][88][89][90], particle size etc. [91][92][93][94]) and the reaction conditions [95][96][97][98][99][100][101] on the performance.…”

Section: Approaches Of Kinetic Analysis For Ftsmentioning

confidence: 99%

Recent Progresses in Understanding of Co-Based Fischer–Tropsch Catalysis by Means of Transient Kinetic Studies and Theoretical Analysis

Yang

Chen

et al. 2014

Catal Lett

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During the last years it has been an increasing focus on fundamental studies of the Fischer-Tropsch synthesis (FTS). Steady-state isotopic transient kinetic analysis and first principles investigation have proven to be important methods in studying the reaction mechanism of FTS. The present contribution deals with recent progresses in understanding of the F-T mechanism on Co catalysts based on combined DFT calculations, in situ characterization, steady-state isotopic transient kinetic analysis and microkinetics. A brief outlook into future perspectives of the FTS for converting synthesis gas from different carbon sources to fuels and chemicals is also provided.

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“…Furthermore, they observed positive correlations between the cobalt particle size and the C 5+ selectivity and between the catalyst pore size and the C 5+ selectivity, with small variations in the cobalt site-time yields related to the chemical purity of the catalyst samples. Low-surface-area alumina (α-Al 2 O 3 ) was found to display better C 5+ selectivity compared with high-surface-area alumina (γ-Al 2 O 3 ). , A macroporous-structured (MPS) Al 2 O 3 support synthesized from Al 2 O 3 nanoparticles using polystyrene beads as a sacrificial agent seemed to combine the advantages of α-Al 2 O 3 and γ-Al 2 O 3 as support materials, with activity and selectivity comparable to those of Co/γ-Al 2 O 3 and Co/α-Al 2 O 3 , respectively . Vosoughi et al demonstrated the synthesis of mesoporous alumina using Pluronic F127 as a structure-directing agent that contributed to a high surface area and large pore volume and pore diameter of the support.…”

Section: Alumina-supported Catalystsmentioning

confidence: 98%

“…Low-surface-area alumina (α-Al 2 O 3 ) was found to display better C 5+ selectivity compared with highsurface-area alumina (γ-Al 2 O 3 ). 36,37 38 Vosoughi et al 39 demonstrated the synthesis of mesoporous alumina using Pluronic F127 as a structure-directing agent that contributed to a high surface area and large pore volume and pore diameter of the support. The structure of the thus-prepared support collapsed upon impregnation with aqueous cobalt nitrate solution, but shifting the impregnation medium from aqueous to organic (ethanol or acetone) reinstated the textural stability of the mesoporous alumina.…”

Section: Alumina-supported Catalystsmentioning

confidence: 99%

“…36,37 A macroporous-structured (MPS) Al 2 O 3 support synthesized from Al 2 O 3 nanoparticles using polystyrene beads as a sacrificial agent seemed to combine the advantages of α-Al 2 O 3 and γ-Al 2 O 3 as support materials, with activity and selectivity comparable to those of Co/γ-Al 2 O 3 and Co/α-Al 2 O 3 , respectively. 38 Vosoughi et al 39 demonstrated the synthesis of mesoporous alumina using Pluronic F127 as a structure-directing agent that contributed to a high surface area and large pore volume and pore diameter of the support. The structure of the thus-prepared support collapsed upon impregnation with aqueous cobalt nitrate solution, but shifting the impregnation medium from aqueous to organic (ethanol or acetone) reinstated the textural stability of the mesoporous alumina.…”

Section: Introductionmentioning

confidence: 99%

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Effect of the Support and Its Surface Modifications in Cobalt-Based Fischer–Tropsch Synthesis

Munirathinam

Minh

Nzihou

2018

Ind. Eng. Chem. Res.

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Support effects in heterogeneous catalysis are evolving as an important field of investigation to optimize catalyst properties. The cobalt-based Fischer−Tropsch (FT) catalysts usually consist of metallic cobalt nanocrystallites dispersed on a support material. The present review surveys the progress that has been made over the last couple of decades in the area of the effect of the support and its surface modifications in cobalt-based FT synthesis. Different catalyst supports such as alumina, silica, titania, niobia, zirconia, zeolite, ceria, carbon-based materials, silicon carbide, aluminum phosphate, hydrotalcite, metal−organic frameworks, and metal foams are discussed and compared with classical supports like alumina or silica wherever permitted. Properties such as metal−support interactions, the support-induced size and morphology of the cobalt nanocrystallites (textural properties of the support), changes in the electronic properties of the cobalt clusters, and the acid/base nature of the support are examined, and wherever possible the activity and/or selectivity in FT synthesis is discussed. This review also summarizes findings on new and promising supports for FT catalysts. Guidance for support modifications and choice of the support as functions of the product selectivity in the FT process is also proposed. Figure 1. Effect of Zr loading and pore size on (a) CO rate, (b) CH 4 selectivity, and (c) C 5+ selectivity. Reaction conditions: 220°C, 22 bar, H 2 / CO = 2.1, X CO = 49−51%. Adapted with permission from ref 49.

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Studies of Macroporous Structured Alumina Based Cobalt Catalysts for Fischer–Tropsch Synthesis

Cited by 12 publications

References 23 publications

Recent Approaches in Mechanistic and Kinetic Studies of Catalytic Reactions Using SSITKA Technique

Recent Approaches in Mechanistic and Kinetic Studies of Catalytic Reactions Using SSITKA Technique

Recent Progresses in Understanding of Co-Based Fischer–Tropsch Catalysis by Means of Transient Kinetic Studies and Theoretical Analysis

Effect of the Support and Its Surface Modifications in Cobalt-Based Fischer–Tropsch Synthesis

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