Synthesis and characterization of mesoporous alumina with large pore size and their performance in Fischer–Tropsch synthesis

Catalysts based on functionalised carbon nanofibers (FCNF) coated with Ni-decorated MoS 2 nanosheets were obtained by direct decomposition of ammonium thiomolybdate and nickel nitrate impregnated on the FCNF under controlled temperature conditions in inert atmosphere. The catalysts were characterised by X-ray Diffraction (XRD), N 2 adsorption, Raman spectroscopy, temperature programmed reduction of sulfur species (TPR-S), NH 3 temperature programmed desorption (NH 3 -TPD) and transmission electron microscopy (TEM). Decomposition temperature was found to have a paramount importance in the formation of uniform MoS 2 slabs, as revealed by the TEM study: at 600 °C, non-uniform covering of the carbon nanofiber (CNF) was observed Higher asphaltene conversions were obtained for the CNF-supported catalysts prepared at 450 °C, which overperformed the Al 2 O 3 -supported benchmark catalyst. However, the catalytic performance in hydrodesulfurisation and hydrodemetallisation of the CNFbased catalysts was slightly lower than that of the benchmark catalyst.

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“…An alumina support with large surface area and pore volume was synthesized according to a procedure [23] modified from the literature [24].…”

Section: B) Mesoporous Alumina Synthesismentioning

confidence: 99%

Carbon nanofibres coated with Ni decorated MoS2 nanosheets as catalyst for vacuum residue hydroprocessing

Pinilla

Purón

Torres

et al. 2014

Applied Catalysis B: Environmental

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“…It has been found that, OMMs allow higher metal dispersion and prevent Co from sintering [21]. Recently, Lesaint et al [22,23] published the synthesis of ordered mesoporous alumina using different surfactant templates. In accordance with other authors formerly cited, they showed that wide pores favor higher S C5?…”

Section: Introductionmentioning

confidence: 99%

On the Way to a More Open Porous Network of a Co–Re/Al2O3 Catalyst for Fischer–Tropsch Synthesis: Pore Size and Particle Size Effects on Its Performance

et al. 2015

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Five different c-alumina supports were used, one commercial and four prepared in a macro-mesoporosity range of 7-1000 nm by different preparation methods. A simple method was used to obtain a macromesoporous alumina support by modification of an initial commercial mesoporous alumina with a pore generating agent. Supports were used to prepare Fischer-Tropsch synthesis (FTS) catalysts. Supports and catalysts were characterized by several techniques and tested in a labscale fixed-bed reaction unit in the FTS at 493 K and 2 MPa, with small (\63 lm) and large (500-710 lm) catalyst particle size (PS). Catalytic results showed that with small catalyst PS, the behavior is similar among them. With large catalyst PS, C 5? selectivity considerably decreased and CH 4 selectivity increased for all catalysts due to diffusional restrictions. Nevertheless, the effect of diffusion limitations of reactants and products through catalyst pores were lower for catalysts with a higher mesoporosity (20-50 nm), and much lower for the catalyst obtained when the support was modified to add macroporosity between 100 and 1000 nm. These macropores improve the transport of reactants and heavy hydrocarbons produced between the gaseous phase and the active sites. As a consequence, a better performance of the catalyst is attained, reducing the non-desirable effects of a diffusionlimited regime.

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“…The reactions over modified mesoporous aluminas include transesterification of vegetable oils [39], Fischer-Tropsch synthesis [40,41] or hydrodesulfurization [42][43][44]. Further on, mesoporous molecular sieves are considered for synthesis of novel heterogeneous reusable catalysts and those exhibiting even chiral properties [19,45].…”

Section: Introductionmentioning

confidence: 99%

Recent Advances in Catalysis Over Mesoporous Molecular Sieves

2009

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This overview covers the recent achievements in the application of mesoporous molecular sieves as catalysts and catalyst supports. Main structural and textural features are outlined in relation to the novel synthesis approaches of mesoporous molecular sieves and understanding of their properties. For application of mesoporous molecular sieves as catalysts different ways of introduction of active sites on their surfaces are provided. The main part describes selected catalytic reactions catalyzed by mesoporous molecular sieves focused on very recent papers. The examples include metathesis, acylation reactions, C-C coupling reactions of Heck and Suzuki types, basecatalyzed reactions (Knoevenagel and Michael additions, Claisen-Schmidt condensation, Tischenko reaction) and last but not least immobilization of organometallic complexes for different catalytic applications including chiral catalysts.

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Synthesis and characterization of mesoporous alumina with large pore size and their performance in Fischer–Tropsch synthesis

Cited by 48 publications

References 29 publications

Carbon nanofibres coated with Ni decorated MoS2 nanosheets as catalyst for vacuum residue hydroprocessing

Carbon nanofibres coated with Ni decorated MoS2 nanosheets as catalyst for vacuum residue hydroprocessing

On the Way to a More Open Porous Network of a Co–Re/Al2O3 Catalyst for Fischer–Tropsch Synthesis: Pore Size and Particle Size Effects on Its Performance

Recent Advances in Catalysis Over Mesoporous Molecular Sieves

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