FISCHER-TROPSCH SYNTHESIS IN SLURRY-PHASE REACTORS USING Co/SBA-15 CATALYSTS

Rodrigues, J. J.; Lima, L. A.; Lima, Wellington Siqueira; Rodrigues, Meiry Gláucia Freire; Fernandes, Fabiano Ándré Narciso

doi:10.5419/bjpg2011-0015

Cited by 12 publications

(12 citation statements)

References 22 publications

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“…The diffractogram showed that the impregnation of the support with cobalt nitrate and its transformation into cobalt oxides slightly changed the support structure. This result agreed with the characteristics reported by several authors for other oxides supported by SBA-15 [25][26][27].…”

Section: Chemical Composition and Textural Properties Of The Support ...supporting

confidence: 93%

Fischer-Tropsch Synthesis on Co/SBA-15 Catalyst: Characterization and Oligomerization Modeling

Menezes¹,

Paula²,

Lima³

et al. 2022

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In this study, we investigated the oligomerization mechanism of the Fischer-Tropsch synthesis catalyzed by a cobalt-based catalyst supported by SBA-15. The Co/SBA-15 catalyst contained 20% w/w of cobalt. It was prepared by the wet impregnation method and characterized by X-ray diffraction (XRD), N2 adsorption-desorption, temperature-programmed reduction (TPR), and scanning electron microscopy coupled to X-ray energy dispersion spectroscopy (SEM-EDS). The FT synthesis was conducted in a slurry bed reactor operating at 240–270°C, 2.0–3.0 MPa, and 1:1–2:1 H2:CO ratio (mol:mol). An oligomerization model, based on alkyl and alkenyl mechanisms for hydrocarbon chain propagation, was used for product distribution. Impregnation with cobalt and calcination did not alter the structure of SBA-15. Cobalt oxides, including Co2O3 and Co3O4, were the active phases of the reaction. Adding cobalt to the support lowered the specific surface area and the pore volume of the support but did not change the structure of SBA-15. Fischer-Tropsch synthesis and C5+ hydrocarbon selectivity increased at a low H2:CO ratio (1.0) and low temperatures (240–255°C). The content of branched-chain paraffin and olefins increased with a decrease in the H2:CO ratio and temperature. The parameters of the model were estimated, and the assumption of a dual mechanism was satisfied.

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Section: Chemical Composition and Textural Properties Of The Support ...supporting

confidence: 93%

Fischer-Tropsch Synthesis on Co/SBA-15 Catalyst: Characterization and Oligomerization Modeling

Menezes¹,

Paula²,

Lima³

et al. 2022

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“…This study is part of a line of research developed at the Laboratory for the Development of New Materials-LABNOV at UFCG. This line of research covered a series of studies on the synthesis and characterization of molecular sieves through different processes [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35]. This study aims to reuse the mother liquor in three subsequent syntheses of the SBA-15 and MCM-41 molecular sieves to assess any possible changes in the physical, chemical, and morphological properties of each material.…”

Section: Introductionmentioning

confidence: 99%

Green Synthesis for MCM-41 and SBA-15 Silica Using the Waste Mother Liquor

Barbosa

Barros

Barbosa

et al. 2021

Silicon

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The synthesis of mesoporous materials such as MCM-41 and SBA-15 requires large amounts of water to neutralize the resulting products. The ltrate (mother liquor) therefore contains unreacted components that can be recycled and reused. The addition of the mother liquor in consecutive syntheses was carried out in order to evaluate the different effects on the physical and chemical properties of the mesoporous materials. For this purpose, the mother liquor from the initial synthesis (1st Generation) was saved and used for the second synthesis (2nd Generation) and successively for the third synthesis (3rd Generation).The three generations of each material were then characterized using different techniques such as X-ray diffraction, X-ray dispersive energy uorescence, electron microscopy, infrared spectroscopy, Thermal behavior by thermogravimetric analysis and N 2 adsorption. The materials obtained showed similar diffractograms for the three generations and also showed similar percentages of silica through XRF. The SEM and IR results for molecular sieves showed the effectiveness of the processes of MCM-41 and SBA-15 synthesis using mother liquor. The results made it possible to observe that the structures of the materials had no signi cant differences in their physical and chemical properties, favoring the use of mother liquor for up to three generations.

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“…intensidade do pico característico da SBA-15 diminuiu de intensidade (RODRIGUES, 2011;LIMA et al, 2010;ZHAO & WAN, 1998).…”

Section: Resultsunclassified

Síntese E Caracterização Da Peneira Molecular Sba-15: Influência Da Temperatura

Paula¹,

Lima²,

Rodrigues³

2015

Anais Do XX Congresso Brasileiro De Engenharia Química

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RESUMO -Esse trabalho teve como objetivo sintetizar a peneira molecular SBA-15 sob diferentes temperaturas de síntese visando a obtenção de um material com melhores propriedades texturais. A peneira molecular foi sintetizada com tetraetil ortosilicato (TEOS) como fonte de sílica e o copolímero tribloco, poli-(oxido etileno)-poli-(oxido propileno)-poli-(oxido etileno) PEO-PPO-PEO como agente direcionador de estrutura, sob temperatura de 35 ºC ou 60 ºC e agitação durante 24 horas. O material obtido, de pH próximo a 1, foi submetido a tratamento hidrotérmico a 100 ºC, em autoclave, durante 48 horas. O produto da síntese foi caracterizado por Difração de Raios-X (DRX) e Adsorção Física de N 2 (BET). As análises de DRX mostraram que as sínteses foram obtidas com sucesso e a partir dos resultados do BET evidenciaram-se melhores propriedades texturais da síntese realizada a 35 ºC. INTRODUÇÃOA peneira molecular SBA-15 é uma classe de silicato mesoporoso, caracterizada pelos poros tubulares uniformes e arranjo de canais ordenados hexagonalmente, estabilidade térmica mais elevada em comparação com M41S, elevado grau de ordenação estrutural, com área superficial elevada de 500-1000 m 2 /g (MEYNEN et al., 2009;ZHAO & WAN, 1998).A síntese da peneira molecular SBA-15 é, geralmente, realizada usando o tetraetilortosilicato (TEOS) como fonte de sílica e o copolímero tribloco, poli-(oxido etileno)-poli-(oxido propileno)-poli-(oxido etileno) PEO-PPO-PEO como agente direcionador, dissolvidos em meio ácido sob agitação e aquecimento (ZHAO & WAN, 1998). A síntese clássica da SBA-15 é realizada utilizando uma etapa de envelhecimento térmico seguida de um tratamento hidrotérmico.Os parâmetros de síntese são extremamente importantes e podem ser divididos em dois grupos. Primeiro, fatores químicos que correspondem a reagentes, aditivos e solventes. Segundo, fatores físicos que correspondem a condições experimentais externas, tais como temperatura, agitação e duração das etapas. Dentre estes parâmetros, pode-se destacar a temperatura de síntese que desempenha um papel importante durante a formação da estrutura da peneira molecular SBA-15. As velocidades de hidrólise e condensação serão influenciadas como também o mecanismo e interação entre o surfactante (agente direcionador pluronic) e os precursores.

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FISCHER-TROPSCH SYNTHESIS IN SLURRY-PHASE REACTORS USING Co/SBA-15 CATALYSTS

Cited by 12 publications

References 22 publications

Fischer-Tropsch Synthesis on Co/SBA-15 Catalyst: Characterization and Oligomerization Modeling

Fischer-Tropsch Synthesis on Co/SBA-15 Catalyst: Characterization and Oligomerization Modeling

Green Synthesis for MCM-41 and SBA-15 Silica Using the Waste Mother Liquor

Síntese E Caracterização Da Peneira Molecular Sba-15: Influência Da Temperatura

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