Effect of Silylation and Support Porosity of Co/MCM-41 and Co/SiO2 Catalysts in Fischer–Tropsch Synthesis

Zola, Andréia Soares; Silva, Lidiane Sabino da; Moretti, Artur Lemes; Fraga, Adriano do Couto; Sousa-Aguiar, Eduardo Falabella; Arroyo, Pedro Augusto

doi:10.1007/s11244-015-0446-1

Cited by 12 publications

(6 citation statements)

References 28 publications

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“…2115 A similar approach was reported with Co/SiO 2 Fischer−Tropsch catalysts. 2116 The silylation process is also useful to block the Brønsted acidity of the surface OH groups. 2117 Even Lewis-acid sites may be poisoned by silylation.…”

Section: Silylation Sol-gel Site Imprintingmentioning

confidence: 99%

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Designing Sites in Heterogeneous Catalysis: Are We Reaching Selectivities Competitive With Those of Homogeneous Catalysts?

Zaera

2022

Chem. Rev.

167

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A critical review of different prominent nanotechnologies adapted to catalysis is provided, with focus on how they contribute to the improvement of selectivity in heterogeneous catalysis. Ways to modify catalytic sites range from the use of the reversible or irreversible adsorption of molecular modifiers to the immobilization or tethering of homogeneous catalysts and the development of well-defined catalytic sites on solid surfaces. The latter covers methods for the dispersion of single-atom sites within solid supports as well as the use of complex nanostructures, and it includes the post-modification of materials via processes such as silylation and atomic layer deposition. All these methodologies exhibit both advantages and limitations, but all offer new avenues for the design of catalysts for specific applications. Because of the high cost of most nanotechnologies and the fact that the resulting materials may exhibit limited thermal or chemical stability, they may be best aimed at improving the selective synthesis of high value-added chemicals, to be incorporated in organic synthesis schemes, but other applications are being explored as well to address problems in energy production, for instance, and to design greener chemical processes. The details of each of these approaches are discussed, and representative examples are provided. We conclude with some general remarks on the future of this field.

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Section: Silylation Sol-gel Site Imprintingmentioning

confidence: 99%

“…Methyl modification of a Fe 2 O 3 @SiO 2 catalyst was used to render the silica surface hydrophobic so to prevent the readsorption of water during CO hydrogenation, inhibiting the undesirable WGS side reaction that produces CO 2 (Figure ). A similar approach was reported with Co/SiO 2 Fischer–Tropsch catalysts …”

Section: Surface Modificationmentioning

confidence: 99%

Designing Sites in Heterogeneous Catalysis: Are We Reaching Selectivities Competitive With Those of Homogeneous Catalysts?

Zaera

2022

Chem. Rev.

167

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“…11 For FTS reaction, it is more effective to reduce the interaction between active phases and supports than to increase the number of active metal sites by loading a greater amount of metal. 12,13 Some works have been reported concerning SiO 2 -encapsulated core-shell catalysts. 3,14,15 Zhang et al prepared Fe@Si catalyst and showed that the stability of iron species against sintering was effectively improved by the SiO 2 shell.…”

Section: Introductionmentioning

confidence: 99%

Novel polyhedral@SiO₂ core–shell catalysts designed for Fischer–Tropsch synthesis

Zhang

Lin

2022

J of Chemical Tech & Biotech

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Background: Fischer-Tropsch synthesis (FTS) has attracted much attention for converting syngas to liquid fuels. Enhanced catalytic stability and excellent product selectivity can be achieved by rational design of catalysts. However, the traditional SiO 2 -supported Fe-based catalysts display higher interaction between active metal and SiO 2 support, thus resulting in a lower catalytic activity. Rational design of catalysts with weaker Fe-Si interaction promises excellent catalytic performances.Results: Novel polyhedral@SiO 2 core-shell catalysts with adjustable shell thickness were prepared. The incorporation of SiO 2 shell with suitable thickness can maintain the integrity of the active structure, and thus promising excellent C 5+ productivity combined with higher catalytic activity. On the other hand, the SiO 2 layer can prolong the residence time of C n H m intermediates on the active surface of Fe particles that enhance the C-C coupling reaction, favoring chain growth for production of C 5+ yield. However, excessive addition of tetraethyl orthosilicate cannot increase the shell thickness in the absence of ammonium hydroxide and can be responsible for a poor CO conversion. Si-66 with shell thickness of 66 nm achieves an optimum C 5+ yield of 2.23 × 10 −3 g HC g Fe −1 s −1 and a higher iron time yield value of 31.5 ∼mol CO g Fe −1 s −1 . Obviously, this C 5+ yield is comparable to that for the Mn-promoted FeSiMn catalyst (2.22 × 10 −3 g HC g Fe −1 s −1 ) reported in our previous work.Conclusions: The introduction of SiO 2 as shell can improve structural stability during FTS. Moreover, the novel polyhedral@SiO 2 core-shell catalyst exhibits excellent C 5+ yield, and which is 1.8 times higher than that for a spindle@SiO 2 core-shell catalyst reported in our previous work.

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“…We report here on the activity of silicon and aluminum oxides, and a new series of catalysts on the base of H 8…”

Section: Introductionmentioning

confidence: 99%

Processing of Methane over the Oxide Catalysts

Dossumov¹,

Yergaziyeva²,

Myltykbayeva³

et al. 2017

IJMMM

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Catalysis of the supported oxide catalysts in the direction of the methane oxidation reaction is investigated. Modified nickel-containing catalysts studied at the reaction of partial oxidation of methane to synthesis gas. The effect of modifying additives (cerium and lanthanum oxides) on the activity and resistance to coking NiO / γ -Al 2 O 3 catalyst was defined. The introduction of cerium and lanthanum oxides increases resistance to catalyst coking. Rising of lanthanum modified catalyst activity associated with a decrease in its recovery temperature and increased dispersion of particles of metallic nickel. It is found that the developed 3% NiO + 2% La 2 O 3 / ɣ-Al 2 O 3 catalyst for 250 hours under laboratory conditions (CH 4 : O 2 = 2: 1, T r = 750 o C and W = 1000 h -1 ) does not lose its activity. It was determined that the use of a tungsten heteropoly acid as the active phase supported on Al 2 O 3 can direct the process towards the formation of ethylene.

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Effect of Silylation and Support Porosity of Co/MCM-41 and Co/SiO2 Catalysts in Fischer–Tropsch Synthesis

Cited by 12 publications

References 28 publications

Designing Sites in Heterogeneous Catalysis: Are We Reaching Selectivities Competitive With Those of Homogeneous Catalysts?

Designing Sites in Heterogeneous Catalysis: Are We Reaching Selectivities Competitive With Those of Homogeneous Catalysts?

Novel polyhedral@SiO₂ core–shell catalysts designed for Fischer–Tropsch synthesis

Processing of Methane over the Oxide Catalysts

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Effect of Silylation and Support Porosity of Co/MCM-41 and Co/SiO2 Catalysts in Fischer–Tropsch Synthesis

Cited by 12 publications

References 28 publications

Designing Sites in Heterogeneous Catalysis: Are We Reaching Selectivities Competitive With Those of Homogeneous Catalysts?

Designing Sites in Heterogeneous Catalysis: Are We Reaching Selectivities Competitive With Those of Homogeneous Catalysts?

Novel polyhedral@SiO2 core–shell catalysts designed for Fischer–Tropsch synthesis

Processing of Methane over the Oxide Catalysts

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Product

Resources

About

Novel polyhedral@SiO₂ core–shell catalysts designed for Fischer–Tropsch synthesis