Mesoporous MEL, BEA, and FAU zeolite crystals obtained by in situ formation of carbon template over metal nanoparticles

Abildstrøm, Jacob Oskar; Ali, Zahra N.; Mentzel, Uffe Vie; Mielby, Jerrik Jørgen; Kegnæs, Søren; Kegnæs, Marina

doi:10.1039/c5nj02809d

Cited by 14 publications

(11 citation statements)

References 34 publications

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“…Indeed, there are many types of catalysts that have been used for the conversion of glucose to HMF, such as metal chloride salts (MgCl 2 , SnCl 4 ) [7], metal oxides (TiO 2 , ZrO 2 , Nb 2 O 5 ) [8,9], metal organic frameworks (ZIF-8) [10], zeolites [11][12][13][14][15][16], and Sn, Ti and Zr-containing zeolites [17,18]. Among them, the metal incorporated in a zeolite is one of the most important candidates for this reaction because of high metal dispersion [19], high surface area [20], unique shape selective properties [21], suitable acid properties [22] and high thermal/hydrothermal stability [23], for example.…”

Section: Introductionmentioning

confidence: 99%

In Situ Synthesis of Sn-Beta Zeolite Nanocrystals for Glucose to Hydroxymethylfurfural (HMF)

et al. 2020

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The Sn substituted Beta nanocrystals have been successfully synthesized by in-situ hydrothermal process with the aid of cyclic diquaternary ammonium (CDM) as the structure-directing agent (SDA). This catalyst exhibits a bifunctional catalytic capability for the conversion of glucose to hydroxymethylfurfural (HMF). The incorporated Sn acting as Lewis acid sites can catalyze the isomerization of glucose to fructose. Subsequently, the Brønsted acid function can convert fructose to HMF via dehydration. The effects of Sn amount, zeolite type, reaction time, reaction temperature, and solvent on the catalytic performances of glucose to HMF, were also investigated in the detail. Interestingly, the conversion of glucose and the HMF yield over 0.4 wt% Sn-Beta zeolite nanocrystals using dioxane/water as a solvent at 120 °C for 24 h are 98.4% and 42.0%, respectively. This example illustrates the benefit of the in-situ synthesized Sn-Beta zeolite nanocrystals in the potential application in the field of biomass conversion.

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Section: Introductionmentioning

confidence: 99%

In Situ Synthesis of Sn-Beta Zeolite Nanocrystals for Glucose to Hydroxymethylfurfural (HMF)

et al. 2020

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“…A hierarchical pore system facilitates mass transport while maintaining the zeolite shape selectivity [37]. Abildstrøm et al [38] indicated that the introduction of an even moderate degree of mesoporosity during the synthesis could improve the ability for the ion exchange of zeolite Y and thus lead to an improved and more stable ion exchange process at industrial scale.…”

Section: Resultsmentioning

confidence: 99%

Green synthesis of nanocrystalline faujasite zeolite

Reinoso

Adrover

Pedernera

2018

Ultrasonics Sonochemistry

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In this work, the synthesis of 28 and 38 nm Na-Y zeolite nanocrystals is reported. The process was performed via green synthesis without any organic structure directing agents (SDAs), at low temperature and applying ultrasound-assisted aging. The zeolite nanoparticles obtained were characterized by X ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and N adsorption - desorption isotherm at 77 K. A simple, fast, efficient and environmentally friendly procedure to synthetize nanocrystalline FAU zeolite is described in the present study. The sonochemical pretreatment was found to directly affect the Na-Y zeolite properties. The final product obtained via ultrasound pretreatment shows high phase purity and crystallinity degree with crystal size smaller than 38 nm and elevated surface area (S ∼ 950 m g). The hierarchical micro- and mesoporous FAU zeolites exhibit a pore volume of ∼0.4 cm g.

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“…X‐ray powder diffraction patterns were obtained for the three materials which is shown in Figure . The diffraction patterns of the three materials (Figure top) are consistent with a FAU structure for Pt@H−Y and a CHA structure for both Pt@K‐CHA and Pt/K−CHA ,. To evaluate the size of the Pt particles Figure bottom shows a zoomed part of the diffraction pattern.…”

Section: Resultsmentioning

confidence: 99%

Towards Encapsulation of Nanoparticles in Chabazite Through Interzeolite Transformation

2018

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Encapsulation of Pt nanoparticles (1-2 nm) in the small pore zeolite chabazite (CHA) was achieved by a seed-and structuredirecting agent-free interzeolite transformation from zeolite Y (FAU). Prior to the transformation, the Pt nanoparticles were encapsulated in the commercially available large pore zeolite HÀY by simple incipient wetness impregnation. The HÀY was then converted into CHA in a solution of KOH under hydrothermal conditions at 95 8C. All catalysts were characterized by XRD, N 2 -physisorption, H 2 -chemisorption, TEM and XPS and their catalytic activity were tested in CO oxidation. Although the catalytic activity of the encapsulated Pt nanoparticles decreased over time, it still remained more active than a reference catalyst prepared by impregnation. The thermal stability of the catalysts was investigated after calcination at 400 8C for 18 hours. Compared to the other catalysts, the encapsulated Pt nanoparticles only resulted in a small decrease in catalytic activity.

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Mesoporous MEL, BEA, and FAU zeolite crystals obtained by in situ formation of carbon template over metal nanoparticles

Cited by 14 publications

References 34 publications

In Situ Synthesis of Sn-Beta Zeolite Nanocrystals for Glucose to Hydroxymethylfurfural (HMF)

In Situ Synthesis of Sn-Beta Zeolite Nanocrystals for Glucose to Hydroxymethylfurfural (HMF)

Green synthesis of nanocrystalline faujasite zeolite

Towards Encapsulation of Nanoparticles in Chabazite Through Interzeolite Transformation

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