Hierarchical zeolite Y as hosts for encapsulation of Fe-Schiff base complexes

Zhao, Yanpeng; Lv, Wenmiao; Lu, Ningyue; Shi, Xiufeng; Fan, Bin; Li, Ruifeng

doi:10.1016/j.micromeso.2017.08.021

Cited by 10 publications

(4 citation statements)

References 32 publications

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“…176 In addition to metals, metal oxides and salts, hierarchical zeolites have been used as supports for other catalysts: encapsulation of Fe-Schiff bases and Ti-salen complexes, incorporation of heteropolyacids and enzymes, and functionalization by grafting of sulfonic groups. [177][178][179][180][181]…”

Section: Properties Of Hierarchical Zeolitesmentioning

confidence: 99%

From 3D to 2D zeolite catalytic materials

et al. 2018

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Research activities and recent developments in the area of three-dimensional zeolites and their two-dimensional analogues are reviewed. Zeolites are the most important industrial heterogeneous catalysts with numerous applications. However, they suffer from limited pore sizes not allowing penetration of sterically demanding molecules to their channel systems and to active sites. We briefly highlight here the synthesis, properties and catalytic potential of three-dimensional zeolites followed by a discussion of hierarchical zeolites combining micro- and mesoporosity. The final part is devoted to two-dimensional analogues developed recently. Novel bottom-up and top-down synthetic approaches for two-dimensional zeolites, their properties, and catalytic performances are thoroughly discussed in this review.

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Section: Properties Of Hierarchical Zeolitesmentioning

confidence: 99%

From 3D to 2D zeolite catalytic materials

et al. 2018

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“…After that, the solid was heated to 300 °C and held for 4 h under a dry air atmosphere to remove the remaining carbon fouling. Finally, reduction was carried out in a flowing 10% H 2 /N 2 at 340 °C for 4 h. Other template removal methods were applied, such as calcination at 500 °C under an air flow, Soxhlet extraction (as-synthesized sample was treated at 80 °C for 48 h in 0.1 mol L –1 HCl/EtOH through Soxhlet extraction), microwave digestion (as-synthesized sample was dispersed in a mixture of hydrogen peroxide (H 2 O 2 , 30 wt %) and nitric acid (1:4 v/v) and then digested by microwaves using a gyrotron output power of 800 W at 80 °C for 20 min), and low-temperature calcination under an O 2 flow . Pt-free-analogue Si-ZSM-22 was synthesized similarly in the absence of a Pt precursor, with the template removal via calcination at 550 °C.…”

Section: Methodsmentioning

confidence: 99%

In Situ Encapsulation of Pt Nanoparticles within Pure Silica TON Zeolites for Space-Confined Selective Hydrogenation

Tang

Liu

et al. 2020

ACS Appl. Mater. Interfaces

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Straightforward encapsulation of Pt clusters (∼2 nm) into the pure silica TON-type zeolite (ZSM-22) was reached in a dry gel conversion route, where the ionic liquid template was removed via the hydrocracking-calcination-reduction approach. The obtained Pt@ZSM-22 series possessed high crystallinity, large surface area, and ultrafine Pt clusters inside the zeolite crystals. They exhibited remarkable activity in the semi-hydrogenation of phenylacetylene into styrene; the lead sample with 0.2 wt % Pt loading afforded a large turnover number up to 117,787. The preferential high affinity of the pure silica ZSM-22-encapsulated Pt clusters toward the substrate phenylacetylene rather than the hydrogenated product was derived from the unique space-confinement effect of zeolite microchannels, which is responsible for such excellent performance.

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“…The crystallization products obtained after 4 hours matched the characteristic diffraction peaks at 2θ of 5.75 , 10.8 , 12.7 , 15.9 , 18.8 , 23.4 , and 26.7 , which were earlier reported by Belaabed et al, [96] suggesting successful synthesis of zeolite Y with good crystallinity. [97] The diffraction peaks at 2θ of 21.1 correspond to cristobalite and 2θ of 29.4 , 30.6 , and 32.6 correspond to quartz, which is also incorporated in the zeolitic material.…”

Section: Characterization Synthesis Of Zeolite Ymentioning

confidence: 99%

Hydrothermal synthesis of zeolite Y from green materials

et al. 2021

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Several probes have been conducted by the scientific community to reduce emissions of greenhouse gases such as carbon dioxide (CO 2 ). A zeolitic material is capable of CO 2 adsorption with the aid of such technologies. Our present work is to efficiently synthesize zeolite Y with four Si/Al ratios (2.0, 2.5, 3.0, and 3.5) from green materials such as rice husk ash (source of Si) and metakaolin (source of Al). The method for preparing zeolite Y involves hydrothermal synthesis in a hydrodynamic reactor at 120 C temperature, for a reaction time of 24 hours. These synthetic zeolites represent high values for surface area as well as pore volume in micropore range and are compatible with the size of CO 2 molecules. The zeolite Y (with Si/Al ratio 3.5) has an absorption capacity of 3.35 mmol CO 2 /g at (900 kPa) pressure, thereby

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Hierarchical zeolite Y as hosts for encapsulation of Fe-Schiff base complexes

Cited by 10 publications

References 32 publications

From 3D to 2D zeolite catalytic materials

From 3D to 2D zeolite catalytic materials

In Situ Encapsulation of Pt Nanoparticles within Pure Silica TON Zeolites for Space-Confined Selective Hydrogenation

Hydrothermal synthesis of zeolite Y from green materials

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