Zeolite Y microspheres with perpendicular mesochannels and metal@Y heterostructures for catalytic and SERS applications

Chen, Zhuwen; Chen, Chao; Zhang, Jian; Zheng, Guangchao; Wang, Yanding; Dong, Lei; Qian, Wei; Hong, Mei

doi:10.1039/c7ta10444h

Cited by 36 publications

(32 citation statements)

References 47 publications

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“…This is then followed by local perfection driven by thermodynamics towards equilibrium. For example, the amino acid dissociates from the weak point inside the aluminosilicate through coordinated construction actions, and gradually generates internal interconnected mesopores while maintaining the external structure of the zeolite, increasing crystallinity and mechanical strength . Usually, creation of internal void and building zeolite crystallinity are contradictory processes.…”

Section: Omega On the Crystallization Pathwaymentioning

confidence: 99%

“…Dual modulation with separate organic small molecules has been achieved. Using water soluble mono‐alcohols as zeolite growth modifiers, together with L‐carnitine to fine tune the internal architecture, uniform zeolite Y microspheres with perpendicular mesochannels could be synthesized after simple treatment, illustrating the power of the multiple function groups in small molecules . Further incorporation of the small molecule functions in a single molecular structure are expected to be of greater scientific significance.…”

Section: Prospects For Future Researchmentioning

confidence: 99%

“…For example, the amino acid dissociates from the weak point inside the aluminosilicate through coordinated construction actions, and gradually generates internal interconnected mesopores while maintaining the external structure of the zeolite, increasing crystallinity [30c] and mechanical strength. [52] Usually, creation of internal void and building zeolite crystallinity are contradictory processes. But during the amino-acid-mediated process, this trade-off is perfectly reconciled probably owing to the synchronous and spatially resolved dissociation-association process of the zeolite framework.…”

Section: Omega On the Crystallization Pathwaymentioning

confidence: 99%

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Organic Mesopore Generating Agents (OMeGAs) for Hierarchical Zeolites: Combining Functions on Multiple Scales

2019

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In the synthesis of porous zeolites, small organic molecules usually function as organic structure‐directing agents (OSDAs) or zeolite growth modifiers (ZGMs), while mesoporous zeolites are typically synthesized by employing the physical space‐filling strategy with mesoscale templates including carbons, surfactants, and polymers. Recently, we discovered that a class of small organic molecules including the common amino acids could mediate the formation of zeolite mesopores based on a chemical bond‐breaking mechanism. This class of organic mesopore generating agents (OMeGAs) are distinguished by their ability to form organic anions in situ. In this minireview, we briefly introduce the widely recognized role of OSDA and ZGM, and then focus on the interesting function of OMeGA for the intracrystalline void generation. Comparison of OMeGA with the mesoscale templates especially surfactants are made in terms of their mesopore‐forming mechanisms, and the potential implications on a possible dissociative‐associative crystallization pathway are discussed. We end this review with the prospects of future research on the small molecule OMeGA, such as function integration and structure optimization.

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Section: Omega On the Crystallization Pathwaymentioning

confidence: 99%

Section: Prospects For Future Researchmentioning

confidence: 99%

Section: Omega On the Crystallization Pathwaymentioning

confidence: 99%

See 1 more Smart Citation

Organic Mesopore Generating Agents (OMeGAs) for Hierarchical Zeolites: Combining Functions on Multiple Scales

2019

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“…As for mesoporous zeolite supports, it is more easy to immobilize metal NPs owing to the presence of the larger mesopores. So far, many kinds of metal NPs (Pt, Pd, Ru, Ag, and the corresponded alloys) has been immobilized in mesoporous zeolites with different framework topologies based on this wetness impregnation method (Wang et al, 2015 , 2018a ; Mendes et al, 2017 ; Chen et al, 2018 ; Zhang et al, 2018 ). Due to the intrinsically structural advantages of mesoporous zeolites and confinement effects for the immobilized metal NPs, all of these reported composite catalysts had exhibited superior catalytic activity in various catalytic reactions (Liu and Corma, 2018 ).…”

Section: Encapsulation Strategies For Metal Npsmentioning

confidence: 99%

Encapsulation of Metal Nanoparticle Catalysts Within Mesoporous Zeolites and Their Enhanced Catalytic Performances: A Review

Liu

2018

Front. Chem.

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Metal nanoparticles (NPs) exhibit desired activities in various catalytic reactions. However, the aggregation and sintering of metal NPs usually cause the loss of catalytic performance in practical reaction processes. Encapsulation of catalytically active metal NPs on/within a high-surface-area inorganic support partially resolve such concerns. Microporous zeolites, owing to their rigid frameworks and porous structural features, have been considered as one of ideal inorganic supports. Metal NPs can be easily encapsulated and stabilized within zeolitic frameworks to prevent unwished aggregation during the catalysis. Unfortunately, sole microporous nanochannels (generally <1 nm) in conventional zeolites are not easy to be accessed. The introduction of another set of nanochannel (e.g., mesopore), known as mesoporous zeolites, can greatly improve the mass-transfer efficiency, which is structurally beneficial for most catalytic reactions. The coexistence of micropores and mesopores in inorganic supports provides the synergetic advantages of both fine confinement effect for metal NPs and easy diffusion for organic reactants/intermediates/products. This review focuses on the recent advances in the design and synthesis of mesoporous zeolites-encapsulated metal NP catalysts as well as their desired catalytic performances (activity and stability) in organic reactions. We first discuss the advantages of mesoporous zeolites as the supports and present general strategies for the construction of mesoporous zeolites. Then, the preparation methods on how to encapsulate NP catalysts within both microporous and mesoporous zeolites are clearly demonstrated. Third, some recent important cases on catalytic applications are presented to verify structural advantages of mesoporous zeolite supports. Within the conclusion, the perspectives on future developments in metal NP catalysts encapsulated within mesoporous zeolites are lastly discussed.

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“…This method, which converts hostindicator complexes into optical sensors, has recently attracted widespread attention in terms of its simplicity, sensitivity and selectivity. [11][12][13][14][15][16][17] In recent years, the development of fluorescent probes for analytes based on cucurbituril-guest inclusion complexes has attracted wide interest among researchers due to their excellent luminescent efficiency and selectivity. [18][19][20][21][22][23] In some cases, Q [8] in a large cavity can simultaneously bind two guests into their rigid cavities to form stable 1:2 host-guest complexes.…”

Section: Introductionmentioning

confidence: 99%

Host‐Guest Complexes of l‐Borneol with Cucurbituril and Cyclodextrin and Its Potential Use in Analysis of Drugs

Tang

Wang

et al. 2019

ChemistrySelect

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Host–guest inclusion of l‐borneol with cucurbit[7]uril, cucurbit[8]uril, β‐cyclodextrin and HP‐β‐cyclodextrin in aqueous solution was investigated by Isothermal titration calorimetry and 1H NMR spectroscopy. Furthermore, a supramolecular fluorescent probe between cucurbit[8]uril (Q[8]) and Proflavine (PF) (designated 2PF@Q[8]) showed a remarkable fluorescence enhancement to l‐borneol. The 2PF@Q[8] fluorescent probe can be used to detect l‐borneol with a detection limit of ∼10−8 mol/L. A good linear relationship of emission intensity at 514 nm for l‐borneol at concentrations of 0.1–3.0 μmol/L was observed. The proposed sensing mechanism was investigated using 1H NMR spectroscopy and ITC. Fluorescent cell imaging of prostate cancer (PC3) cells showed the that the 2PF@Q[8] fluorescent probe could be used to image l‐borneol in living cells.

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Zeolite Y microspheres with perpendicular mesochannels and metal@Y heterostructures for catalytic and SERS applications

Abstract: Zeolite Y microspheres with perpendicular mesochannels are prepared by using mono-alcohols as growth modifiers and carnitine for internal architecture modulation.

Cited by 36 publications

References 47 publications

Organic Mesopore Generating Agents (OMeGAs) for Hierarchical Zeolites: Combining Functions on Multiple Scales

Organic Mesopore Generating Agents (OMeGAs) for Hierarchical Zeolites: Combining Functions on Multiple Scales

Encapsulation of Metal Nanoparticle Catalysts Within Mesoporous Zeolites and Their Enhanced Catalytic Performances: A Review

Host‐Guest Complexes of l‐Borneol with Cucurbituril and Cyclodextrin and Its Potential Use in Analysis of Drugs

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