Hollow Alveolus-Like Nanovesicle Assembly with Metal-Encapsulated Hollow Zeolite Nanocrystals

Dai, Chengyi; Zhang, Anfeng; Liu, Min; Gu, Lin; Guo, Xinwen; Chen, Song

doi:10.1021/acsnano.6b00888

Cited by 100 publications

(52 citation statements)

References 87 publications

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“…By applying as both the anode and cathode, the catalyst required only an overall potential of 1.64 V to drive the current density of 10 mA cm −2 for the water splitting, and showed superior stability in the continuous 36 h test. Dai et al reported Fe 2 O 3 encapsulated hierarchical hollow ZSM‐5 nanospheres by the assembly of hollow alveolus‐like nanovesicles via a one‐pot hydrothermal method . Structural characterizations demonstrated that 3–4 nm Fe 2 O 3 NPs were homogeneously dispersed in the thermally stable (up to 800 °C) porous zeolite assembly with an ≈350 nm cavity, 5–17 nm mesoporous interparticle shell, and 0.4–0.6 nm microporous particle walls.…”

Section: Insight Into Hollow Nanomaterials As a Nanoreactor In Spatiamentioning

confidence: 99%

Functionalization of Hollow Nanomaterials for Catalytic Applications: Nanoreactor Construction

et al. 2018

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Hollow nanomaterials have attracted a broad interest in multidisciplinary research due to their unique structure and preeminent properties. Owing to the high specific surface area, well-defined active site, delimited void space, and tunable mass transfer rate, hollow nanostructures can serve as excellent catalysts, supports, and reactors for a variety of catalytic applications, including photocatalysis, electrocatalysis, heterogeneous catalysis, homogeneous catalysis, etc. Based on state-of-the-art synthetic methods and characterization techniques, researchers focus on the purposeful functionalization of hollow nanomaterials for catalytic mechanism studies and intricate catalytic reactions. Herein, an overview of current reports with respect to the catalysis of functionalized hollow nanomaterials is given, and they are classified into five types of versatile strategies with a top-down perspective, including textual and composition modification, encapsulation, multishelled construction, anchored single atomic site, and surface molecular engineering. In the detailed case studies, the design and construction of hierarchical hollow catalysts are discussed. Moreover, since hollow structure offers more than two types of spatial-delimited sites, complicated catalytic reactions are elaborated. In summary, functionalized hollow nanomaterials provide an ideal model for the rational design and development of efficient catalysts.

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Section: Insight Into Hollow Nanomaterials As a Nanoreactor In Spatiamentioning

confidence: 99%

Functionalization of Hollow Nanomaterials for Catalytic Applications: Nanoreactor Construction

et al. 2018

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“…55 ppm, attributed to the tetrahedrally coordinated framework Al species (FAL), while the resonances at ca. 0 ppm are very weak, which is usually assigned to the octahedrally coordinated extra‐framework Al species (EFAL) . These results demonstrate that almost all Al atoms in HSZs‐ 5 and HSZs‐ 48 are isomorphous substituted for Si atoms in Silicalite‐1 frameworks.…”

Section: Resultsmentioning

confidence: 84%

Mesoporogen‐Free Synthesis of High‐Silica Hierarchically Structured ZSM‐5 Zeolites and their Superior Performance for the Methanol‐to‐Propylene Reaction

Guo

et al. 2018

Eur J Inorg Chem

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A series of hierarchically structured ZSM‐5 zeolites (ZSM‐5 HSZs) with a Si/Al ratio of about 200 have been successfully synthesized in the absence of additional mesoporous agents. XRD, N2 sorption isotherms, SEM, TEM and NH3‐TPD results showed that the obtained HSZs materials possess high crystallinity, interconnected micro/mesoporous structures and similar total acid amounts. Meanwhile, in the methanol‐to‐propylene (MTP) reaction, compared to the microporous counterpart, all synthesized ZSM‐5 HSZs demonstrated superior performance benefitting from their hierarchical porous structures. Interestingly, 27Al MAS NMR and Py‐FTIR results confirmed the inter‐transformation of framework and extra‐framework Al species with the extension of materials crystallization duration and consequently the variation of materials surface acidity. As a result, the optimized catalyst achieved the highest initial propylene selectivity of 54.4 % and the longest catalyst lifetime (t90) of 175 h under the weight hourly space velocity (WHSV) of 1.0 g g–1 h–1. Moreover, a new “in situ alkali etching‐hydrothermal restoring“ mechanism has been proposed to elucidate the structural evolution of here reported high‐silica ZSM‐5 HSZs during the synthesis.

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“…The specific surface area and total pore volume including meso‐ and macropore volumes were decreased slightly after desilication, but increased markedly after dealumination, this indicated that dealuminization has a more significant effect for textural properties than desilication for the parent HZSM‐5. For HZSM‐5‐0.09 M‐1‐M, the change of specific surface area and pore volume was not obvious after surface‐passivation by liquid phase deposition, but increased obviously after hydrothermal treatment, this might be due to the silicate oligomers within catalyst crystal was dissolved in the process of hydrothermal treatment and then in the template agent on the crystal surface under the action of secondary crystallization, it could also be demonstrated in Figure , the relative crystallinity from 73 % of HZSM‐5‐0.09 M‐1‐M to 97 % of Si/HZSM‐5‐0.09 M‐1M T .…”

Section: Resultsmentioning

confidence: 93%

Effect of the Post‐Treatment of HZSM‐5 on Catalytic Performance for Methanol to Aromatics

Dong

et al. 2020

ChemistrySelect

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The preparation of aromatic by methanol was the most effective way for rational utilization of resources. However, the catalyst for MTA reaction has not yet been successfully studied. Therefore, highly active and shape‐selective HZSM‐5 zeolite‐based catalysts were designed and synthesized by post‐treatments of desilication, dealumination, surface‐passivation and hydrothermal treatment tuning pore structure and acid amount and acid concentration of catalysts. XRD, SEM, TEM, BET, NH3‐TPD and Py‐IR were used for research and analysis the structure‐activity relationship between the catalysts and MTA reaction. The results showed that the total acid amount of catalyst shown a significant role in increasing the BTX selectivity. The selectivity of aromatics increased from 33 % to 58.1 % after hydrothermal treatment compared to the parent HZSM‐5 zeolite due to the decreased of total acid amount. Nevertheless the weak acid sites were crucial in increasing the p‐xylene selectivity. The selectivity of p‐xylene reached 63.8 % and 70.1 % after hydrothermal treatment and surface‐passivation due to the increased of weak acid sites, respectively. Modified HZSM‐5 zeolite‐base catalysts showed good application prospects in producing aromatics from methanol.

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Hollow Alveolus-Like Nanovesicle Assembly with Metal-Encapsulated Hollow Zeolite Nanocrystals

Cited by 100 publications

References 87 publications

Functionalization of Hollow Nanomaterials for Catalytic Applications: Nanoreactor Construction

Functionalization of Hollow Nanomaterials for Catalytic Applications: Nanoreactor Construction

Mesoporogen‐Free Synthesis of High‐Silica Hierarchically Structured ZSM‐5 Zeolites and their Superior Performance for the Methanol‐to‐Propylene Reaction

Effect of the Post‐Treatment of HZSM‐5 on Catalytic Performance for Methanol to Aromatics

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