Seed‐Assisted, One‐Pot Synthesis of Hollow Zeolite Beta without Using Organic Structure‐Directing Agents

Iyoki, Kenta; Itabashi, Keiji; Okubo, Tatsuya

doi:10.1002/asia.201300365

Cited by 41 publications

(40 citation statements)

References 37 publications

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“…The “hollowing” zeolite process has been widely reported for zeolites with MFI framework type, leading to nanoboxes with regular zeolitic walls whose thickness can be controlled down to a few nanometers . More recently, we succeeded in preparing hollow Beta and Y zeolite crystals, with *BEA and FAU framework types, respectively …”

Section: Methodsmentioning

confidence: 99%

Demonstration of Improved Effectiveness Factor of Catalysts Based on Hollow Single Crystal Zeolites

et al. 2018

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Pt/NaY zeolites with bulk and hollow morphologies have been used as model catalysts in the hydrogenation of cyclohexene as model reaction. In contrast to most hierarchical zeolites, the presence of a single internal cavity modifies only the mean diffusion length, without changing the external surface area and the crystal size. Differences in catalytic activities have been attributed to a shorter diffusion length in hollow crystals. The volume fraction of zeolite used in bulk crystals (ca. 0.63–0.70) matches well with the shell thickness in hollow crystals, leading to an efficiency factor value for the latter close to 1.

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Section: Methodsmentioning

confidence: 99%

Demonstration of Improved Effectiveness Factor of Catalysts Based on Hollow Single Crystal Zeolites

et al. 2018

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“…However,am ajor drawback is that the use of OSDAs makes commercialization of zeolites extremely expensive and additionally requires complex processing stages, which strictly limits the industrial use of OSDA-directed zeolites. [8][9][10] Furthermore, severalz eolitest hat required the use of an OSDA, such as RUB-13, [11] ZSM-12, [12][13][14] ZSM-11, [10] ECR-18, [10] ZK-20, [15] hollow-beta, [16] omega, [17] MCM-68, [18] VPI-8, [19] ZSM-22 [20] and NU-87, [21] were successfully synthesized by the seed-assisted method without the use of any OSDAs. For instance, the conventionals ynthesis of zeoliteb etarequired the use of OSDA until Xie et al [7] reported the first OSDA-free synthesis in which zeolite betas eeds were added to an aluminosilicate reactantg el in the absence of OSDA.…”

Section: Introductionmentioning

confidence: 99%

Seed‐Assisted Synthesis of MWW‐Type Zeolite with Organic Structure‐Directing Agent‐Free Na‐Aluminosilicate Gel System

Kamimura

Itabashi

Kon

et al. 2017

Chemistry An Asian Journal

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The seed-assisted synthesis of zeolites without using organic structure-directing agents (OSDAs) has enabled alternative routes to the simple, environmentally friendly and low-cost production of industrially important zeolites. In this study, the successful seed-assisted synthesis of MCM-22 (MWW-type) zeolite with an OSDA-free gel is reported for the first time. MWW-type zeolites are obtained by the addition of as-synthesized MCM-22 seeds prepared with hexamethyleneimine (HMI) into OSDA-free Na-aluminosilicate gels. Based on the results of XRD, ICP-AES, NMR, N physisorption and NH -TPD, the product exhibited different features compared to those of the seeds. The H-form product can serve as a catalyst in Friedel-Crafts alkylation reaction of anisole with 1-phenylethanol, and its catalytic activity is comparable to the seeds. Furthermore, XRD, FE-SEM, TG-DTA, CHN, FT-IR and NMR analyses of products and intermediates provide insights into the role of seeds and occluded HMI, the crystallization process, and key factors for achieving seed-assisted synthesis of MWW-type zeolites with an OSDA-free gel system. The present results provide a new perspective for the economical and environmentally friendly production of MWW-type zeolites.

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“…One important factor in the successful organic structure directing agent (OSDA)-free synthesis of hollow beta crystals is the solubility of the seed crystals in alkaline media. 63 CIT-6 was less stable than aluminosilicate zeolite beta in alkaline media and the solubility changed depending on whether the crystals were calcined or not. Figure 6 shows the TEM image of the sliced crystal.…”

Section: Template-free Strategymentioning

confidence: 97%

“…The crystal growth proceeded from the outside inward after the complete dissolution of the CIT-6 seed crystal. 63 …”

Section: Template-free Strategymentioning

confidence: 97%

Synthesis and Catalytic Application of Zeolite-Based Hollow Materials

Li¹,

Zhang²,

Fang³

et al. 2014

energy environ focus

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Owing to the diffusion limitations of reactants and products in micropores, large zeolite crystals are not suitable for catalytic reactions involving macromolecules. Hierarchically porous zeolites with mesopores or macropores exhibit remarkably improved catalytic performance. Moreover, zeolite-based hollow structures are attracting a great deal of interest for their diverse applications in the areas of biochemistry, photonics, and catalysis. This review presents the fabrication and catalytic applications of the various zeolite-based hollow materials. The synthesis methods are classified to three categories, and the formation mechanisms were briefly summarized in this paper.

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Seed‐Assisted, One‐Pot Synthesis of Hollow Zeolite Beta without Using Organic Structure‐Directing Agents

Cited by 41 publications

References 37 publications

Demonstration of Improved Effectiveness Factor of Catalysts Based on Hollow Single Crystal Zeolites

Demonstration of Improved Effectiveness Factor of Catalysts Based on Hollow Single Crystal Zeolites

Seed‐Assisted Synthesis of MWW‐Type Zeolite with Organic Structure‐Directing Agent‐Free Na‐Aluminosilicate Gel System

Synthesis and Catalytic Application of Zeolite-Based Hollow Materials

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