Generation of Mesoporosity in LTA Zeolites by Organosilane Surfactant for Rapid Molecular Transport in Catalytic Application

Cho, Kanghee; Cho, Hae Sung; Ménorval, Louis-Charles de; Ryoo, Ryong

doi:10.1021/cm902861y

Cited by 198 publications

(145 citation statements)

References 40 publications

(84 reference statements)

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“…Other mesoporous zeolites synthesized by the amphiphilic organosilane surfactants were LTA [122], and FAU [123]. On one hand, a detailed synthetic work was performed to control the mesoporosity in the hierarchical LTA zeolite [122].…”

Section: Direct Synthesis Of Hierarchical Zeolites By Dual Templatingmentioning

confidence: 99%

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Direct Synthesis of Functional Zeolitic Materials

Moliner

2012

ISRN Materials Science

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Recently, the direct synthesis of zeolitic materials has received much attention because several well-defined functionalities have been introduced in those materials by "one-pot" methodologies. The rationalization of the physics and chemistry of the processes involved in the zeolite growth has allowed the direct preparation of different functional molecular sieves with unique properties and potential applicability in industry. In the present paper, the "one-pot" preparations of metal-containing zeolites (both in framework and extra-framework positions), hybrid organic-inorganic molecular sieves, hierarchical microporous mesoporous zeotypes, nanosheets, nanozeolites, or template-free molecular sieves are intensively evaluated.

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Section: Direct Synthesis Of Hierarchical Zeolites By Dual Templatingmentioning

confidence: 99%

“…On one hand, a detailed synthetic work was performed to control the mesoporosity in the hierarchical LTA zeolite [122]. The mesopore size was tailored from 6 to 10 nm controlling the surfactant amount.…”

Section: Direct Synthesis Of Hierarchical Zeolites By Dual Templatingmentioning

confidence: 99%

Direct Synthesis of Functional Zeolitic Materials

Moliner

2012

ISRN Materials Science

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“…Therefore, a lot of strategies including top-down desilication by alkali treatment [9][10][11], and bottom-up directed by hard [12][13][14][15][16][17] and soft template [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34] have been proposed to synthesize meso-micro or macro-meso-micro zeolites. However, desilication is not suitable for the zeolite at low Si/Al molar ratio such as FAU, LTA, etc.…”

Section: Introductionmentioning

confidence: 99%

Additive-free synthesis of mesoporous FAU-type zeolite with intergrown structure

Jia

Han

et al. 2018

Sci. China Mater.

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Hierarchical porous zeolites attract great attention because of their porosity on different scales to improve molecular diffusion. Here, we report mesoporous Faujasite (FAU) zeolite nanosheets with intergrown structure synthesized in an additive-free system. The sample was composed of uniform nanosheets with a slice thickness of~50 nm, which held a honeycomb-like structure with abundant mesopores. This material exhibits both microporous and mesoporous structure: the intrinsic micropores with a diameter about 0.74 nm in the zeolite framework and the mesopores with a diameter about 10 nm existing within the zeolite nanosheets. The Si/Al ratios can be adjusted from 1.1 to 1.9 (zeolites X or Y). In addition, this simple and environment-friendly method may provide inspiration to the synthesis of other hierarchical zeolites.

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“…[28][29][30][31][32][33][34] Among these methods, the organosilane template developed by Ryoo et al has shown high flexibility and versatility in the synthesis of mesoporous zeolite. [35][36][37][38] Herein, we design a new kind of organosilane (1,6-bis (diethyl(3-trimethoxysilylpropyl)ammonium) hexane) with a gemini-type structure for the synthesis of mesoporous zeolite. This template can be easily prepared from the ordinary precursor by a simple synthesis route, and it has been used as an effective mesoporogen for the synthesis of hierarchical porous ZSM-5 zeolite.…”

Section: Introductionmentioning

confidence: 99%

Organosilane with Gemini-Type Structure as the Mesoporogen for the Synthesis of the Hierarchical Porous ZSM-5 Zeolite

et al. 2016

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CitationOrganosilane with gemini-type structure as the mesoporogen for synthesis of hierarchical porous ZSM-5 zeolite 2016 Langmuir Just Accepted "Just Accepted" manuscripts have been peer-reviewed and accepted for publication. They are posted online prior to technical editing, formatting for publication and author proofing. The American Chemical Society provides "Just Accepted" as a free service to the research community to expedite the dissemination of scientific material as soon as possible after acceptance. "Just Accepted" manuscripts appear in full in PDF format accompanied by an HTML abstract. "Just Accepted" manuscripts have been fully peer reviewed, but should not be considered the official version of record. They are accessible to all readers and citable by the Digital Object Identifier (DOI®). "Just Accepted" is an optional service offered to authors. Therefore, the "Just Accepted" Web site may not include all articles that will be published in the journal. After a manuscript is technically edited and formatted, it will be removed from the "Just Accepted" Web site and published as an ASAP article. Note that technical editing may introduce minor changes to the manuscript text and/or graphics which could affect content, and all legal disclaimers and ethical guidelines that apply to the journal pertain. ACS cannot be held responsible for errors or consequences arising from the use of information contained in these "Just Accepted" manuscripts.Organosilane with gemini-type structure as the mesoporogen for synthesis of hierarchical porous ZSM-5 zeolite ABSTRACT: A new kind of organosilane (1,6-bis (diethyl(3-trimethoxysilylpropyl)ammonium) hexane bromide) with a geminitype structure was prepared and used as a mesoporogen for the synthesis of hierarchical porous ZSM-5 zeolite. There are two quaternary ammonium centers along with double hydrolysable -RSi(OMe) 3 fragments in the organosilane, which results in a strong interaction between this mesoporogen and silica-alumina gel. The organosilane can be easily incorporated into ZSM-5 zeolite structure during the crystallization process, and it was finally removed by calcination leading to secondary pores in ZSM-5. The synthesized ZSM-5 has been systematically studied by XRD, nitrogen adsorption, SEM, TEM, TG and solid-state one-dimensional (1D) and two-dimensional (2D) NMR, which reveals information on its detailed structure. It has a hierarchical porosity system, which combines the intrinsic micropores coming from the crystalline structure and irregular mesopores created by the organosilane template. Moreover, the mesoposity including pore size and volume within ZSM-5 can be systematically tuned by changing the organosilane/TEOS ratios, which confirms this organosilane has high flexibility of using as template for the synthesis of hierarchical porous zeolite.

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Generation of Mesoporosity in LTA Zeolites by Organosilane Surfactant for Rapid Molecular Transport in Catalytic Application

Cited by 198 publications

References 40 publications

Direct Synthesis of Functional Zeolitic Materials

Direct Synthesis of Functional Zeolitic Materials

Additive-free synthesis of mesoporous FAU-type zeolite with intergrown structure

Organosilane with Gemini-Type Structure as the Mesoporogen for the Synthesis of the Hierarchical Porous ZSM-5 Zeolite

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