High silica zeolites with three-dimensional systems of large pore channels

Camblor, Miguel Á.; Barrett, P. A.; Díaz–Cabañas, María J.; Villaescusa, Luis A.; Puche, Marta; Boix, T.; Pérez, Eva; Koller, Hubert

doi:10.1016/s1387-1811(01)00325-0

Cited by 138 publications

(133 citation statements)

References 18 publications

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“…2d). According to thermal analyses and 1 H NMR spectroscopy about 2 diquat cations are occluded per unit-cell, the organic weight content (about 16.5%) being close to the value found for zeolite beta prepared with tetraethylammonium cations [25]. The F -/diquat molar ratio is again anomalously low, actually only slightly higher than 1, instead of being close to 2, may be due to the presence of some 3 Q connectivity defects.…”

Section: Syntheses In the Presence Of The N-diquatsupporting

confidence: 66%

Synthesis of Zeolites in the Presence of Diquaternary Alkylammonium Ions as Structure-Directing Agents

Caullet

Paillaud

Mathieu

et al. 2007

Oil & Gas Science and Technology - Rev. IFP

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Section: Syntheses In the Presence Of The N-diquatsupporting

confidence: 66%

Synthesis of Zeolites in the Presence of Diquaternary Alkylammonium Ions as Structure-Directing Agents

Caullet

Paillaud

Mathieu

et al. 2007

Oil & Gas Science and Technology - Rev. IFP

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“…31 The BEA seeds used for the reactions were calcined at 500 °C, so any signals observed in the ] cage of the framework ( Figure S2). 24 The zeolite BEA synthesized under our conditions has relatively small crystal sizes as shown in the SEM images (Figures 6c-d). Under higher magnification, we can see that the F-BEA made under our conditions shows the truncated squared pyramidal shape of the highly faulted BEA structure.…”

Section: Tetraethylammonium Hydroxide (Teaoh) As Sda For Zeolite Betamentioning

confidence: 74%

“…The chemical shift for SiF 6 2-has been reported in several studies and usually falls in the range of -120 to -130 ppm. [24][25][26] According to a previous study, the resonance at -68.5 ppm corresponds to the fluoride that is covalently bonded to Si(9) of the ZSM-5 framework. 27 There is also a weak signal at -78.6 ppm, which is not usually seen in the high-temperature hydrothermally synthesized F-MFI.…”

Section: Resultsmentioning

confidence: 99%

“…There is also a very weak D r a f t 11 signal at -126.7 ppm that is due to the SiF 6 2-impurity. [24][25][26] The small peak at -81.1 ppm is assigned to F -inside the framework. SEM images show the crystals often aggregate together (Figure 6e).…”

Section: -39mentioning

confidence: 99%

“…The ppm. [24][25][26] DECDMPI (Figure 1b) was also used as SDA to produce ZSM-11 in the same DES. This molecule is known to have the ability of producing phase-pure MEL under hydrothermal and dense gel conditions.…”

Section: 5-dimethylpiperidinium Iodide (Decdmpi) As Sdas For the Smentioning

confidence: 99%

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Syntheses of high-silica zeolites in urea/choline chloride deep eutectic solvent

Lin

Huang

2016

Can. J. Chem.

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This paper presents the first example of high-silica and siliceous zeolite synthesis in the urea/choline chloride mixture as a deep eutectic solvent (DES) using F– as the mineralizing agent. A urea/choline chloride mixture was previously used as solvent to prepare AlPO4-based microporous materials SIZ-2 and AlPO-CJ2. However, generating these materials depends on the formation of ammonium ion as a structure-directing agent (SDA) that is the side product of urea decomposition. In the present study, we show that several highly siliceous zeolites with targeted topologies (MFI, BEA, MEL, and MTN) can be purposely synthesized by adding SDAs of choice rather than relying on solvent decomposition. The Si atoms in zeolite Beta synthesized in a urea/choline chloride mixture exhibit exceptionally high local ordering as shown in a 29Si MAS NMR spectrum. The synthesis of ZSM-11 using eutectic solvents or ionic liquid has not been reported. The major challenge in ZSM-11 synthesis is the intergrown structure formed with ZSM-5 due to the high similarity in their topologies. The present work shows that preparation of pure ZSM-11 can be achieved in urea/choline chloride DES using either DPHMII or DECDMPI as SDA. Using a urea/choline chloride mixture rather than alcohol-based traditional nonaqueous solvents is the key for the success of preparing phase-pure ZSM-11 free of any MFI intergrowths. This is because some alcohols can serve as SDA for MFI. The use of urea/choline chloride based DES eliminates the potential templateing effect of solvent for MFI formation. For MTN zeolite, morphology may be controlled in urea/choline chloride by choosing different SDAs. The disadvantage of this system is the long reaction times.

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The Fluoride Route: A Good Opportunity for the Preparation of 2D and 3D Inorganic Microporous Frameworks

Paillaud

Caullet

Brendlé

et al. 2010

Functionalized Inorganic Fluorides

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High silica zeolites with three-dimensional systems of large pore channels

Cited by 138 publications

References 18 publications

Synthesis of Zeolites in the Presence of Diquaternary Alkylammonium Ions as Structure-Directing Agents

Synthesis of Zeolites in the Presence of Diquaternary Alkylammonium Ions as Structure-Directing Agents

Syntheses of high-silica zeolites in urea/choline chloride deep eutectic solvent

The Fluoride Route: A Good Opportunity for the Preparation of 2D and 3D Inorganic Microporous Frameworks

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