Fast and efficient synthesis of SSZ-13 by interzeolite conversion of Zeolite Beta and Zeolite L

Tang, Lu; Haw, Kok‐Giap; Zhang, Yiying; Fang, Qianrong; Qiu, Shilun; Valtchev, Valentin

doi:10.1016/j.micromeso.2019.02.021

Cited by 47 publications

(16 citation statements)

References 44 publications

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“…The 29 Si MAS NMR technique was applied to investigate the distribution of framework Al (Figure 1) [42]. All the spectra showed two peaks at −110 and −105 ppm, which correspond to Q 4 (0Al) and Q 4 (1Al), respectively, where Q 4 (nAl) is Si(OSi) 4−n (OAl) n .…”

Section: Evaluation Of Al Species In Cha Structurementioning

confidence: 99%

“…For 27 Al MAS (Magic Angle Spinning) NMR spectra, the 27 Al chemical shift was referenced to −0.54 ppm, AlNH 4 (SO 4 ) 2 •12H 2 O. For 29 Si MAS and 29 Si CP/MAS NMR spectra, the 29 Si chemical shift was referenced to −34.12 ppm using polydimethylsiloxane (PDMS)(Sigma-Aldrich, St. Louis, MO, USA).…”

Section: Relative Crystallinity Of Ltl Fau =mentioning

confidence: 99%

“…Recently, besides FAU, various zeolites have been used as raw material via the so-called "interzeolite conversion (IZC)" method [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30]. CHA has been synthesized with a short crystallization time using FAU-and PHI-type zeolites as raw material in the presence of TMAda + [16,17].…”

Section: Introductionmentioning

confidence: 99%

“…CHA has been synthesized with a short crystallization time using FAU-and PHI-type zeolites as raw material in the presence of TMAda + [16,17]. CHA has also been synthesized using LTL-type aluminosilicate zeolite (hereinafter called LTL) in the presence of TMAda + [28,29]. In addition to the type of zeolite as raw material, the influence of OSDA on the composition of the final product has been studied [31,32].…”

Section: Introductionmentioning

confidence: 99%

“…a Si/Al (NMR) : Si/Al atomic ratio in the sample determined by29 Si MAS NMR spectra. b Q 4 (nAl): Si(OSi) 4−n (OAl) n .…”

mentioning

confidence: 99%

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CHA-Type Zeolite Prepared by Interzeolite Conversion Method Using FAU and LTL-Type Zeolite: Effect of the Raw Materials on the Crystallization Mechanism, and Physicochemical and Catalytic Properties

et al. 2020

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The effect of the raw materials including parent zeolite as aluminosilicate sources and organic structure-directing agents (OSDAs) on the crystallization mechanism, and physicochemical and catalytic properties of the CHA-type aluminosilicate zeolite was investigated. For this purpose, the FAU-type and the LTL-type zeolites were used as raw material, and trymethyladamantyl ammonium hydroxide and tetraethyl ammonium hydroxide were used as OSDAs. We firstly found that the CHA-type aluminosilicate zeolite was crystallized from the combination of the LTL-type zeolite and tetraethyl ammonium hydroxide as raw materials. The crystallization behaviors were also monitored in detail. The crystallization was delayed by using the LTL-type zeolite as the starting material regardless of the type of OSDA because of the low solubility of the LTL-type zeolite compared to the FAU-type zeolite. We have found that the Al distribution in the CHA framework was dependent on the raw materials. Thus, the prepared CHA-type aluminosilicate zeolite from the LTL-type zeolite exhibited a high thermal stability and catalytic performance in the methanol to olefins reaction.

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Section: Evaluation Of Al Species In Cha Structurementioning

confidence: 99%

Section: Relative Crystallinity Of Ltl Fau =mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…a Si/Al (NMR) : Si/Al atomic ratio in the sample determined by29 Si MAS NMR spectra. b Q 4 (nAl): Si(OSi) 4−n (OAl) n .…”

mentioning

confidence: 99%

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CHA-Type Zeolite Prepared by Interzeolite Conversion Method Using FAU and LTL-Type Zeolite: Effect of the Raw Materials on the Crystallization Mechanism, and Physicochemical and Catalytic Properties

et al. 2020

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Key Factors During the Milling Stage of the Seed‐assisted and Solvent‐free Synthesis of MFI and Catalytic Behavior in the Alkylation of Phenol with Tert‐butyl Alcohol

et al. 2021

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The so-called mechanochemical method for the synthesis of zeolites reduces the generation of liquid residues and gaseous pollutants as compared to the conventional solvothermal method. Different types of zeolites have been synthesized at the laboratory scale with this method using mostly pestle and mortar. However, such an approach hinders both the systematic comprehension of the effects of the input variables of the milling process and its further scale-up towards the synthesis of the zeolites and their catalytic application. This work investigates the influence of key factors involved in the ball milling stage of the mechanochemical route for the synthesis of MFI done with the assistance of a commercial MFI seed and in the absence of solvents over the most salient physicochemical properties of this type of materials, i.e. the recovery percentage, production cost, morphology, surface area and porosity, crystallinity, acidity of the protonated MFI and catalytic performance. The synthesis of the materials was planned and executed following a full 2 4 factorial experiment whose input variables were the Na2O/SiO2 and H2O/SiO2 molar ratios and the milling time and speed. The effects of both main and interaction factors over key physicochemical properties, and catalytic behavior of the synthesized materials on the alkylation of phenol with tert-butyl alcohol were established within the explored sampling space. Results showed that the Na2O/SiO2 molar ratio plays a key role for the mechanochemical synthesis of MFI, since this variable may direct the synthesis to the preferential production of MOR instead of MFI. On the other hand, it was found that the milling time and speed and their interactions markedly impact the textural properties of MFI. Furthermore, the triple interaction between the input variables affected the concentration of Lewis acid sites of the produced materials. These effects were rationalized by considering that sodium can act as a structure directing agent during the mechanochemical synthesis of MFI and also can promote the incorporation of aluminum to its structure. On the other hand, the milling time and speed are non-linearly correlated to the milling energy required for forming the aluminosilicate precursor that crystallizes during the hydrothermal stage of the process. Overall, all the zeolites synthesized by the mechanochemical route were less crystalline than both the MFI used as seed and an MFI synthesized by solgel. This was associated to the formation of amorphous agglomerates around the zeolitic crystals. Finally, the catalytic behavior of the mechanochemical MFI zeolites in the studied reaction was found to be linearly and positively correlated with both the concentration of BrØnsted of sites and with the density of acid sites. The catalytic tendencies were consistent with the proposal of a stepwise Langmuir-Hinshelwood mechanism for the alkylation of phenol with tert-butyl alcohol.

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Progress in Seed-assisted Synthesis of (Silico)Aluminophosphate Molecular Sieves

Zhang

Yang

Tian

et al. 2022

Chem. Res. Chin. Univ.

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Fast and efficient synthesis of SSZ-13 by interzeolite conversion of Zeolite Beta and Zeolite L

Cited by 47 publications

References 44 publications

CHA-Type Zeolite Prepared by Interzeolite Conversion Method Using FAU and LTL-Type Zeolite: Effect of the Raw Materials on the Crystallization Mechanism, and Physicochemical and Catalytic Properties

CHA-Type Zeolite Prepared by Interzeolite Conversion Method Using FAU and LTL-Type Zeolite: Effect of the Raw Materials on the Crystallization Mechanism, and Physicochemical and Catalytic Properties

Key Factors During the Milling Stage of the Seed‐assisted and Solvent‐free Synthesis of MFI and Catalytic Behavior in the Alkylation of Phenol with Tert‐butyl Alcohol

Progress in Seed-assisted Synthesis of (Silico)Aluminophosphate Molecular Sieves

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