Conversion of Protonated Magadiite to a Crystalline Microporous Silica Phase via a New Layered Silicate

Kooli, Fethi; Kiyozumi, Yoshimichi; Mizukami, Fujio

doi:10.1002/1439-7641(20010917)2:8/9<549::aid-cphc549>3.0.co;2-i

Cited by 19 publications

(2 citation statements)

References 21 publications

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“…The conversion of magadiite into silicalite-1 has been investigated in detail by Feng et al Mn-silicalite-1 has also been prepared by Mn 2+ ion exchanged magadiite . MOR zeolite has been successfully prepared from magadiite using tetraethylammonium hydroxide as an intercalating agent and/or organic structure directing agent (OSDA). , Kooli et al successfully synthesized KLS-1, KLS-2, FLS-1, and FLS-2 via the conversion of H-magadiite. − High silica ferrierites were prepared from Al-containing hydrous magadiite in both hydrothermal and solid-state reactions. , In 2016, Kooli et al reported that RUB-15 and PLS materials could be obtained from H-magadiite by “pseudo solid-state” conversion with a drop of water added into the synthesis system. , In our pervious works, mordenite, ZSM-5, ferrierite, , offretite, and omega , were successfully obtained via the conversion of magadiite in the present of various organic templates. In our effort, we presented several reports on the role of short-chain tetraalkylammonium cations in the transformation of magadiite and the crystallization mechanism of the conversion of magadiite into zeolite L and zeolite omega was investigated in detail, − which provided a useful route to understand the zeolite formation mechanism by using magadiite as a synthetic precursor.…”

Section: Introductionmentioning

confidence: 99%

Seed-Assisted Synthesis of Zeolite Beta from Solid-State Conversion of Magadiite and an Investigation on the Crystallization Mechanism

Zhang

Feng

et al. 2020

Ind. Eng. Chem. Res.

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Pure zeolite beta was synthesized by conversion of magadiite in solid state with the assistance of seeds for the first time, and the influence of synthesis parameters was discussed in detail. To get further insights into the conversion process, changes of building units and crystallization mechanism were studied by X-ray diffraction, electron microscopy, FT-IR spectroscopy, and solid-state MAS NMR spectroscopy: most parts of 5Rs and 6Rs in magadiite were preserved in the conversion course, and the appearance of 4Rs, which could be a key to the growth of zeolite beta, was promoted by rearrangement and connection of preserved 5Rs. A trace of constitution water existing in the layer structure of magadiite would be important for a successful conversion because it could facilitate the condensation of aluminosilicate species into the beta framework.

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Section: Introductionmentioning

confidence: 99%

Seed-Assisted Synthesis of Zeolite Beta from Solid-State Conversion of Magadiite and an Investigation on the Crystallization Mechanism

Zhang

Feng

et al. 2020

Ind. Eng. Chem. Res.

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“…FTIR also shows the presence of FHS in the FHS/H-mag sample (Figure 1B). FHS/H-mag had an absorption band at 447 cm −1 assigned to the vibrations in FeO 6 of FHS (Ristić et al, 2005;Wei and Nan, 2011), in addition to those at 543, 574, and 611 cm −1 assigned to the Si-O-Si bending vibration, those at 707 and 784 cm −1 attributed to the Si-O-Si stretching vibration, and those from 1,000 to 1,260 cm −1 assigned to the Si-O-Si asymmetric stretching vibration (Kooli et al, 2001). Note that the characteristic absorption band due to the sulfate (SO 4 2-) moiety of FHS, which should be observed in the range of 900-1,300 cm −1 (Ristić et al, 2005), are overlapped by the absorption bands due to the silicate framework.…”

Section: Photocatalytic Decomposition/ Dehydrogenation Of Famentioning

confidence: 98%

Immobilization of Iron Minerals on a Layered Silicate for Enhancing its Solar Photocatalytic Activity toward H2 Production

et al. 2021

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The development of efficient and cost-effective solar photocatalysts capable of producing hydrogen from formic acid as a hydrogen storage medium is still a challenging issue. Herein, we report that iron minerals, ferric iron hydroxy sulfates (FHS), immobilized on a natural layered silicate, magadiite, can be used as a photocatalyst to produce hydrogen from formic acid under irradiation with solar simulator. The material exhibits the hydrogen production rate of 470 μmol g−1 h−1, which is considerably higher than that obtained on other iron minerals and comparable to that obtained on precious metal-based photocatalyst ever reported. The present result may open a way to design efficient photocatalyst for hydrogen production from formic acid in an economically and environmentally friendly way.

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Solvothermal conversion of magadiite into zeolite omega in a glycerol–water system

Cui

Wang

Liu

et al. 2013

J of Chemical Tech & Biotech

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BACKGROUND Zeolite omega is used as a catalyst in various fields. Expensive tetramethylammonium cations are the conventional structure‐directing agents for the synthesis of zeolite omega. In this work, glycerol was used as both solvent and structure‐directing agent instead of expensive quaternary ammonium compounds. Zeolite omega has been obtained through conversion of magadiite in this glycerol–water system. The effects of various parameters such as reaction time, temperature, alkalinity and glycerol content were discussed. RESULTS Pure zeolite omega could be obtained at 120°C for 10 days with the reactants molar composition of 14 SiO2: Al2O3: 10 Na2O: 169 H2O: 200 glycerol. Water content plays an important role in the solvothermal conversion of magadiite to zeolite omega. CONCLUSION The zeolite omega obtained from this system is a rather pure phase free from impurities. A preferential location of the Al atoms in the six‐membered rings of the gmelinites in zeolite omega was observed. A method including extraction and calcination was introduced to remove organic species by which highly ordered pore structure of zeolite was well retained. The present work develops a novel synthesis method for zeolite omega. © 2013 Society of Chemical Industry

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Conversion of Protonated Magadiite to a Crystalline Microporous Silica Phase via a New Layered Silicate

Cited by 19 publications

References 21 publications

Seed-Assisted Synthesis of Zeolite Beta from Solid-State Conversion of Magadiite and an Investigation on the Crystallization Mechanism

Seed-Assisted Synthesis of Zeolite Beta from Solid-State Conversion of Magadiite and an Investigation on the Crystallization Mechanism

Immobilization of Iron Minerals on a Layered Silicate for Enhancing its Solar Photocatalytic Activity toward H2 Production

Solvothermal conversion of magadiite into zeolite omega in a glycerol–water system

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