Simple approach in understanding interzeolite transformations using ring building units

Suhendar, Dede; Buchari,; Mukti, Rino R.; Ismunandar,

doi:10.1088/1757-899x/349/1/012016

Cited by 15 publications

(19 citation statements)

References 42 publications

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“…Suhendar et al indeed concluded that the most suitable predictor for successful IZC are the smallest components, namely the ring building units (RBU). 40 This is in line with the computational work of Schwalbe-Koda et al , who reported that 65% of the investigated parent–daughter interconversions do not have any CBUs. 46 Suhendar et al also described the different relation of the proposed RBU intermediate species (4MR, 5MR and 6MR, i.e.…”

Section: Introductionsupporting

confidence: 88%

“…As mentioned earlier (3.1), the correlation of IZC parent-daughters via RBUs (with particular Al tendency) is striking, 40 but this may be related to the chemistry of Al rather than due to its structural features. It is interesting to consider the proposed RBU approach by Suhendar et al 40 (and applied by Dos Santos) 127 from a chemical (charge balancing) rather than from a structural perspective due to the particular role of Al in it. Taken altogether, it is not (yet) possible to directly elucidate the nature and evolution of aluminosilicate precursors (X) taking part in (especially) nucleation and growth, also for those dissolving from crystalline lattices.…”

Section: Role Of Al In Nucleationmentioning

confidence: 50%

“…However, recent efforts have demonstrated that these simple criteria are inadequate for generalization. 3,5,40,41 A rst remark is given on the thermodynamics. Dense frameworks are indeed more stable than low density frameworks in the case of defect-free silicates, as backed by computational studies.…”

Section: Conventional Understanding Of Izc Synthesismentioning

confidence: 99%

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On the key role of aluminium and other heteroatoms during interzeolite conversion synthesis

2021

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Section: Introductionsupporting

confidence: 88%

Section: Role Of Al In Nucleationmentioning

confidence: 50%

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On the key role of aluminium and other heteroatoms during interzeolite conversion synthesis

2021

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“…One method of minimizing or eliminating OSDAs in zeolite synthesis is the use of a parent crystal that undergoes an interzeolite transformation to a desired (daughter) structure . This approach has been demonstrated for a range of metastable zeolites, such as faujasite (FAU) and beta (*BEA) .…”

Section: Figurementioning

confidence: 99%

Organic‐Free Interzeolite Transformation in the Absence of Common Building Units

Qin

Jain

Hernández

et al. 2019

Chemistry A European J

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Zeolite crystals can be used as seeds or aluminosilicate sources in syntheses to control polymorphs and/or reduce the quantity of organics used as structure‐directing agents. A frequently invoked hypothesis for interzeolite transformations is that zeolites share some underlying similarity in structure, most notably in cases pertaining to organic‐free syntheses. Herein, we show for the first time that ZSM‐5 (MFI) can be directly obtained from USY (FAU) through an interzeolite transformation between parent–daughter structures lacking common building units in the absence of a structure‐directing agent and seeds. We show that interzeolite transformation leads to a crystalline product with fewer defects. Our findings also reveal that ZSM‐5 is a metastable intermediate that undergoes further transformation to mordenite (MOR) and quartz. The MFI‐to‐MOR transition is counter to reported trends for which transformations lead to structures with reduced molar volume. Herein, we propose mechanistic arguments that suggest the driving force for interzeolite transformation is more complex than guidelines posited in the literature.

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“…Nonetheless, FAU to GIS transformation does not have the same CBUs, indicating that, for this transformation, this factor is not as important. Suhendar et al 2018 [47] studied the influence of framework density and the CBU (Composite Building Unit), SBU (Secondary Building Unit), and RBU (Ring Building Unit). In this study, the authors show that zeolitic fragments or dissolved silica rarely match CBUs.…”

Section: Discussionmentioning

confidence: 99%

Interzeolitic Transformation of Clinoptilolite into GIS and LTA Zeolite

2021

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A natural clinoptilolite zeolite was transformed into other zeolites of greater industrial interest, such as zeolites with GIS and LTA structures. The synthesis conditions were studied, and the interzeolitic transformation was characterized by X-ray diffraction (XRD), X-ray fluorescence (FRX), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). From the results, it was possible to observe that the GIS and LTA zeolites were successfully synthesized. Furthermore, the results revealed that a synthesis time of 4 days was enough to obtain the GIS structure, and 4 h was sufficient to obtain LTA. The interzeolitic transformation can be explained by the RBU (Ring Building Unit) approach using C4 units from the HEU topology. The use of clinoptilolite in the synthesis of other zeolites is an innovative, economically viable, and environmentally sustainable process that exploits a material that exists in large quantities and is still little explored by industry.

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Simple approach in understanding interzeolite transformations using ring building units

Cited by 15 publications

References 42 publications

On the key role of aluminium and other heteroatoms during interzeolite conversion synthesis

On the key role of aluminium and other heteroatoms during interzeolite conversion synthesis

Organic‐Free Interzeolite Transformation in the Absence of Common Building Units

Interzeolitic Transformation of Clinoptilolite into GIS and LTA Zeolite

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