High-quality synthesis of a nanosized CHA zeolite by a combination of a starting FAU zeolite and aluminum sources

Tanigawa, Takuya; Tsunoji, Nao; Sadakane, Masahiro; Sano, Tsuneji

doi:10.1039/d0dt01013h

Cited by 27 publications

(36 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…106 Very recently, some interesting high Si IZC studies have investigated the full course of crystallization, also encompassing the crucial dissolution step. 47,65,107,108 In 2019, our group published work on FAU-to-CHA (Si/Al P ¼ 40) using simply commercial US-Y (CBV780; Zeolyst) and N,N,N-trimethyl-1adamantammonium hydroxide (TMAda-OH) at alkali-free molar batch compositions. 65 Most recently, the investigation was broadened to study FAU-to-MFI under the same conditions, using tetrapropylammonium (TPA) as OSDA.…”

Section: Role Of Al In (Zeolite) Dissolutionmentioning

confidence: 99%

“…39 Recently, the group has given more experimental evidence for the presence of specic aluminosilicate oligomers in IZC solutions via (ex situ) electrospray-ionization mass spectrometry (ESI-MS). 36,108 Higher m/z intensities (m/z range 300-1000) were found aer prolonged synthesis, indicating condensation and adduct formation (with water and SDAs). However, the numerous potential oligomers (and SDA adducts) impede detailed assignment of the output m/z ratios, let alone provide information of their involvement in nucleation and growth.…”

Section: Role Of Al In Nucleationmentioning

confidence: 99%

“…Another interesting contribution regarding dissolution (and overall) kinetics of IZC is the recent work of Tanigawa et al , although their use of seeds (2% wt of the solids) may impair the analysis. 108 They converted FAU into CHA using TMAdaOH and NaOH and compared overall growth kinetics at standard batch composition (Si/Al = 20). As sources they used either a low Si/Al P faujasite (Y) parent with an additional Si source, a high Si US-Y parent with an additional Al source, US-Y alone (true IZC), or conventional Si and Al sources (resp.…”

Section: Role Of Al During the Stages Of Izcmentioning

confidence: 99%

See 2 more Smart Citations

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

2021

View full text Add to dashboard Cite

show abstract

Section: Role Of Al In (Zeolite) Dissolutionmentioning

confidence: 99%

Section: Role Of Al In Nucleationmentioning

confidence: 99%

Section: Role Of Al During the Stages Of Izcmentioning

confidence: 99%

See 1 more Smart Citation

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

2021

View full text Add to dashboard Cite

show abstract

“…have shown that the variation in the Si/Al ratio in the synthesis mixture as well as changing the Si and/or Al sources yields CHA‐type materials of different sizes. [ 17 ] Shinno et al. reported that the initial content of Ge controls the phase composition of the end product in the preparation of chiral STW‐type material.…”

Section: Introductionmentioning

confidence: 99%

Defect Sites in Zeolites: Origin and Healing

et al. 2021

View full text Add to dashboard Cite

This paper deals with the synthesis conditions–defect formation relationship in zeolites. Silicalite‐1 (MFI‐type) is used as a model material. Samples synthesized from a system with high basicity (at 100 °C), a system with moderate basicity (at 150 °C), and a fluoride‐containing system in neutral medium (at 170 °C) are compared. Well‐crystallized materials with sizes ≈0.1, 1–10, and 30–40 µm are obtained. The samples are analyzed by complementary methods providing information on the short‐ and long‐range order in the zeolite framework. A strong correlation between the number of point defects in the zeolite framework and preparation conditions is established. Silicalite‐1 synthesized under mild synthesis conditions from a highly basic system exhibits a larger number of framework defects and thus low hydrophobicity. Further, the calcined samples are subjected to aluminum and silicon incorporation by postsynthesis treatment. The Al/Si incorporation in the zeolite framework and its impact on the physicochemical properties is studied by XRD, TEM/SEM, solid‐state NMR, FTIR, and thermogravimetric analyses. The defects healing as a function of the number of point defects in the initial material and zeolite crystal size is evaluated. The results of this study will serve for fine‐tuning zeolite properties by in situ and postsynthesis methods.

show abstract

“…19 High silica zeolite CHA can be prepared synthetically in which the use of organic SDA such as a trimethyladamantylammonium ion (TMAdaOH) lead to the formation of Al lean zeolite CHA where the Si/Al ratio ranged from 3 to ∞. [18][19][20][21] The resulting zeolite is also denoted as SSZ-13. Benzyltrimethyl ammonium ion (BTMAOH) is also known to lead the formation of zeolite CHA.…”

Section: Introductionmentioning

confidence: 99%

Locating Structure Directing Agent and Al inCHA: Combined Study of Structure Determination of X‐Ray Powder Diffraction and Classical Lattice Energy Calculation

Chang

Park

Cho

2021

Bulletin Korean Chem Soc

View full text Add to dashboard Cite

Locating the structure directing agent and Al in zeolite CHA has been performed using structure determination of X‐ray powder diffraction combined with General Utility Lattice Program (GULP) calculation. Trimethyladamantylammonium ion (TMAdaOH+) and benzyltrimethyl ammonium ion (BTMAOH+), respectively, have been found to fit in the pore, resulting in the formation of high silica zeolite CHA, which shows the superior catalytic performance in abatement of NOx using NH3 in the exhaust gas stream of mobile car. The intimate interaction between the corresponding structure directing agent (SDA) and the counter ion due to the Al substitution in the framework has been characterized using the lattice energy calculation. The difference in the lattice energy of the zeolite CHA prepared with TMAdaOH was large compared to that of the zeolite CHA prepared with BTMAOH, which can be attributed probably to the molecule's size. Thereby, the SDA in the zeolite pore has been located readily and the resulting information can be useful for increasing the understanding in the zeolite formation mechanism and designing novel zeolite.

show abstract

High-quality synthesis of a nanosized CHA zeolite by a combination of a starting FAU zeolite and aluminum sources

Abstract: A combination of three starting components rapidly provides a highly crystalline nanosized CHA zeolite with high yield and a wide synthesis window.

Cited by 27 publications

References 58 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

Defect Sites in Zeolites: Origin and Healing

Locating Structure Directing Agent and Al inCHA: Combined Study of Structure Determination of X‐Ray Powder Diffraction and Classical Lattice Energy Calculation

Contact Info

Product

Resources

About