Accelerated synthesis of zeolites via radicalized seeds

Cheng, Peng; Song, Manxi; Zhang, Hongdan; Yang, Xuan; Wu, Chunyang

doi:10.1007/s10853-018-3178-3

Cited by 15 publications

(8 citation statements)

References 20 publications

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“…Besides the above reasons for the success of milled seeds in the synthesis of zeolites such as increased number of small particles, hence more nucleation sites, Zhang et al have shown that mechanochemical treatment of seed crystals in a mill forms oxygen radicals that are beneficial for the crystallisation. 85,86 The effect of radicals on zeolite synthesis had been reported earlier by the same group, 87 where UV radiation or a reagent were necessary to generate the radical species. In their more recent work, the authors show the much more economical possibility of radical formation through mechanochemical means, by ball milling of LTA, silicalite-1, and beta seed crystals.…”

Section: Dalton Transactionsmentioning

confidence: 82%

New avenues for mechanochemistry in zeolite science

Rainer

Morris

2021

Dalton Trans.

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Section: Dalton Transactionsmentioning

confidence: 82%

New avenues for mechanochemistry in zeolite science

Rainer

Morris

2021

Dalton Trans.

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“…In the work of Cheng et al (2019), NaA (LTA) and silicate-1 (MFI) could both be made in a shorter period by the addition of those radicalized seeds. Comparing the XRD patterns of the milled and heated seeds to the normal ones, a much weaker intensity was observed in the radicalized seeds, which was anticipated to be related to the disassembly of the ordered structure . However, the disruption of the structure may also be responsible for the generation of surface silicon-based radicals (Si–O•) resulting from homolytic bond breaking, − later confirmed by electron paramagnetic resonance.…”

Section: Changing the Chemical Environmentmentioning

confidence: 84%

“…However, the disruption of the structure may also be responsible for the generation of surface silicon-based radicals (Si–O•) resulting from homolytic bond breaking, − later confirmed by electron paramagnetic resonance. These radicals are said to further react with H 2 O to form hydroxyl free radicals (•OH) and then boost zeolite crystallization …”

Section: Changing the Chemical Environmentmentioning

confidence: 99%

“…Ball-milling seeds is frequently used in order to create a positive effect during the crystallization step itself. As mentioned above (free-radical-assisted synthesis), ball-milling in combination with heating can lead to the introduction of radicals and thus faster crystallization . Okubo and co-workers also used milled seeds for their ultrafast synthesis of MOR in a PFR reactor .…”

Section: Hybrid Strategiesmentioning

confidence: 99%

“…Comparing the XRD patterns of the milled and heated seeds to the normal ones, a much weaker intensity was observed in the radicalized seeds, which was anticipated to be related to the disassembly of the ordered structure. 159 However, the disruption of the structure may also be responsible for the generation of surface siliconbased radicals (Si−O•) resulting from homolytic bond breaking, 160−163 later confirmed by electron paramagnetic resonance. These radicals are said to further react with H 2 O to form hydroxyl free radicals (•OH) and then boost zeolite crystallization.…”

Section: Chemistry Of Materialsmentioning

confidence: 99%

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Zeolite Synthesis under Nonconventional Conditions: Reagents, Reactors, andModi Operandi

Deneyer

Devos

et al. 2020

Chem. Mater.

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A myriad of tetrahedral molecular sieve frameworks, often siliceous, can be calculated in silico. Only a tiny fraction (<0.1%) of these can be synthesized on purpose. Only a small fraction of these available frameworks, mostly those composed of only Si and Al as T-atoms, i.e. true zeolites, are used commercially. A gap thus exists between what should be possible (thermodynamically) and what can be produced (kinetically) and used in real life. Even if a synthesis is successful (in industry or academia), flexibility with regard to synthesis parameters -in terms of time, amount of unit operations, OSDA-efficiency, etc. -as well as the obtained material properties -in terms of Si/Al ratio, Al-distribution, T-atom variety, crystal size, etc. -remains limited. These limitations are not surprising since conventional zeolite syntheses, i.e. hydrothermal synthesis in batch from amorphous or soluble Si-and Al-sources, have limited degrees of freedom (DOF). Typically, the type of ingredients, their ratios, a constant temperature, synthesis time and the absence or presence of agitation are varied. In order to take new steps towards more cost-competitive syntheses, and more importantly, zeolites with a greater flexibility in terms of structural properties, this review highlights all DOFs that can be introduced in addition to or on top of the conventional way of synthesis. By doing this, a distinction is made between non-conventional DOFs that influence the chemistry of the system (e.g. interzeolite conversion, charge density mismatch approach, ionothermal or free-radical assisted synthesis) and non-conventional DOFs that influence the physical environment (e.g. ultrasounds, alternative energy via microwaves or continuous set-ups). The review concludes with learnings, practical insights and future opportunities. In other words: which zeolite synthesis strategies really make a difference and which ones are just tweaking around the edges?

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Hydroxyl radicals-mediated zeolite crystallization: impacts on the kinetics, crystal morphologies, and catalytic application

Novita,

Kadja

2024

J Porous Mater

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Accelerated synthesis of zeolites via radicalized seeds

Cited by 15 publications

References 20 publications

New avenues for mechanochemistry in zeolite science

New avenues for mechanochemistry in zeolite science

Zeolite Synthesis under Nonconventional Conditions: Reagents, Reactors, andModi Operandi

Hydroxyl radicals-mediated zeolite crystallization: impacts on the kinetics, crystal morphologies, and catalytic application

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