Manipulation of amorphous precursors to enhance zeolite nucleation

Parmar, Deependra; Niu, Zhiyin; Yu, Liang; Dai, Heng; Rimer, Jeffrey D.

doi:10.1039/d1fd00096a

Cited by 21 publications

(12 citation statements)

References 71 publications

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“…272 The adsorption of polymers such as polydiallyldimethylammonium (PDDA) 273 or polyacrylamide 274 on zeolite precursors can also induce particle aggregation at an optimal polymer concentration (Figure 13d), enhancing the rate of zeolite crystallization. 275 It was hypothesized that the interstitial regions between aggregated precursor particles provide a confined region that promotes zeolite nucleation through a more rapid exchange of species between solid and solution phases, as illustrated in Figure 13d. The presence of aluminum on the external surfaces of colloidal particles can affect the rate of silica dissolution, which is often inferred from changes in solution pH or conductivity.…”

Section: Colloidal Particlesmentioning

confidence: 99%

The Current Understanding of Mechanistic Pathways in Zeolite Crystallization

Mallette,

Shilpa,

Rimer

2024

Chem. Rev.

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Zeolite catalysts and adsorbents have been an integral part of many commercial processes and are projected to play a significant role in emerging technologies to address the changing energy and environmental landscapes. The ability to rationally design zeolites with tailored properties relies on a fundamental understanding of crystallization pathways to strategically manipulate processes of nucleation and growth. The complexity of zeolite growth media engenders a diversity of crystallization mechanisms that can manifest at different synthesis stages. In this review, we discuss the current understanding of classical and nonclassical pathways associated with the formation of (alumino)silicate zeolites. We begin with a brief overview of zeolite history and seminal advancements, followed by a comprehensive discussion of different classes of zeolite precursors with respect to their methods of assembly and physicochemical properties. The following two sections provide detailed discussions of nucleation and growth pathways wherein we emphasize general trends and highlight specific observations for select zeolite framework types. We then close with conclusions and future outlook to summarize key hypotheses, current knowledge gaps, and potential opportunities to guide zeolite synthesis toward a more exact science.

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Section: Colloidal Particlesmentioning

confidence: 99%

The Current Understanding of Mechanistic Pathways in Zeolite Crystallization

Mallette,

Shilpa,

Rimer

2024

Chem. Rev.

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“…Rimer and co-workers showed that alkali (K + or Na + )-infused amorphous precursors reduced the crystallization time by more than 50% for LTL-, MOR-, and CHA-type zeolites compared to synthesis using asreceived fumed silica, whereas there was little impact on the synthesis of MFI-type zeolite. 105,129,130 Although the exact effect of alkali-infused amorphous silica on enhancing the rates of crystal formation remains elusive, they explained the presence of alkali metal inside the amorphous silicates could act as an inorganic SDA and promote particle aggregation.…”

Section: Perspectives and Outlookmentioning

confidence: 99%

Synthesis strategies to control the Al distribution in zeolites: thermodynamic and kinetic aspects

Bae

Dusselier

2023

Chem. Commun.

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“…Recent studies have shown the versatility and effectiveness of adjusting the nucleation/crystallization growth kinetics of zeolites to form an optimal morphology. [14,[39][40][41][42][43] Notably, seeded methods can provide nuclei or growth sites directly into the nutrients, which can increase crystallization rates and reduce crystal size or introduce mesopores. [40,[44][45][46][47] Although these methods are effective, the produced hierarchical zeolites are usually polycrystalline aggregates of small particles or with sole isolated mesopores.…”

Section: Introductionmentioning

confidence: 99%

“…In particular, developing effective ways to modulate the growth/crystallization behavior of zeolites to create intrapenetrated hierarchical structure is highly desired to eliminate the need of expensive templates and avoid the fragile framework caused by removing organic mesoporogens. Recent studies have shown the versatility and effectiveness of adjusting the nucleation/crystallization growth kinetics of zeolites to form an optimal morphology [14,39–43] . Notably, seeded methods can provide nuclei or growth sites directly into the nutrients, which can increase crystallization rates and reduce crystal size or introduce mesopores [40,44–47] .…”

Section: Introductionmentioning

confidence: 99%

Constructing Intrapenetrated Hierarchical Zeolites with Highly Complete Framework via Protozeolite Seeding

Liu,

Wang,

et al. 2023

Angew Chem Int Ed

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Creation of intrapenetrated mesopores with open highway from external surface into the interior of zeolite crystals are highly desirable that can significantly improve the molecular transport and active sites accessibility of microporous zeolites to afford enhanced catalytic properties. Here, different from traditional zeolite‐seeded methods that generally produced isolated mesopores in zeolites, nanosized amorphous protozeolites with embryo structure of zeolites were used as seeds for the construction of single‐crystalline hierarchical ZSM‐5 zeolites with intrapenetrated mesopores (mesopore volume of 0.51 cm3g‐1) and highly complete framework. In this strategy, in contrast to the conventional synthesis, only a small amount of organic structure directing agents and a low crystallization temperature were adopted to promise the protozeolites as the dominant growth directing sites to induce crystallization. The protozeolite nanoseeds provided abundant nucleation sites for surrounding precursors to be crystallized, followed by oriented coalescence of crystallites resulting in the formation of intrapenetrated mesopores. The as‐prepared hierarchical ZSM‐5 zeolites exhibited ultra‐long lifetime of 443.9 hours and a high propylene selectivity of 47.92 % at a WHSV of 2 h‐1 in the methanol‐to‐propylene reaction. This work provides a facile protozeolite‐seeded strategy for the synthesis of intrapenetrated hierarchical zeolites that are highly effective for catalytic applications.

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Manipulation of amorphous precursors to enhance zeolite nucleation

Abstract: Crystallization in media comprised of amorphous precursors is becoming a more common phenomenon for numerous synthetic, biological, and natural materials that grow by a combination of classical and nonclassical pathways....

Cited by 21 publications

References 71 publications

The Current Understanding of Mechanistic Pathways in Zeolite Crystallization

The Current Understanding of Mechanistic Pathways in Zeolite Crystallization

Synthesis strategies to control the Al distribution in zeolites: thermodynamic and kinetic aspects

Constructing Intrapenetrated Hierarchical Zeolites with Highly Complete Framework via Protozeolite Seeding

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