Nanosized zeolites: Quo Vadis?

Mintova, Svetlana; Grand, Julien; Valtchev, Valentin

doi:10.1016/j.crci.2015.11.005

Cited by 93 publications

(62 citation statements)

References 69 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…12 There are several reviews presenting the latest advances in the study of synthesis strategies, mechanisms of formation, properties, applications and types of zeolites prepared as nanocrystals. 12,[60][61][62][63][64] Traditional synthesis methods to obtain zeolite nanocrystals use clear solutions or gels containing zeolite precursors. Clear solutions are recommended when stable suspensions with smaller and narrow particle size distribution are desired.…”

Section: Nanozeolitesmentioning

confidence: 99%

“…Zeolites are also usually employed to fabricate membranes for gas-vapour and liquid-liquid separation processes. 64 At present, there exist around 20 types of zeolites synthesized at the nanoscale (including SOD, LTA, MTW, MEL, FAU, EMT, MFI, BEA, MOR), 64 but it is presumable that this number will increase progressively. The challenge is to develop efficient strategies to stabilize the nanocrystals into small (o100 nm), discrete and homogeneous particles as well as to improve the control of their physico-chemical properties.…”

Section: Nanozeolitesmentioning

confidence: 99%

See 1 more Smart Citation

From 3D to 2D zeolite catalytic materials

et al. 2018

View full text Add to dashboard Cite

Research activities and recent developments in the area of three-dimensional zeolites and their two-dimensional analogues are reviewed. Zeolites are the most important industrial heterogeneous catalysts with numerous applications. However, they suffer from limited pore sizes not allowing penetration of sterically demanding molecules to their channel systems and to active sites. We briefly highlight here the synthesis, properties and catalytic potential of three-dimensional zeolites followed by a discussion of hierarchical zeolites combining micro- and mesoporosity. The final part is devoted to two-dimensional analogues developed recently. Novel bottom-up and top-down synthetic approaches for two-dimensional zeolites, their properties, and catalytic performances are thoroughly discussed in this review.

show abstract

Section: Nanozeolitesmentioning

confidence: 99%

Section: Nanozeolitesmentioning

confidence: 99%

From 3D to 2D zeolite catalytic materials

et al. 2018

View full text Add to dashboard Cite

show abstract

“…Another strategy to overcome the diffusional barrier imposed on reactants and products is the synthesis of nanosized zeolites. The decrease of common microsized zeolite crystals to nanosized crystals increases the external surface and could facilitate the rapid diffusion of reactants and products [61]. The synthesis of nanosized MCM-22 zeolite was reported using polydiallydimethylammonium chloride (PDDA) as a protecting or stabilizing agent to avoid the self-aggregation and intergrowth of silica colloids by direct synthesis, as shown in the scheme of Figure 10a.…”

Section: Mww-type Materials By Direct Synthesismentioning

confidence: 99%

Lamellar MWW-Type Zeolites: Toward Elegant Nanoporous Materials

Schwanke

Pergher

2018

Applied Sciences

View full text Add to dashboard Cite

This article provides an overview of nanoporous materials with MWW (Mobil twenty two) topology. It covers aspects of the synthesis of the MWW precursor and the tridimensional zeolite MCM-22 (Mobil Composition of Matter number 22) as well as their physicochemical properties, such as the Si/Al molar ratio, acidity, and morphology. In addition, it discusses the use of directing agents (SDAs) to obtain the different MWW-type materials reported so far. The traditional post-synthesis modifications to obtain MWW-type materials with hierarchical architectures, such as expanded, swelling, pillaring, and delaminating structures, are shown together with recent routes to obtain materials with more open structures. New routes for the direct synthesis of MWW-type materials with hierarchical pore architecture are also covered.

show abstract

“…The zeolites synthesized through an ultrafast approach are in the order of nanometers minimizing the possibility of solid precipitation that was beneficial for the stability of the process. However, nanosized zeolites are often submitted to post‐synthesis treatment to avoid aggregation between the particles . Moreover, the collecting step is carried out by several cycles of high‐speed centrifugation which is not viable from an industrial viewpoint.…”

Section: Introductionmentioning

confidence: 99%

Continuous flow synthesis of zeolite FAU in an oscillatory baffled reactor

Mendoza

Pereira

Gerven

et al. 2020

J Adv Manuf & Process

View full text Add to dashboard Cite

In this work, we report, for the first time, the continuous flow synthesis of zeolite NaX successfully accomplished in a pilot-scale (up to 100 L/h) continuous oscillatory baffled reactor (COBR). The continuous synthesis was achieved by combining the seed-assisted method, in-line mixing of reactants at high temperature and COBR. The use of a COBR not only allowed the same residence time as the batch system, but also a controlled temperature profile, thanks to the plug flow behavior and effective heat transfer. A stable continuous operation was maintained during 5 hours owing to an effective mixing, preventing any hydrodynamic failure caused by the sedimentation of zeolite crystals. The results showed that zeolite NaX was obtained after 99 minutes and crystals between 0.6 and 0.7 μm were observed by scanning electron microscopy. The effect of frequency and amplitude on crystal properties was assessed. Sampling at three points along the COBR allowed the study of steady states of the zeolite concentration in temporal and spatial domains.continuous oscillatory baffled reactor, continuous zeolite synthesis, NaX zeolite, reactive heating crystallization

show abstract

Nanosized zeolites: Quo Vadis?

Cited by 93 publications

References 69 publications

From 3D to 2D zeolite catalytic materials

From 3D to 2D zeolite catalytic materials

Lamellar MWW-Type Zeolites: Toward Elegant Nanoporous Materials

Continuous flow synthesis of zeolite FAU in an oscillatory baffled reactor

Contact Info

Product

Resources

About