Ultrasonic monitoring of zeolite A and Metal Organic Frameworks (MOFs) formations: A comparative study

Baser, Hasan; Schwieger, Wilhelm

doi:10.1016/s0167-2991(08)80239-x

Cited by 5 publications

(7 citation statements)

References 2 publications

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“…The biggest difference in the US signal recorded during the synthesis of a MOF compared to the zeolite syntheses described in the former chapter is the exponential course compared to the frequently observed S-shaped curves for zeolite. Like for the UiO-66, the same exponential course was observed for HKUST-1 . This is probably because of the almost instant solid formation in MOF syntheses, whereas in zeolite synthesis an induction period exists (Figure ).…”

Section: Ultrasonic Diagnosticssupporting

confidence: 72%

“…Even though progress in the identification of PNBUs was made with in situ NMR spectroscopy or in situ IR and Raman spectroscopy, , US monitoring will definitely help to push the mechanistic understanding as it was already proven for zeolites. Here it should be emphasized that the example of the crystallization mechanism of UiO-66 demonstrates how many different techniques are necessary, whereas the examples reported by Schwieger and co-workers show that, at least for zeolites, all these steps can be observed with US in situ monitoring. − …”

Section: Ultrasonic Diagnosticsmentioning

confidence: 99%

“…Exemplary course of a damped US signal during the synthesis of zeolite A at a synthesis temperature of 95 °C (left) and HKUST-1 at a synthesis temperature of 100 °C (right) …”

Section: Ultrasonic Diagnosticsmentioning

confidence: 99%

“…Up to now, the in situ measured ultrasonic signals in sol−gel or colloidal (pure liquids) systems were accurately correlated to the increasing crystalline fraction of zeolite in the resulting solid products as determined by ex situ XRD measurement 61 or to the total amount in colloidal syntheses. 62 2.1. Methods.…”

Section: Ultrasonic Diagnosticsmentioning

confidence: 99%

“…Like for the UiO-66, the same exponential course was observed for HKUST-1. 62 This is probably because of the almost instant solid formation in MOF syntheses, whereas in zeolite synthesis an induction period exists (Figure 7).…”

Section: Synthesis Of Zeolitesmentioning

confidence: 99%

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Perspective on the Use of Ultrasonic Monitoring for In Situ Diagnostics of Zeolite and MOF Crystallization

Ermer

Reber

Baser

et al. 2023

Crystal Growth & Design

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The investigation and understanding of the underlying mechanisms for the crystallization of molecular sieve materials, such as metal–organic frameworks (MOFs) and zeolites, have received increasing interest in recent years. This is mainly because improvements of the corresponding equipment were made that are essential for in situ diagnostics. In contrast to classical techniques, such as X-ray diffraction and neutron scattering, nuclear magnetic resonance, or infrared and Raman spectroscopy, ultrasonic monitoring has not received proper attention. Thereby, especially for zeolites, important insights have been gained with this technique already. However, for MOFs, the number of publications dealing with in situ US monitoring is still limited. Therefore, this perspective gives an overview of the topic of in situ monitoring of crystallization of zeolites and MOFs and highlights the work that has been done so far by ultrasonic monitoring. Furthermore, we state benefits and current challenges for further establishing ultrasonic monitoring as a tool for the investigation of crystallization processes.

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Section: Ultrasonic Diagnosticssupporting

confidence: 72%

Section: Ultrasonic Diagnosticsmentioning

confidence: 99%

“…Exemplary course of a damped US signal during the synthesis of zeolite A at a synthesis temperature of 95 °C (left) and HKUST-1 at a synthesis temperature of 100 °C (right) …”

Section: Ultrasonic Diagnosticsmentioning

confidence: 99%

Section: Ultrasonic Diagnosticsmentioning

confidence: 99%

Section: Synthesis Of Zeolitesmentioning

confidence: 99%

See 3 more Smart Citations

Perspective on the Use of Ultrasonic Monitoring for In Situ Diagnostics of Zeolite and MOF Crystallization

Ermer

Reber

Baser

et al. 2023

Crystal Growth & Design

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In Situ Ultrasonic Measurements as a Tool to Characterize the Stages of the Zeolite A Crystallization Process

Baser,

Selvam,

Schwieger

et al. 2023

Chemie Ingenieur Technik

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Zeolite A (LTA) was synthesized at 80 °C under hydrothermal conditions from a gel with the molar composition of 2.5 Na2O : 2 SiO2 : Al2O3 : 80 H2O. In the present study, we report the use of home‐made ultrasound devices as a real‐time, in situ diagnostic tool for monitoring the progress of zeolite formation. In addition, the specific aim of this study was to show that the measured ultrasound parameters – ultrasonic (US) velocity and attenuation – simultaneously provide independent information about the changes in the liquid and solid phase, respectively, during the crystallization process. Both views are necessary for extracting kinetic data about the zeolite crystallization processes and allow elucidating the different stages of zeolite LTA formation process. The obtained in situ US data were compared with conventional ex situ powder X‐ray diffraction measurements following the formation of zeolite LTA from dense gels. The results demonstrate that a good correlation exists between the crystallization progress of zeolite LTA in terms of crystallinity changes and the ultrasonic attenuation and velocity.

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In-situ ultrasound study of the kinetics of formation of zeolites Na–A and Na–X from coal fly ash

Hums¹,

Musyoka

Baser

et al. 2014

Res Chem Intermed

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Ultrasonic monitoring of zeolite A and Metal Organic Frameworks (MOFs) formations: A comparative study

Cited by 5 publications

References 2 publications

Perspective on the Use of Ultrasonic Monitoring for In Situ Diagnostics of Zeolite and MOF Crystallization

Perspective on the Use of Ultrasonic Monitoring for In Situ Diagnostics of Zeolite and MOF Crystallization

In Situ Ultrasonic Measurements as a Tool to Characterize the Stages of the Zeolite A Crystallization Process

In-situ ultrasound study of the kinetics of formation of zeolites Na–A and Na–X from coal fly ash

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