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Molecules
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Zeolite and Zeolite-Like Nanoparticles: Synthesis, Properties and Applications
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Zeolite and Zeolite-Like Nanoparticles: Synthesis, Properties and Applications

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Materials Chemistry".

Deadline for manuscript submissions: 30 June 2024 | Viewed by 2018

Special Issue Editors

Dr. Eng-Poh Ng

E-Mail Website
Guest Editor
School of Chemical Sciences, Universiti Sains Malaysia, Penang 11800, Malaysia
Interests: catalysis; heterogeneous catalysts; nanoporous solids; nanomaterials; surface science; sustainable energy; biomass conversion
Special Issues, Collections and Topics in MDPI journals
Dr. Ka-Lun Wong

E-Mail Website
Guest Editor
1. School of Energy and Chemical Engineering, Xiamen University Malaysia, Jalan Sunsuria, Bandar Sunsuria, Sepang 43900, Selangor, Malaysia
2. College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
Interests: zeolite; heterogeneous catalysis; adsorption; separation; sustainable synthesis

Special Issue Information

Dear Colleagues,

Zeolites are crystalline microporous materials with well-defined channels and tunable cavities that enable shape-, size- and polarity-based molecular selectivity in various applications. Metal organic frameworks, also known as zeolite-like materials, share similar porous features with zeolites but possess larger pore sizes and more diverse frameworks constituted of inorganic building units and organic linkers. Recently, nanosized zeolite materials (particle size <100 nm in any dimension) have drawn much attention due to their increased external surface area, shorter diffusion pathlength, colloidal stability and unique electronic and optical properties. These nanoparticles have been applied in many novel applications, such as thin films, sensors, catalysts, adsorbents, optics, drug delivery carriers, etc. In this Special Issue, we welcome submissions on all aspects of zeolite and zeolite-like nanoparticles. In particular, we embrace manuscripts deepening our insights into the development of environmentally benign synthesis and modification methods, characterizations and development of advanced structured or multifunctional nanozeolite materials and interdisciplinary applications of nanozeolites. We hope that this Special Issue will bring together the latest research and development on this specific field for better advancement in the future.

Dr. Eng-Poh Ng
Dr. Ka-Lun Wong
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Molecules is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • zeolite
  • metal organic framework
  • nanocrystals
  • green synthesis
  • advanced applications
  • functionalization

Published Papers (2 papers)

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Research

15 pages, 3260 KiB  
Article
A Fine Analysis of Zn Species Structure and Distribution in Zn/ZSM-5 Catalysts by Linear Combination Fitting Analysis of XANES Spectra
by Baichao Li, Jie Gao, Jiabei Shao, Rui Geng, Zhangfeng Qin, Jianguo Wang, Weibin Fan and Mei Dong
Molecules 2024, 29(3), 631; https://doi.org/10.3390/molecules29030631 - 29 Jan 2024
Cited by 1 | Viewed by 658
Abstract
Investigating the distribution of different Zn species on Zn-containing zeolite catalysts is crucial for identifying the active sites and establishing the relationship between the catalyst’s structure and its activity in the process of ethylene aromatization. By utilizing X-ray absorption near edge spectra (XANES) [...] Read more.
Investigating the distribution of different Zn species on Zn-containing zeolite catalysts is crucial for identifying the active sites and establishing the relationship between the catalyst’s structure and its activity in the process of ethylene aromatization. By utilizing X-ray absorption near edge spectra (XANES) of various reference samples, this study employed linear combination fitting (LCF) analysis on XANES spectra of real samples to accurately measure the changes in the distribution of Zn species in Zn-containing HZSM-5 zeolites under different Zn sources and loadings. The results showed that ZnOH+, ZnO clusters, and ZnO crystalline structures coexist in Zn/HZSM-5 catalysts prepared through physical mixing and incipient wet impregnation methods. A similar trend was observed for catalysts prepared using different methods, with an increase in Zn content resulting in a decrease in the proportion of ZnOH+ and a significant increase in the amount of larger ZnO crystals. Furthermore, ZnO clusters were confined within the zeolite pores. The findings of this study established a direct correlation between the amount of ZnOH+ determined through LCF analysis and both the rate of hydrogen production and the rate of aromatics formation, providing strong evidence for the catalytic role of ZnOH+ as an active center for dehydrogenation, which plays a key role in promoting the formation of aromatics. The method of LCF analysis on XANES spectra allows for the determination of the local structure of Zn species, facilitating a more precise analysis based on the distribution of these species. This method not only provides detailed information about the Zn species but also enhances the accuracy of the overall analysis. Full article
(This article belongs to the Special Issue Zeolite and Zeolite-Like Nanoparticles: Synthesis, Properties and Applications)
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11 pages, 5094 KiB  
Article
Impact of Dye Encapsulation in ZIF-8 on CO2, Water, and Wet CO2 Sorption
by Aljaž Škrjanc, Mojca Opresnik, Matej Gabrijelčič, Andraž Šuligoj, Gregor Mali and Nataša Zabukovec Logar
Molecules 2023, 28(20), 7056; https://doi.org/10.3390/molecules28207056 - 12 Oct 2023
Cited by 1 | Viewed by 1029
Abstract
The fast adsorption kinetics of zeolitic imidazolate frameworks (ZIFs) enable a wide range of sorption applications. The most commonly used framework, ZIF-8, is relatively non-polar. Increasing the polarity of ZIF-8 through the encapsulation of different polar species shows promise for enhancing the sorption [...] Read more.
The fast adsorption kinetics of zeolitic imidazolate frameworks (ZIFs) enable a wide range of sorption applications. The most commonly used framework, ZIF-8, is relatively non-polar. Increasing the polarity of ZIF-8 through the encapsulation of different polar species shows promise for enhancing the sorption performance for pure CO2. Recently, the outlook has re-focused on gas mixtures, mostly in the context of post-combustion CO2 capture from wet flue gasses. While water is known to sometimes have a synergistic effect on CO2 sorption, we still face the potential problem of preferential water vapor adsorption. Herein, we report the preparation of three ZIF-8/organic dye (OD) composites using Congo red, Xylenol orange, and Bromothymol blue, and their impact on the sorption properties for CO2, water, and a model wet CO2 system at 50% RH. The results show that the preparation of OD composites can be a promising way to optimize adsorbents for single gasses, but further work is needed to find superior ZIF@OD for the selective sorption of CO2 from wet gas mixtures. Full article
(This article belongs to the Special Issue Zeolite and Zeolite-Like Nanoparticles: Synthesis, Properties and Applications)
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