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Crystals
Special Issues
New Horizons in Zeolites and Zeolite-Like Materials
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New Horizons in Zeolites and Zeolite-Like Materials

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Hybrid and Composite Crystalline Materials".

Deadline for manuscript submissions: closed (1 June 2020) | Viewed by 28106

Special Issue Editor

Prof. Dr. Leonid Kustov

E-Mail Website
Guest Editor
1. N.D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prospect 47, 119991 Moscow, Russia
2. Chemistry Department, Moscow State University, Leninskie Gory 1, Bldg. 3, 119992 Moscow, Russia
3. Institute of Ecology and Engineering, National Science and Technology University MISiS, Leninsky Prospect 4, 119071 Moscow, Russia
Interests: catalysis; nanomaterials; renewables; green chemistry
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

It is a great pleasure for me to invite you to submit a manuscript to the Special Issue "New Horizons in Zeolites and Zeolite-Like Materials", which will be published in the journal Crystals.

This Special Issue targets interdisciplinary state-of-the-art research articles, communications, and reviews related to various aspects of the synthesis, characterization and application of zeolites and zeolite-like materials. Two rapidly developing vectors are currently emerging in this area: novel applications for the “old” systems (conventional zeolite) and fascinating hybrid zeolite-like materials, including diverse mesoporous materials (oxide-, carbon-, and polymer-based) and coordination polymers, such as metal organic frameworks (MOFs), covalent organic frameworks (COFs) and zeolitic imidazolate frameworks (ZIFs). All these materials exhibit a clear molecular sieve effect and extended micro/meso porosity. In some aspects, these newcomers are better or richer in properties and structures than the classical zeolites and provide more opportunities for variation of the structure and composition. The true zeolite nature of the newcomers in the zeolite world can be easily recognized from the shape-selectivity effects, huge specific surface areas and pore volumes, and typical zeolite architecture. Zeolite-like materials play a paramount role in contemporary research and practice. Advanced architectures provide a driving force for the progress in diverse research areas, including the development of new nano-engineered catalysts and adsorbents, smart and stimuli-responsive materials, sensors, as well as materials for energy applications (harvesting, storage). The incentive of this Special Issue is to show progress in key aspects of the broad “zeolite” arena. Combining individual contributions from these areas will allow us to produce the journal issue with a high impact. Thus, submissions focused on any new zeolite-like materials and their novel applications are cordially invited.

Please note that Crystals is an open access journal, and the whole Special Issue will be freely available for all readers across the world. Information about open access options and conditions is provided on the journal website.

Prof. Dr. Leonid Kustov
Guest Editor

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. Crystals is an international peer-reviewed open access monthly 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 2600 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-like materials
  • catalysis; adsorption
  • nanomaterials
  • hybrid materials
  • characterization of nanomaterials

Published Papers (6 papers)

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Editorial

Jump to: Research, Review

2 pages, 135 KiB  
Editorial
New Horizons in Zeolites and Zeolite-Like Materials
by Leonid Kustov
Crystals 2020, 10(8), 714; https://doi.org/10.3390/cryst10080714 - 18 Aug 2020
Cited by 1 | Viewed by 1836
Abstract
Zeolites have been known for about 250 years, though their active life in science and industry started in the late 1960s. [...] Full article
(This article belongs to the Special Issue New Horizons in Zeolites and Zeolite-Like Materials)

Research

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14 pages, 2374 KiB  
Article
Mechanical Properties of Geopolymers Synthesized from Fly Ash and Red Mud under Ambient Conditions
by Nevin Koshy, Kunga Dondrob, Liming Hu, Qingbo Wen and Jay N. Meegoda
Crystals 2019, 9(11), 572; https://doi.org/10.3390/cryst9110572 - 31 Oct 2019
Cited by 14 | Viewed by 3497
Abstract
Aluminosilicate gels form geopolymers and nanocrystalline zeolites which have comparable strength properties, making them a potential replacement for ordinary Portland cement. The study explores the use of two untreated industrial wastes, Class-F fly ash and red mud, for synthesizing geopolymeric material at ambient [...] Read more.
Aluminosilicate gels form geopolymers and nanocrystalline zeolites which have comparable strength properties, making them a potential replacement for ordinary Portland cement. The study explores the use of two untreated industrial wastes, Class-F fly ash and red mud, for synthesizing geopolymeric material at ambient synthesis conditions. The high alkalinity present in the red mud was exploited for the dissolution of silica in the fly ash and red mud. The mechanical, mineralogical, microstructural, and pore characteristics were analyzed and the contributions of curing period, Si/Al, Na/Al, and liquid-to-solid (L/S) ratios on the compressive strength of the end products were also investigated. The alkalinity of the system due to the red mud was adequate for the dissolution of raw fly ash and the subsequent formation of aluminosilicate gels. The strength of the end product was directly proportional to the initial Si/Al ratio and the specimens with highest fly ash content exhibited highest compressive strength values after 28 days of curing. Furthermore, fly ash contributed to the formation and distribution of interstitial and capillary pores in the aluminosilicate matrix. The lowest L/S ratio of the initial mix resulted in the end product with the highest unconfined compressive strength. Full article
(This article belongs to the Special Issue New Horizons in Zeolites and Zeolite-Like Materials)
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14 pages, 4520 KiB  
Article
Synthesis and Characterization of Crystalline NaY-Zeolite from Belitung Kaolin as Catalyst for n-Hexadecane Cracking
by Yuni K. Krisnandi, Indah R. Saragi, Riwandi Sihombing, Rizki Ekananda, Indah P. Sari, Benjamin E. Griffith and John V. Hanna
Crystals 2019, 9(8), 404; https://doi.org/10.3390/cryst9080404 - 04 Aug 2019
Cited by 18 | Viewed by 7194
Abstract
Crystalline sodium Y (NaY) zeolite has been synthesized using alternative natural source of aluminate and silicate, extracted from natural Belitung kaolin. Prior to use, the natural kaolin was pretreated to obtain fragmented metakaolin and extracted silica. Synthesis was conducted with the addition of [...] Read more.
Crystalline sodium Y (NaY) zeolite has been synthesized using alternative natural source of aluminate and silicate, extracted from natural Belitung kaolin. Prior to use, the natural kaolin was pretreated to obtain fragmented metakaolin and extracted silica. Synthesis was conducted with the addition of NaY gel (two types of NaY seeds were used, prepared from colloidal sillica or sodium silica water) using hydrothermal method for 21 h at 100 °C. The characterization on the as-synthesized zeolites confirmed that the one prepared using colloidal silica-seed has closer structure similarity to NaY zeolite that was synthesized using pro analysis silicate and aluminate sources. Thus, the rest of the synthesis of NaY was carried out using colloidal silica-NaY seed. The NaY zeolites then were converted to HY, through ammonium-exchange followed by calcination, to be tested as cracking catalysts using n-hexadecane as a probe molecule. It shows that HY from metakaolin and extracted silica gives high performance, i.e., n-hexadecane conversion of 58%–64%, also C5-C12 percentage yield and selectivity of 56%–62% and 98%. This work has shown the potential to utilize kaolin as alternative silicate aluminate sources for crystalline zeolite synthesis and to obtain inexpensive and environmentally friendly catalyst materials. Full article
(This article belongs to the Special Issue New Horizons in Zeolites and Zeolite-Like Materials)
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10 pages, 1823 KiB  
Article
First-Principles Study on Hydrogen Storage Performance of Transition Metal-Doped Zeolite Template Carbon
by Bai Han, Peng-Hao Lv, Wei-Feng Sun and Shu-Wei Song
Crystals 2019, 9(8), 397; https://doi.org/10.3390/cryst9080397 - 31 Jul 2019
Cited by 11 | Viewed by 3181
Abstract
The hydrogen adsorption characteristics and mechanism of transition metal-doped zeolite template carbon (ZTC) as a novel porous material are studied by theoretical calculations employing first-principle all-electron atomic orbital method based on density functional theory. The stability of transition metal atoms (Sc, Ti, and [...] Read more.
The hydrogen adsorption characteristics and mechanism of transition metal-doped zeolite template carbon (ZTC) as a novel porous material are studied by theoretical calculations employing first-principle all-electron atomic orbital method based on density functional theory. The stability of transition metal atoms (Sc, Ti, and V) decorated on zeolite template carbon is investigated by calculating the absorption binding energy. The adsorption configurations of the doped metal atom and adsorbed hydrogen are obtained from the energy functional minimization of first-principles calculations. The underlying mechanism for improving hydrogen storage performance of ZTC by doping transition metal atoms are explored through analyzing charge/spin populations of metal atoms in combination with the calculated results of hydrogen adsorption quantity and binding energy. To improve the hydrogen storage capability, the Sc, Ti, and V are individually introduced into the ZTC model according to the triplex axisymmetry. The hydrogen storage properties of ZTC decorated with different metal atoms are characterized by the adsorption energy and structure of several hydrogen atoms. The more energetically stable complex system with higher binding energy and adsorbing distance of hydrogen than lithium-doped ZTC can be achieved by doping Sc, Ti, V atoms in ZTC, which is expected to fulfill the substantial safe hydrogen storage by increasing hydrogen capacity with multi-sites doping of transition metal atoms. The present investigation provides a theoretical basis and predictions for the following experimental research and design of porous materials for hydrogen storage. Full article
(This article belongs to the Special Issue New Horizons in Zeolites and Zeolite-Like Materials)
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10 pages, 8011 KiB  
Article
Sustainable Route for Synthesis of All-Silica SOD Zeolite
by Hangling Zhai, Chaoqun Bian, Yuxia Yu, Longfeng Zhu, Lingfeng Guo, Xiao Wang, Qinqin Yu, Jie Zhu and Xuebo Cao
Crystals 2019, 9(7), 338; https://doi.org/10.3390/cryst9070338 - 30 Jun 2019
Cited by 9 | Viewed by 3564
Abstract
The development of the sustainable synthesis of zeolites has become a very hot topic in recent years. Herein, we report a sustainable route for synthesizing all-silica SOD zeolite under solvent-free conditions. The method of solvent-free synthesis includes mixing, grinding, and heating raw solids. [...] Read more.
The development of the sustainable synthesis of zeolites has become a very hot topic in recent years. Herein, we report a sustainable route for synthesizing all-silica SOD zeolite under solvent-free conditions. The method of solvent-free synthesis includes mixing, grinding, and heating raw solids. The all-silica SOD zeolite obtained was well characterized by multiple measurement techniques (XRD, SEM, IR, thermogravimetric-differential thermal analysis (TG-DTA), and magic angel spinning nuclear magnetic resonance (MAS NMR)). The crystallization process of all-silica SOD zeolite was also investigated in detail by XRD, SEM, UV-Raman, and MAS NMR techniques. In addition, the effects of the crystallization compositions, including the molar ratios of Na2O/SiO2 and ethylene glycol/SiO2, on the synthesis of the pure all-silica SOD zeolite were investigated at different temperatures. Full article
(This article belongs to the Special Issue New Horizons in Zeolites and Zeolite-Like Materials)
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Review

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19 pages, 2547 KiB  
Review
Implementing Metal-Organic Frameworks for Natural Gas Storage
by Eyas Mahmoud, Labeeb Ali, Asmaa El Sayah, Sara Awni Alkhatib, Hend Abdulsalam, Mouza Juma and Ala’a H. Al-Muhtaseb
Crystals 2019, 9(8), 406; https://doi.org/10.3390/cryst9080406 - 04 Aug 2019
Cited by 37 | Viewed by 7958
Abstract
Methane can be stored by metal-organic frameworks (MOFs). However, there remain challenges in the implementation of MOFs for adsorbed natural gas (ANG) systems. These challenges include thermal management, storage capacity losses due to MOF packing and densification, and natural gas impurities. In this [...] Read more.
Methane can be stored by metal-organic frameworks (MOFs). However, there remain challenges in the implementation of MOFs for adsorbed natural gas (ANG) systems. These challenges include thermal management, storage capacity losses due to MOF packing and densification, and natural gas impurities. In this review, we discuss discoveries about how MOFs can be designed to address these three challenges. For example, Fe(bdp) (bdp2− = 1,4-benzenedipyrazolate) was discovered to have intrinsic thermal management and released 41% less heat than HKUST-1 (HKUST = Hong Kong University of Science and Technology) during adsorption. Monolithic HKUST-1 was discovered to have a working capacity 259 cm3 (STP) cm−3 (STP = standard temperature and pressure equivalent volume of methane per volume of the adsorbent material: T = 273.15 K, P = 101.325 kPa), which is a 50% improvement over any other previously reported experimental value and virtually matches the 2012 Department of Energy (Department of Energy = DOE) target of 263 cm3 (STP) cm−3 after successful packing and densification. In the case of natural gas impurities, higher hydrocarbons and other molecules may poison or block active sites in MOFs, resulting in up to a 50% reduction of the deliverable energy. This reduction can be mitigated by pore engineering. Full article
(This article belongs to the Special Issue New Horizons in Zeolites and Zeolite-Like Materials)
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