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Zeolites and Porous Materials for Catalysis, Energy Transition and Adsorption...
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Zeolites and Porous Materials for Catalysis, Energy Transition and Adsorption Processes

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

Deadline for manuscript submissions: closed (29 February 2024) | Viewed by 4294

Special Issue Editors

Dr. Sichi Li

E-Mail Website
Guest Editor
Laboratory for Energy Applications for the Future (LEAF), Lawrence Livermore National Laboratory, Livermore, CA, USA
Interests: carbon capture; DeNOx; PNA; heterogeneous catalysis; computational chemistry
Prof. Dr. Wenfu Yan

E-Mail Website
Guest Editor
State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, China
Interests: synthesis and applications of zeolites; inorganic porous materials
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Zeolites and porous materials are important from both scientific and applied research points of view. The main applications of zeolites and mesoporous materials span such fields as heterogeneous catalysts in the petrochemical and other industries; water softening and purification; environmental pollution control; gas separation, purification and storage, i.e., carbon capture, and so on. Due to their importance and wide use, new advances in preparing zeolites are of constant interest. Additionally, zeolites and porous materials are also a very interesting subject of fundamental research due to their crystalline structure and well-defined structure.

This Special Issue aims to provide a range of selected contributions on both natural and synthetic zeolites, porous materials, and hierarchical systems for catalysis, energy transition, and adsorption processes. We strongly encourage researchers and scientists from academia and industry to submit their scientific work for this Special Issue. Full papers, communications, and reviews are all welcome.

Dr. Sichi Li
Prof. Dr. Wenfu Yan
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

  • synthetic zeolite
  • natural zeolite
  • hierarchical zeolite
  • synthesis
  • structure–property relationship
  • catalysis
  • gas separation
  • air pollution control
  • energy transition
  • adsorption

Published Papers (4 papers)

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Research

14 pages, 3310 KiB  
Article
Enhanced Adsorption of Trace Ethylene on Ag/NZ5 Modified with Ammonia: Hierarchical Structure and Metal Dispersion Effects
by Ying Qi, Huaming Yang, Chunli Li and Hao Li
Molecules 2024, 29(5), 981; https://doi.org/10.3390/molecules29050981 - 23 Feb 2024
Viewed by 451
Abstract
Trace ethylene poses a significant challenge during the storage and transportation of agricultural products, causing over-ripening, reducing shelf life, and leading to food waste. Zeolite-supported silver adsorbents show promise for efficiently removing trace ethylene. Herein, hierarchical Ag/NZ5(X) adsorbents were prepared via different ammonia [...] Read more.
Trace ethylene poses a significant challenge during the storage and transportation of agricultural products, causing over-ripening, reducing shelf life, and leading to food waste. Zeolite-supported silver adsorbents show promise for efficiently removing trace ethylene. Herein, hierarchical Ag/NZ5(X) adsorbents were prepared via different ammonia modifications, which featured enhanced ethylene adsorption ability. Ag/NZ5(2.5) exhibited the largest capacity and achieved near-complete removal at room temperature with prolonged efficacy. Characterization results indicated that the ammonia modification led to the formation of a hierarchical structure in the zeolite framework, reducing diffusion resistance and increasing the accessibility of the active sites. Additionally, desilication effects increased the defectiveness, generating a stronger metal–support interaction and resulting in a higher metal dispersion rate. These findings provide valuable insights into the development of efficient adsorbents for removing trace ethylene, thereby reducing food waste and extending the shelf life of agricultural products. Full article
(This article belongs to the Special Issue Zeolites and Porous Materials for Catalysis, Energy Transition and Adsorption Processes)
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33 pages, 2756 KiB  
Article
New Progress on London Dispersive Energy, Polar Surface Interactions, and Lewis’s Acid–Base Properties of Solid Surfaces
by Tayssir Hamieh
Molecules 2024, 29(5), 949; https://doi.org/10.3390/molecules29050949 - 21 Feb 2024
Cited by 1 | Viewed by 1083
Abstract
The determination of the polar surface free energy, polar properties, and Lewis’s acid base of solid materials is of capital importance in many industrial processes, such as adhesion, coatings, two-dimensional films, and adsorption phenomena. (1) Background: The physicochemical properties of many solid particles [...] Read more.
The determination of the polar surface free energy, polar properties, and Lewis’s acid base of solid materials is of capital importance in many industrial processes, such as adhesion, coatings, two-dimensional films, and adsorption phenomena. (1) Background: The physicochemical properties of many solid particles were characterized during the last forty years by using the retention time of injected well-known molecules into chromatographic columns containing the solid substrates to be characterized. The obtained net retention time of the solvents adsorbed on the solid, allowing the determination of the net retention volume directly correlated to the specific surface variables, dispersive, polar, and acid–base properties. (2) Methods: Many chromatographic methods were used to quantify the values of the different specific surface variables of the solids. However, one found a large deviation between the different results. In this paper, one proposed a new method based on the London dispersion equation that allowed the quantification of the polar free energy of adsorption, as well as the Lewis’s acid–base constants of many solid surfaces. (3) Results: The newly applied method allowed us to obtain the polar enthalpy and entropy of adsorption of polar model organic molecules on several solid substrates, such as silica, alumina, MgO, ZnO, Zn, TiO2, and carbon fibers. (4) Conclusions: our new method based on the separation between the dispersive and polar free surface energy allowed us to better characterize the solid materials. Full article
(This article belongs to the Special Issue Zeolites and Porous Materials for Catalysis, Energy Transition and Adsorption Processes)
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9 pages, 3165 KiB  
Article
Effect of Ion Size on Pressure-Induced Infiltration of a Zeolite-Based Nanofluidic System
by Yafei Zhang, Haitao Wang, Rui Luo and Yihua Dou
Molecules 2023, 28(16), 6013; https://doi.org/10.3390/molecules28166013 - 11 Aug 2023
Viewed by 756
Abstract
A nanofluidic system consists of a nano-porous medium and functional liquid, which demonstrates a higher energy absorption density compared to conventional systems for energy absorption. Alterations in the composition of the functional liquid can significantly impact the properties of a nanofluidic system. In [...] Read more.
A nanofluidic system consists of a nano-porous medium and functional liquid, which demonstrates a higher energy absorption density compared to conventional systems for energy absorption. Alterations in the composition of the functional liquid can significantly impact the properties of a nanofluidic system. In this paper, the widely used zeolite ZSM-5 was chosen as the porous medium to establish a nanofluidic system. Three distinct electrolyte solutions, namely KCl aqueous solutions, NaCl aqueous solutions and MgCl2 aqueous solutions were employed as functional liquids while pure water served as the reference condition for configuring four kinds of nanofluidic systems. Pressure-induced percolation experiments were performed on the four zeolite-based systems. The difference in the infiltration process between the electrolyte solution systems and the deionized water system has been ascertained. The effect of the ion size on the infiltration and defiltration process has been determined. The results show that the introduction of ions induces a hydration effect, resulting in a higher critical infiltration pressure of the electrolyte solution system compared to an aqueous solution system. The magnitude of cation charge directly correlates with the strength of the hydration effect and the corresponding increase in critical infiltration pressure. Upon entering the nanochannel, the liquid infiltrates primarily in the form of ions rather than a cation hydration form. The larger the ion size, the shallower the penetration depth after entering the nanopore channel and the larger the corresponding relative outflow rate. The present work will provide valuable theoretical complementary and experimental data support for nanofluidic system applications. Full article
(This article belongs to the Special Issue Zeolites and Porous Materials for Catalysis, Energy Transition and Adsorption Processes)
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23 pages, 10953 KiB  
Article
Fluoride Adsorption from Aqueous Solution by Modified Zeolite—Kinetic and Isotherm Studies
by Thouraya Turki, Abdelkader Hamdouni and Alexandru Enesca
Molecules 2023, 28(10), 4076; https://doi.org/10.3390/molecules28104076 - 13 May 2023
Cited by 1 | Viewed by 1634
Abstract
Fluorine is a very common element in the Earth’s crust and is present in the air, food, and in natural waters. It never meets in the free state in nature due to its high reactivity, and it comes in the form of fluorides. [...] Read more.
Fluorine is a very common element in the Earth’s crust and is present in the air, food, and in natural waters. It never meets in the free state in nature due to its high reactivity, and it comes in the form of fluorides. Depending on the concentration of fluorine absorbed, it may be beneficial or harmful to human health. Similar to any trace element, fluoride ion is beneficial for the human body at low levels, but as soon as its concentration becomes too high, it is toxic, inducing dental and bone fluorosis. The lowering of fluoride concentrations that exceed the recommended standards in drinking water is practiced in various ways around the world. The adsorption process has been classified as one of the most efficient methods for the removal of fluoride from water as it is environmentally friendly, easy to operate, and cost-effective. The present study deals with fluoride ion adsorption on modified zeolite. There are several influential parameters, such as zeolite particle size, stirring rate, solution pH, initial concentration of fluoride, contact time, and solution temperature. The maximum removal efficiency of the modified zeolite adsorbent was 94% at 5 mg/L fluoride initial concentration, pH 6.3, and 0.5 g modified zeolite mass. The adsorption rate increases accordingly with increases in the stirring rate and pH value and decreases when the initial fluoride concentration is increased. The evaluation was enhanced by the study of adsorption isotherms using the Langmuir and Freundlich models. The Langmuir isotherm corresponds with the experimental results of the fluoride ions adsorption with a correlation value of 0.994. The kinetic analysis results of the fluoride ions adsorption on modified zeolite allowed us to demonstrate that the process primarily follows a pseudo-second-order and then, in the next step, follows a pseudo-first-order model. Thermodynamic parameters were calculated, and the ΔG° value is found to be in the range of −0.266 kJ/mol up to 1.613 kJ/mol amidst an increase in temperature from 298.2 to 331.7 K. The negative values of the free enthalpy ΔG° mean that the adsorption of fluoride ions on the modified zeolite is spontaneous, and the positive value of the enthalpy ∆H° shows that the adsorption process is endothermic. The ∆S° values of entropy indicate the fluoride adsorption randomness characteristics at the zeolite-solution interface. Full article
(This article belongs to the Special Issue Zeolites and Porous Materials for Catalysis, Energy Transition and Adsorption Processes)
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