The effect of chemical composition on the properties of LTA zeolite: A theoretical study

Antúnez-García, Joel; Galván, D. H.; Petranovskii, Vitalii; Murrieta-Rico, Fabián N.; Yocupicio-Gaxiola, Rosario I.; Shelyapina, Marina G.; Fuentes-Moyado, Sergio

doi:10.1016/j.commatsci.2021.110557

Cited by 18 publications

(8 citation statements)

References 74 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The excitation spectra exhibited a peak at 280 nm, which was consistent with the excitation spectrum of H + MOR (Si/Al = 7.9) at 77 K (Figure S3). The band gap of silica–alumina zeolites has been reported to be between 3 and 8 eV. − Therefore, the band gap of the MOR zeolite used in this study, estimated from the excitation–emission spectra (4.5–5 eV), was within the reported values. The excitation spectra and the emission spectra of both 2DA@MOR (Si/Al = 7.9) and H + MOR (Si/Al = 7.9) showed a broad peak at around 460 nm.…”

Section: Resultssupporting

confidence: 80%

Drastic Photoemission Color Alternation from a Single Molecule as a Starting Material Introduced in Acid-Treated Zeolites: From Pure Blue to White

Kishimoto,

Hisano,

Yoshioka

et al. 2023

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Since high-purity blue-and white-light emitters are an indispensable group of materials for the creation of nextgeneration optical devices, a number of light-emitting materials have been developed from both inorganic and organic synthetic chemistry. However, these synthetic chemical methods are far from the perspective of green chemistry due to the multistep synthetic process and the use of toxic reagents and elements. Herein, we demonstrate that the introduction of simple unsubstituted anthracenes into zeolite-like pores can create a wide variety of luminescent materials, from ultrapure blue luminescent materials (emission peak at 465 nm with a full width of half-maximum of 8.57 nm) to efficient white luminescent materials [CIE coordination at (0.31, 0.33) with a quantum efficiency of 11.0% under 350 nm excitation light]. The method for rational design of the luminescent materials consists of the following two key strategies: one is molecular orbital confinement of the anthracene molecules in the zeolite nanocavity for regulating the molecular coordination associated with photoexcitation and emission and the other is the interaction of unsubstituted anthracenes with extraframework aluminum species to stabilize the 2-dehydride anthracene cation in the zeolite cavity.

show abstract

Section: Resultssupporting

confidence: 80%

Drastic Photoemission Color Alternation from a Single Molecule as a Starting Material Introduced in Acid-Treated Zeolites: From Pure Blue to White

Kishimoto,

Hisano,

Yoshioka

et al. 2023

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

“…Incorporation of Al atoms and isomorphous incorporation of different metal atoms enables regulation of the type, location, concentration, and strength of acid sites. 47,48 This greatly enriches the zeolite family and has proven to be an important approach to tailor the properties of active sites in zeolites. According to one of the first theories of isomorphous substitution proposed by Pauling, isomorphous substitution generally occurs between atoms featuring similar nature of chemical bond and similar size in atomic radii.…”

Section: Framework and Framework-associated Metal Single Sitesmentioning

confidence: 99%

Metal Sites in Zeolites: Synthesis, Characterization, and Catalysis

2022

View full text Add to dashboard Cite

Zeolites with ordered microporous systems, distinct framework topologies, good spatial nanoconfinement effects, and superior (hydro)thermal stability are an ideal scaffold for planting diverse active metal species, including single sites, clusters, and nanoparticles in the framework and framework-associated sites and extra-framework positions, thus affording the metal-in-zeolite catalysts outstanding activity, unique shape selectivity, and enhanced stability and recyclability in the processes of Brønsted acid-, Lewis acid-, and extra-framework metal-catalyzed reactions. Especially, thanks to the advances in zeolite synthesis and characterization techniques in recent years, zeolite-confined extraframework metal catalysts (denoted as metal@zeolite composites) have experienced rapid development in heterogeneous catalysis, owing to the combination of the merits of both active metal sites and zeolite intrinsic properties. In this review, we will present the recent developments of synthesis strategies for incorporating and tailoring of active metal sites in zeolites and advanced characterization techniques for identification of the location, distribution, and coordination environment of metal species in zeolites. Furthermore, the catalytic applications of metal-in-zeolite catalysts are demonstrated, with an emphasis on the metal@zeolite composites in hydrogenation, dehydrogenation, and oxidation reactions. Finally, we point out the current challenges and future perspectives on precise synthesis, atomic level identification, and practical application of the metal-in-zeolite catalyst system.

show abstract

“…Natural zeolite is a mineral widely used to treat wastewater. For the dehydrated zeolite, its chemical formula is [Al 12 Si 12 O 48 ] 12− [129]. Its different specific characteristics (e.g., porosity, surface area, permeability, CEC) give it a very particular behavior [109,130,131].…”

Section: Zeolitementioning

confidence: 99%

Uses of Nanoclays and Adsorbents for Dye Recovery: A Textile Industry Review

et al. 2021

View full text Add to dashboard Cite

Wastewater recovery is one of the most pressing contaminant-related subjects in the textile industry. Many cleaning and recovery techniques have been applied in recent decades, from physical separation to chemical separation. This work reviews textile wastewater recovery by focusing on natural or synthetic nanoclays in order to compare their capabilities. Presently, a wide variety of nanoclays are available that can adsorb substances dissolved in water. This review summarizes and describes nanoclay modifications for different structures (laminar, tubular, etc.) to compare adsorption performance under the best conditions. This adsorbent capacity can be used in contaminant industries to recover water that can be used and be recontaminated during a second use to close the production circle. It explores and proposes future perspectives for the nanoclay hybrid compounds generated after certain cleaning steps. This is a critical review of works that have studied adsorption or desorption procedures for different nanoclay structures. Finally, it makes a future application proposal by taking into account the summarized pros and cons of each nanoclay. This work addresses contaminant reuse, where part of the employed dyes can be reused in printing or even dyeing processes, depending on the fixing capacity of the dye in the nanoclay, which is herein discussed.

show abstract

The effect of chemical composition on the properties of LTA zeolite: A theoretical study

Cited by 18 publications

References 74 publications

Drastic Photoemission Color Alternation from a Single Molecule as a Starting Material Introduced in Acid-Treated Zeolites: From Pure Blue to White

Drastic Photoemission Color Alternation from a Single Molecule as a Starting Material Introduced in Acid-Treated Zeolites: From Pure Blue to White

Metal Sites in Zeolites: Synthesis, Characterization, and Catalysis

Uses of Nanoclays and Adsorbents for Dye Recovery: A Textile Industry Review

Contact Info

Product

Resources

About