Analysis of theoretical and experimental X-ray diffraction patterns for distinct mordenite frameworks

Sánchez-López, Perla; Antúnez-García, Joel; Fuentes-Moyado, Sergio; Galván, D. H.; Petranovskii, Vitalii; Chavez-Rivas, F.

doi:10.1007/s10853-019-03407-w

Cited by 17 publications

(8 citation statements)

References 33 publications

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“…The characteristic peaks can be observed at 2θ = 13.4°, 15.3°, 19.7°, 22.3°, 25.7°, 26.4°, 27.8°, 31.0°, and 35.8°, which are associated with MOR, the Miller indices corresponding to these peaks are also marked [38]. Compared with H-MOR, the peak intensities of Ag-MOR at 19.7°, 22.3° and 25.7° are drastically attenuated, which was also found in other research [40]. These results indicate that MOR was sensitive to the addition of Ag during the ion exchange.…”

Section: Introductionsupporting

confidence: 79%

Silver-Modified Nano Mordenite for Carbonylation of Dimethyl Ether

Qian

et al. 2021

Catalysts

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Mordenite (H-MOR) catalysts were synthesized by a hydrothermal method, and silver-modified mordenite (Ag-MOR) catalysts were prepared by ion exchange with AgNO3 at different concentrations. The performance of these catalysts in the carbonylation of dimethyl ether (DME) to methyl acetate (MA) was also evaluated. The catalysts were characterized by Ar adsorption/desorption, XRD, ICP-AES, SEM, HRTEM, 27Al NMR, H2-TPR, NH3-TPD, Py-IR, and CO-TPD. According to the characterization results, Ag ion exchange sites were mainly located in the 8-membered ring (8-MR) channels of Ag-MOR; evenly dispersed Ag2O particles were also present. The acid site distribution was changed by the modification of Ag, and the amount of Brønsted acid sites increased in 8-MR and decreased in 12-MR. The CO adsorption performance of the catalyst significantly increased with the modification of Ag. These changes improved the conversion and selectivity of the carbonylation of DME. Over 4Ag-MOR in particular, DME conversion and MA selectivity reached 94% and 100%, respectively.

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Section: Introductionsupporting

confidence: 79%

Silver-Modified Nano Mordenite for Carbonylation of Dimethyl Ether

Qian

et al. 2021

Catalysts

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“…This indicates that Cu 2+ ions occupy similar cationic positions in the channels of mordenite, regardless of the exchange method used. A more detailed study of the structure is undoubtedly of interest, as it would provide valuable information on the local structure rearrangement caused by ion-exchange procedure, as it was observed in Ag- and Fe-exchanged mordenite [31], and its results will be published elsewhere.…”

Section: Discussionmentioning

confidence: 99%

Comprehensive Analysis of the Copper Exchange Implemented in Ammonia and Protonated Forms of Mordenite Using Microwave and Conventional Methods

et al. 2019

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This article presents the results of a comprehensive study of copper-exchanged mordenite samples prepared from its ammonia and protonated forms (Si/Al = 10) using two different ion exchange methods: conventional and microwave (MW)-assisted. The protonated H-MOR-10 sample was obtained by calcination of commercial NH4-MOR-10; in this case, a slight degradation of the mordenite framework was observed, but the resulting defects were partially restored after the first ion-exchange procedure of protons for copper ions. The level of copper exchange in the studied materials was found to be limited to 70%. Regardless of the exchange procedure, the replacement of ammonium or proton ions with copper led to a linear increase in the a/b ratio of cell parameters in accordance with an increase in the level of copper exchange, which means that all Cu2+ cations are ion-exchangeable and enter the main mordenite channel. Thermal analysis indicated a correlation between the replacement of various ammonium and hydroxyl groups by copper ions during the exchange treatment and their dehydroxylation energy during thermal decomposition. As a conclusion: MW-assisted treatment proved itself as an efficacious method for the synthesis of copper-exchanged mordenites, which not only significantly reduces preparation time but leads to a systematically higher copper exchange level.

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“…However, the variations of the relative intensities of several peaks were sensitive to Ag + and Zn 2+ incorporation, in particular the planes (111) at 6.3°, (220) at 10.3°, (311) at 12.1°, and (331) at 15.9° labeled with “@” (see Figure ). As reported previously, the relative intensity changes in the diffraction peaks of zeolite after the ion exchange process, especially with transition metals, are mainly associated with the changes in the local structure (exchange sites) of the zeolite. The latter allowed us to conclude the preferential location of the different metal cations.…”

Section: Resultsmentioning

confidence: 95%

“…The latter allowed us to conclude the preferential location of the different metal cations. Also, the variation in the intensity is strongly influenced by the metal charge on the support . Despite the light changes in the local structure, it may be concluded that the zeolite structure remains stable after ion exchange with Ag + and Zn 2+ cations because neither additional peaks nor any shift of characteristic signals was observed in the diffractograms.…”

Section: Resultsmentioning

confidence: 99%

Antimicrobial and Virus Adsorption Properties of Y-Zeolite Exchanged with Silver and Zinc Cations

Sánchez-López,

Hernández-Hernández,

Fuentes Moyado

et al. 2024

ACS Omega

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The antimicrobial activity of silver and zinc exchanged cations in Y-zeolite (Ag/CBV-600, Zn/CBV-600) is evaluated against Staphylococcus aureus (gram (+)) and Escherichia coli (gram (−)) bacteria along with their adsorption capacity for viruses: brome mosaic virus (BMV), cowpea chlorotic mottle virus (CCMV), and the bacteriophage MS2. The physicochemical properties of synthesized nanomaterials are characterized by inductively coupled plasma optical emission spectroscopy (ICP-OES), UV−Vis spectroscopy, X-ray diffraction (XRD), and scanning electron microscopy (SEM). According to the obtained results, the main species associated with the exchanged ions are Ag + and Zn 2+ cations with the concentration of around 1 atomic %. The incorporation of cations does not modify the Y-zeolite framework. The Ag/CBV-600 and Zn/CBV-600 materials show an inactivation of 90% for both gram (+) and gram (−) bacteria at 16 h at a relatively low concentration of nanomaterial (0.5 mg/mL). Moreover, the samples present good adsorption capacity for BMV, CCMV, and MS2 viruses showing adsorption higher than 40% after 2 h of interaction with the viruses. These prominent results allow the further usage of nanomaterials as an effective remedy to inhibit and reduce the spread of viruses such as SARS-CoV-2 or other gram (+) or gram (−) bacteria.

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Analysis of theoretical and experimental X-ray diffraction patterns for distinct mordenite frameworks

Cited by 17 publications

References 33 publications

Silver-Modified Nano Mordenite for Carbonylation of Dimethyl Ether

Silver-Modified Nano Mordenite for Carbonylation of Dimethyl Ether

Comprehensive Analysis of the Copper Exchange Implemented in Ammonia and Protonated Forms of Mordenite Using Microwave and Conventional Methods

Antimicrobial and Virus Adsorption Properties of Y-Zeolite Exchanged with Silver and Zinc Cations

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