Infrared spectroscopic and thermodynamic assessment of extraframework cationic adsorption sites in the zeolite K-L by using CO as probe molecule

Delgado, M.; Yuso, Alicia Martínez de; Bulánek, Roman

doi:10.1016/j.cplett.2015.09.028

Cited by 7 publications

(7 citation statements)

References 31 publications

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“…[20][21][22][23] High basicity and low size of ammonia molecule allow characterizing all acid sites independently on their nature, localization, and strength. Other experimental techniques are informative for evaluating the acid properties of the hydroxyl groups in zeolites, e.g., calorimetric measurements of simple probe molecules, 24 titration of the surface with Hammett indicators, 25,26 27 Al MAS NMR, [27][28][29] 13 C NMR chemical shis of adsorbed acetone, 30 FTIR spectroscopic studies, [31][32][33][34][35][36][37] ammonia infrared/mass spectroscopy (IRMS) temperature-programmed desorption (TPD). 38,39 Recently, large pore HBEA zeolites became a subject of numerous studies in catalysis.…”

Section: Introductionmentioning

confidence: 99%

Insight into the active site nature of zeolite H-BEA for liquid phase etherification of isobutylene with ethanol

et al. 2019

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Section: Introductionmentioning

confidence: 99%

Insight into the active site nature of zeolite H-BEA for liquid phase etherification of isobutylene with ethanol

et al. 2019

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“…This stimulated further systematic research. In the paradigmatic case of CO, the study of carbon monoxide molecule interactions with alkali metals and Mg 2+ , Ca 2+ , and Cu + cations coordinated in FER, − MFI, , BEA, LTA, FAU, and LTL zeolite frameworks showed that the existence and population of complexes formed in zeolites depend on (i) the zeolite topology, (ii) the concentration of the cations (determined by the Si/Al ratio), and (iii) the cation size. Studies extended to other gas molecules (such as CO 2 , NO, O 2 , N 2 , and acetylene ,− ,− ) have shown that the ability to form bridge complexes also depends on the size, geometry, and electronic structure of the molecules.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Theoretical Study of Propene Adsorption on K-FER Zeolites: New Evidence of Bridged Complex Formation

et al. 2018

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The interaction of propene with K-FER zeolites was investigated by a combination of IR spectroscopy, adsorption calorimetry, and theoretical study. Periodic density functional theory (DFT) calculations were performed using the DFT/CC scheme based on the Perdew–Burke–Ernzerhof density functional for the description of the interaction between propene and K-FER zeolites. On the basis of good agreement between experimental and theoretical results, three types of adsorption complexes were identified: (i) propene adsorbed on single K+ cation sites characterized by a νCC vibrational band at 1639 cm–1, (ii) propene bridging two nearby K+ cations in dual-cation sites represented in the IR spectra by a νCC vibrational band at 1633 cm–1, and (iii) propene molecules interacting with the zeolite framework mainly by dispersion interactions characterized by the νCC vibrational band at 1645 cm–1. The DFT calculations show that propene binds to the potassium cation via a cation−π interaction. The propene molecule adsorbed in the dual-cation site also exhibits the cation−π binding mode, and it is stabilized by 14 kJ/mol with respect to the adsorption complex at the isolated K+ cation site. The population of such bridged complexes increases with a decreasing Si/Al ratio. The knowledge of various types of adsorption complexes and their properties and parameters influencing their population is crucial for understanding the adsorption properties of zeolites as well as their ability to separate, purify, and store various gases, especially hydrocarbons.

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“…25, 1996.6, 2020, and 2166 cm À1 were observed in PVA and starch IR spectra which might be result from measuring conditions. 44 Figure 5(c) shows the FTIR of the Poly(PVA/St/Ag NPs) nanocomposite. Most of the observed peaks are similar to the peaks found in the spectra of PVA and St Only one new peak appeared at 1034.7 cm À1 for C-O-C stretching vibration.…”

Section: High-resolution Transmission Electron Microscopy (Hrtem)mentioning

confidence: 99%

Radiation preparation and antimicrobial activity of Poly(PVA/starch/Ag NPs) nanocomposite towards Penicillium digitatum on citrus fruits

Salah,

Salem,

Abdel-Ghaffar

et al. 2023

Journal of Thermoplastic Composite Materials

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The synthesis of Poly(PVA/St/Ag NPs) nanocomposite by using of gamma radiation was carried out. The progress of the reaction was examined by using different techniques such as Fourier transform infrared (FTIR), transmission electron microscopy (TEM), UV, XRD, and scanning electron microscopy (SEM). The FTIR show the successful preparation of the Poly(PVA/St/Ag NPs) nanocomposite by gamma radiation at a dose of 5 kGy. The TEM analysis displays the particle size distribution of Ag NPs and it is observed that the Ag NPs size was in the range of 21-30 nm. The SEM images show a good distribution of silver nanoparticles in the Poly(PVA/St/Ag NPs) nanocomposite. matrix, but with little agglomerations or aggregates observed on the surface of the Poly(PVA/St/Ag NPs) nanocomposite. The XRD analysis indicates that amorphous regions are enhanced in the Poly(PVA/St/Ag NPs) nanocomposite. The coating of Citrus fruits by of Poly(PVA/St/Ag NPs) nanocomposite showed better performance in inhibition of the growth of P. digitatum on citrus fruits than free Ag NPs at concentration of 30 ppm. The incorporation of Ag NPs in Poly(PVA/St/Ag NPs) nanocomposite has extremely obvious antifungal activities against P. digitatum due to the nanometer range of Ag NPs that can interact with P. digitatum surface and/or its core where it enters inside the cell, as a result, cellular metabolism is inhibited causing death of P. digitatum and subsequently exhibits antifungal activities.

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Infrared spectroscopic and thermodynamic assessment of extraframework cationic adsorption sites in the zeolite K-L by using CO as probe molecule

Cited by 7 publications

References 31 publications

Insight into the active site nature of zeolite H-BEA for liquid phase etherification of isobutylene with ethanol

Insight into the active site nature of zeolite H-BEA for liquid phase etherification of isobutylene with ethanol

Experimental and Theoretical Study of Propene Adsorption on K-FER Zeolites: New Evidence of Bridged Complex Formation

Radiation preparation and antimicrobial activity of Poly(PVA/starch/Ag NPs) nanocomposite towards Penicillium digitatum on citrus fruits

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