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Journal articles on the topic 'Zeolit BEA'

Author: Grafiati

Published: 24 April 2022

Last updated: 30 July 2025

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1

Jendrlin, Martin, Julien Grand, Louwanda Lakiss, et al. "Environmental Applications of Zeolites: Hydrophobic Sn-BEA as a Selective Gas Sensor for Exhaust Fumes." Chemistry 5, no. 1 (2023): 334–47. http://dx.doi.org/10.3390/chemistry5010025.

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Environmental monitoring of pollutants, such as NOx and COx, which can be facilitated by a range of gas sensors, is of considerable fundamental and practical importance. This work has been focused on the synthesis and evaluation of zeolite β with tin (Sn-BEA) and dealuminated β (DeAl-BEA) zeolites. The zeolite samples have been extensively investigated by IR, UV-VIS and NMR spectroscopy, XRD, TGA, and N2 adsorption-desorption. The prepared Sn-BEA sample is characterised by the submicron particle size, an almost defect-free structure, and high hydrophobicity. Sensors containing selective microp

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2

Sobuś, Natalia, and Izabela Czekaj. "Comparison of Synthetic and Natural Zeolite Catalysts’ Behavior in the Production of Lactic Acid and Ethyl Lactate from Biomass-Derived Dihydroxyacetone." Catalysts 11, no. 8 (2021): 1006. http://dx.doi.org/10.3390/catal11081006.

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This article presents the results of the conversion of dihydroxyacetone (DHA) to lactic acid (LA) with the use of zeolite catalysts. For this purpose, synthetic zeolite beta (BEA) and natural clinoptilolite (CLI) were used as a matrix. The zeolites were modified with various metals (Sn, Fe, Cu and Zn) during ion exchange under hydrothermal conditions. The DHA conversion process with the participation of metal-functionalized zeolites allowed us to obtain intermediates, i.e., pyruvic aldehyde (PAL), which during the further reaction was transformed into a mixture of products such as ethyl lactat

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3

Soldatkin, О. О., V. M. Arkhypova, І. S. Kucherenko, D. Y. Kucherenko, and S. V. Dzyadevych. "ADAPTATION OF THE PROCEDURE OF CO-IMMOBILIZATION OF ENZYMES WITH DIFFERENT MODIFICATIONS OF ZEOLITES ON THE SURFACE OF CONDUCTOMETRIC TRANSDUCERS." Sensor Electronics and Microsystem Technologies 18, no. 4 (2021): 11–26. http://dx.doi.org/10.18524/1815-7459.2021.4.248177.

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A comparative study of different parameters of conductometric biosensors based on urease and glucose oxidase, co-immobilized with different types of zeolites. Urease immobilized on silicalite-2 was shown to have better performance than immobilized urease without zeolites. Conductometric biosensor with glucose oxidase co-immobilized with zeolite NH4+-Beta 25 had similar response values compared to immobilized enzyme without zeolite. Immobilization of zeolites NH4+-BEA 30 and H+-BEA 30 together with urease leads to an increase in the response of the biosensor, while the reproducibility of the si

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4

Putluru, Siva Sankar Reddy, Leonhard Schill, Anker Degn Jensen, and Rasmus S. N. Fehrmann. "Selective Catalytic Reduction of NOx with NH3 on Cu-, Fe-, and Mn-Zeolites Prepared by Impregnation: Comparison of Activity and Hydrothermal Stability." Journal of Chemistry 2018 (December 10, 2018): 1–11. http://dx.doi.org/10.1155/2018/8614747.

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Cu-, Fe-, and Mn-zeolite (SSZ-13, ZSM-5, and BEA) catalysts have been prepared by incipient wetness impregnation and characterized by N2 physisorption, H2-TPR, NH3-TPD, and XPS methods. Both metal and zeolite support influence the deNOx activity and hydrothermal stability. Cu-zeolites and Mn-zeolites showed medium temperature activity, and Fe zeolites showed high temperature activity. Among all the catalysts, Cu-SSZ-13 and Fe-BEA are the most promising hydrothermally resistant catalysts. Fresh and hydrothermally treated catalysts were further examined to investigate the acidic and redox proper

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5

Zhu, Longfeng, Jian Zhang, Liang Wang, et al. "Solvent-free synthesis of titanosilicate zeolites." Journal of Materials Chemistry A 3, no. 27 (2015): 14093–95. http://dx.doi.org/10.1039/c5ta02680f.

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Titanosilicate zeolites with MFI and *BEA structures are successfully synthesized using raw materials of fumed silica, titanium sulfate, organic templates, and zeolite seeds in the absence of solvents.

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6

Awala, Hussein, Elsa Leite, Loïc Saint-Marcel, et al. "Properties of methylene blue in the presence of zeolite nanoparticles." New Journal of Chemistry 40, no. 5 (2016): 4277–84. http://dx.doi.org/10.1039/c5nj02643a.

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7

Zhang, Jin, Talat Zakeri, Quidi Yue, et al. "Lewis acid zeolite catalysts via chemical modification of extra-large pore germanosilicates." Catalysis Today 440 (June 18, 2024): 114825. https://doi.org/10.5281/zenodo.12078452.

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Lewis acid zeolites containing tetravalent metals, such as Sn or Zr, are of great interest as catalysts for variousreactions owing to their tunability, activity, and reusability. In the context of emerging trends in biomass-relatedsubstrates processing, the synthesis of Lewis acid zeolites with extra-large pores presents a key step by addressingdiffusion restriction associated with these molecules. In this paper, we report on the incorporation of Sn and Zrinto extra-large pore zeolites UTL and *CTH through a four-step approach, including synthesis of parent germanosilicatezeolites, followed by

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8

Zhang, Jin, Talat Zakeri, Quidi Yue, et al. "Lewis acid zeolite catalysts via chemical modification of extra-large pore germanosilicates." Catalysis Today 440 (May 16, 2024): 114825. https://doi.org/10.5281/zenodo.13880101.

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Lewis acid zeolites containing tetravalent metals, such as Sn or Zr, are of great interest as catalysts for variousreactions owing to their tunability, activity, and reusability. In the context of emerging trends in biomass-relatedsubstrates processing, the synthesis of Lewis acid zeolites with extra-large pores presents a key step by addressingdiffusion restriction associated with these molecules. In this paper, we report on the incorporation of Sn and Zrinto extra-large pore zeolites UTL and *CTH through a four-step approach, including synthesis of parent germanosilicatezeolites, followed by

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9

Zhang, Jin, Talat Zakeri, Qiudi Yue, et al. "Lewis acid zeolite catalysts via chemical modification of extra-large pore germanosilicates." Catalysis Today 440 (May 16, 2024): 114825. https://doi.org/10.1016/j.cattod.2024.114825.

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Lewis acid zeolites containing tetravalent metals, such as Sn or Zr, are of great interest as catalysts for various reactions owing to their tunability, activity, and reusability. In the context of emerging trends in biomass-related substrates processing, the synthesis of Lewis acid zeolites with extra-large pores presents a key step by addressing diffusion restriction associated with these molecules. In this paper, we report on the incorporation of Sn and Zr into extra-large pore zeolites UTL and *CTH through a four-step approach, including synthesis of parent germanosilicate zeolites, follow

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10

Jendrlin, Martin, Julien Grand, Louwanda Lakiss, Philippe Bazin, Svetlana Mintova, and Vladimir Zholobenko. "Environmental Applications of Zeolites: Preparation and Screening of Cu-Modified Zeolites as Potential CO Sensors." Chemistry 5, no. 1 (2023): 314–33. http://dx.doi.org/10.3390/chemistry5010024.

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This work is focused on the application of Cu-containing zeolites as potential environmental sensors for monitoring carbon monoxide. A number of commercial zeolites with different structural properties (NaX, NaY, MOR, FER, BEA and ZSM-5) were modified using CuSO4, Cu(NO3)2 and Cu(OAc)2 solutions as copper sources to prepare Cu+-containing zeolites, since Cu+ forms stable complexes with CO at room temperature that can be monitored by infrared spectroscopy. Zeolite impregnation with Cu(NO3)2 resulted in the highest total Cu-loadings, while the Cu(OAc)2-treated samples had the highest Cu+/Cutotal

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11

Tomlinson, Sean R., Tyler McGown, John R. Schlup, and Jennifer L. Anthony. "Infrared Spectroscopic Characterization of CIT-6 and a Family of *BEA Zeolites." International Journal of Spectroscopy 2013 (October 24, 2013): 1–7. http://dx.doi.org/10.1155/2013/961404.

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Infrared spectroscopy is known to be a useful tool for identifying local structure changes in zeolites. Infrared spectroscopy is often employed to complement X-ray diffraction data. Local structure changes in zeolite CIT-6 and its zeolite beta (*BEA) analogs caused by calcination, altering framework composition, and ion exchange have been identified with mid- and far-infrared spectroscopy. Differences in the local structures of the samples were observed in mid- and far-infrared spectra, including changes in the intratetrahedral asymmetric stretch, the double-ring mode, and the intratetrahedral

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12

Al-Ani, Aqeel, Catia Freitas, and Vladimir Zholobenko. "Hierarchy in zeolite catalysis: The influence of enhanced mesoporosity on the synthesis of renewable fuels and bio-based platform chemicals." Journal of Petroleum Research and Studies 10, no. 4 (2020): 217–32. http://dx.doi.org/10.52716/jprs.v10i4.379.

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Faujasite (FAU), ZSM-5 (MFI), beta (BEA) and mordenite (MOR) zeolites were admitted to a variety of chemical treatments accompanied by surfactant templating strategy, aiming to introduce the intracrystalline mesoporosity effectively. The resulting materials were tested as solid acid catalysts for esterification of the oleic acid as a common model impurities found in bio-oil feedstoks. It was found that the esterification of oleic acid can be enhanced by the presence of strong acid sites in zeolites and their improved accessibility. Overall, mesostructured FAU zeolite demonstrated an improved c

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13

Jeong, Sangmin, Ki-Joon Jeon, Young-Kwon Park, Byung-Joo Kim, Kyong-Hwan Chung, and Sang-Chul Jung. "Catalytic Properties of Microporous Zeolite Catalysts in Synthesis of Isosorbide from Sorbitol by Dehydration." Catalysts 10, no. 2 (2020): 148. http://dx.doi.org/10.3390/catal10020148.

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As bisphenol A has been found to cause hormonal disturbances, the natural biomaterial isosorbide is emerging as a substitute. In this study, a method for isosorbide synthesis from sorbitol was proposed by dehydration under high temperature and high pressure reaction. Microporous zeolites and Amberlyst 35 solid acids with various acid strengths and pore characteristics were applied as catalysts. In the synthesis of isosorbide from sorbitol, the acidity of the catalyst was the main factor. MOR and MFI zeolite catalysts with high acid strength and small pore size showed low conversion of sorbitol

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14

Мараева, Евгения Владимировна, Саида Токмеилова, Диана Ралитовна Сагитова, Ирина Евгеньевна Кононова, Вячеслав Алексеевич Мошников, and Светлана Афанасьевна Скорникова. "STUDY ON THE MICROPOROUS STRUCTURE PARAMETERS OF BEA TYPE ZEOLITES." Physical and Chemical Aspects of the Study of Clusters, Nanostructures and Nanomaterials, no. 14 (December 15, 2022): 203–10. http://dx.doi.org/10.26456/pcascnn/2022.14.203.

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В работе рассматривается серия цеолитных материалов, применяемых в качестве катализаторов. Так как формирование мезопористости в микропористой матрице является одним из методов повышения эффективности цеолитных материалов в катализе, необходим контроль параметров их пористой структуры. Изучено влияние постсинтетической обработки растворами кислот и щелочей на удельную поверхность цеолитов типа BEA. Методом низкотемпературной (при 77 К) адсорбции паров азота определена внешняя удельная поверхность (без учёта микропор) и объем микропор в образцах на приборе Sorbi. Показано, что модифицирование ц

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15

Pranee, Watcharakorn, Pornsawan Assawasaengrat, Arthit Neramittagapong, Sasitorn Intarachit, and Sutasinee Neramittagapong. "Dimethyl Ether Synthesis via Methanol Dehydration over BEA Zeolite from Bagasse Fly Ash with Zircronium- and Nickel-Ion Exchange." Advanced Materials Research 931-932 (May 2014): 3–6. http://dx.doi.org/10.4028/www.scientific.net/amr.931-932.3.

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The synthesis of dimethyl ether via methanol dehydration has been carried out over Beta zeolite (BEA) and ion-exchanged Beta zeolite from bagasse fly ash using hydrothermal method. The reactions were taken place in a fixed-bed reactor. The effects of nickel and zirconium ion-exchanged of BEA were investigated. Ni-BEA zeolite exhibited high methanol conversion rate and DME-resultant upon the reaction temperature from 200 to 225°C with equilibrium-limiting condition over 225°C; Furthermore, the Ni-BEA zeolite presented the best stable activity at 225°C over 1,200 minute. The Ni-BEA zeolite has a

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16

Krysiak, Yaşar, Bastian Barton, Bernd Marler, Reinhard B. Neder, and Ute Kolb. "Ab initiostructure determination and quantitative disorder analysis on nanoparticles by electron diffraction tomography." Acta Crystallographica Section A Foundations and Advances 74, no. 2 (2018): 93–101. http://dx.doi.org/10.1107/s2053273317018277.

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Nanoscaled porous materials such as zeolites have attracted substantial attention in industry due to their catalytic activity, and their performance in sorption and separation processes. In order to understand the properties of such materials, current research focuses increasingly on the determination of structural features beyond the averaged crystal structure. Small particle sizes, various types of disorder and intergrown structures render the description of structures at atomic level by standard crystallographic methods difficult. This paper reports the characterization of a strongly disord

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17

Gil-Muñoz, Gema, Juan Alcañiz-Monge, and María José Illán-Gómez. "Analyzing the Effect of Zr, W, and V Isomorph Framework Substitution on ZSM-5 and Beta Zeolites for Their Use as Hydrocarbon Trap." Molecules 28, no. 12 (2023): 4729. http://dx.doi.org/10.3390/molecules28124729.

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This work evaluates the effect on the adsorption and desorption kinetics of propene and toluene (used as probe molecules for vehicle cold-start emissions) of the isomorph framework substitution of Zr, W, and V on commercial ZSM-5 and beta zeolites. TG-DTA and XRD characterization data indicated that: (i) Zr does not modify the crystalline structure of the parent zeolites, (ii) W develops a new crystalline phase, and (iii) V causes the breakdown of the zeolite structure during the aging step. The CO2 and N2 adsorption data revealed that the substituted zeolites present a narrower microporosity

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18

Bedenko, Stanislav P., Konstantin I. Dement’ev, and Valentin F. Tret’yakov. "Deactivation of Zeolite Catalysts in the Prins Reaction between Propene and Formaldehyde in the Liquid Phase." Catalysts 11, no. 10 (2021): 1181. http://dx.doi.org/10.3390/catal11101181.

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The Prins reaction between propene and formaldehyde was studied over H-BEA, H-FAU, H-MFI and H-MOR zeolites at 150 °C in liquid phase. It was found that the H-BEA sample is the most active and selective toward buta-1,3-diene; the H-MFI is a potential catalyst for 3-buten-1-ol synthesis, while H-FAU can be used for 4-methyl-1,3-dioxane production. It had been confirmed that zeolite textural and acidic properties influence catalyst behaviour: the acidic properties influence sample activity, while product distribution is controlled by pore volume and effective pore diameter. The sample’s deactiva

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19

Huseynova, Galina, Gulbeniz Мuхtаrоvа, Nushaba Aliyeva, Gular Gаsimоvа, and Sanubar Rаshidоvа. "Zeolite-Containing Catalysts in Alkylation Processes." Catalysis Research 2, no. 3 (2022): 1. http://dx.doi.org/10.21926/cr.2203019.

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This article provides an overview of zeolite-containing catalysts used in the alkylation of benzene and toluene with olefins, isobutane with butenes and butane-butene fractions, gasoline and oil fractions with olefins, propane-propylene, and butane-butylene fractions of catalytic cracking. Zeolites have various types of structures, including BEA, MFI, MWW, FAU, etc., which differ in pore size and the number and location of the channels. High-silica zeolites have a large pore volume, high acidity, good hydrothermal stability, and molecular sieve properties that provide high selectivity in alkyl

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20

Huseynova, G. A., G. S. Mukhtarova, S. Y. Rashidova, and G. A. Gasimova. "Zeolite-containing catalysts in alkylation processes." Azerbaijan Oil Industry, no. 10 (October 15, 2022): 41–46. http://dx.doi.org/10.37474/0365-8554/2022-10-41-46.

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The paper reviews the zeolite-containing catalysts applied in alkylation processes of benzole and tolene with olefines, isobutene with butenes and butane-butene fractions, gasoline and oil fractions with olefins, propane-propylene and butane-butylene fractions of catalytic cracking as well. The zeolites are presented with the structures of BEA, MFI, MWW, FAU etc. types differing with pore size, with quantity and location of the channels. High-silica zeolites are characterized with high volume of pores, high acidity, hydrothermal stability, as well as with shape-selective properties providing h

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21

Sobuś, Natalia, and Izabela Czekaj. "Catalytic Transformation of Biomass-Derived Glucose by One-Pot Method into Levulinic Acid over Na-BEA Zeolite." Processes 10, no. 2 (2022): 223. http://dx.doi.org/10.3390/pr10020223.

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This article presents the results of the conversion of biomass-based glucose to levulinic acid (LA) with the use of Na-BEA commercial zeolite catalyst. For this purpose, synthetic zeolite BEA was used as a matrix. The glucose conversion process with the participation of Na-BEA zeolite allowed the following acids to be obtained: levulinic acid, lactic acid, pyruvic acid and formic acid. The highest yield of levulinic acid was achieved when processed for 1–5 h at 200–250 °C with 0.1 g and 0.6 g of Na-BEA catalyst. We also compare the one-pot heterogeneous process with similar homogeneous process

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22

Bokarev, D. A., I. V. Paramoshin, A. V. Rassolov, S. A. Kanaev, G. O. Bragina, and A. Yu Stakheev. "Support Effect on the Characteristics of Mn Supported Catalysts in the O<sub>3</sub> Catalytic Oxidation of VOCs." Кинетика и катализ 64, no. 6 (2023): 811–21. http://dx.doi.org/10.31857/s0453881123060035.

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Catalytic characteristics of Mn-catalysts supported on different (SiO2 and BEA zeolite) were compared in the ozone decomposition and ozone-catalytic oxidation (OZCO) of VOCs using n-butane as the model compound. The parent SiO2 did not show any activity; therefore the characteristics of Mn/SiO2 are determined by the catalytic properties of the supported MnOx oxide. In contrast to SiO2, BEA zeolite demonstrates significant catalytic activity, though at a temperature by 50°C higher than Mn/BEA. The data obtained allow us to conclude that the catalytic characteristics of Mn/BEA at 30–100°C are de

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23

Chedryk, V. I., T. M. Boichuk, M. M. Kurmach, P. S. Yaremov, A. Yu Kapran та S. M. Orlyk. "Oxidative dehydrogenation of propane with the participation of mild oxidants (N2O and СО2) on metal(oxide)-zeolite catalysts". Catalysis and Petrochemistry, № 35 (2024): 1–10. https://doi.org/10.15407/kataliz2024.35.001.

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The paper presents the results of the study of textural and acidic characteristics of metal (oxide)-zeolite compositions M-BEA (MTW, MOR, ZSM-5) (М = Ga, Fe, Co, In) and their influence on catalytic properties in the oxidative dehydrogenation of propane to propylene with the participation of CO2 and N2O/ODP-СО2 (N2O). The ODP-N2O process was investigated on indium-, cobalt-, and iron-oxide compositions based on zeolites of structural types BEA, MOR, and ZSM-5 (H-form). The best indices of propylene production were achieved on the sample 10 %Fe2O3/HZSM-5 at the temperature 400 °С: the selectivi

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24

Chesnokov, Vladimir V., Pavel P. Dik, and Aleksandra S. Chichkan. "Formic Acid as a Hydrogen Donor for Catalytic Transformations of Tar." Energies 13, no. 17 (2020): 4515. http://dx.doi.org/10.3390/en13174515.

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Specific features of the catalytic tar cracking in the presence of formic acid, BEA zeolite and 8% Ni-2.5% Mo/Sibunit catalyst were studied at 350 °C and 1.0 MPa pressure. The obtained results evidenced that formic acid can be used as a hydrogen donor during catalytic reactions. The formic acid addition made it possible to perform efficient hydrocracking of heavy feed such as tar. It was found that both the tar conversion and selectivity to light (gasoline-diesel) fractions grew in the sequence: tar < (tar - formic acid) < (tar - formic acid - BEA zeolite) < (tar - formic acid - BEA z

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25

Maeno, Zen, Xiaopeng Wu, Shunsaku Yasumura, Takashi Toyao, Yasuharu Kanda, and Ken-ichi Shimizu. "In-Exchanged CHA Zeolites for Selective Dehydrogenation of Ethane: Characterization and Effect of Zeolite Framework Type." Catalysts 10, no. 7 (2020): 807. http://dx.doi.org/10.3390/catal10070807.

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In this study, the characterization of In-exchanged CHA zeolite (In-CHA (SiO2/Al2O3 = 22.3)) was conducted by in-situ X-ray diffraction (XRD) and ammonia temperature-programmed desorption (NH3-TPD). We also prepared other In-exchanged zeolites with different zeolite structures (In-MFI (SiO2/Al2O3 = 22.3), In-MOR (SiO2/Al2O3 = 20), and In-BEA (SiO2/Al2O3 = 25)) and different SiO2/Al2O3 ratios (In-CHA(Al-rich) (SiO2/Al2O3 = 13.7)). Their catalytic activities in nonoxidative ethane dehydrogenation were compared. Among the tested catalysts, In-CHA(Al-rich) provided the highest conversion. From kin

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26

Jonsson, Rasmus, Phuoc Hoang Ho, Aiyong Wang, Magnus Skoglundh, and Louise Olsson. "The Impact of Lanthanum and Zeolite Structure on Hydrocarbon Storage." Catalysts 11, no. 5 (2021): 635. http://dx.doi.org/10.3390/catal11050635.

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Hydrocarbon traps can be used to bridge the temperature gap from the cold start of a vehicle until the exhaust after-treatment catalyst has reached its operating temperature. In this work, we investigate the effect of zeolite structure (ZSM-5, BEA, SSZ-13) and the effect of La addition to H-BEA and H-ZSM-5 on the hydrocarbon storage capacity by temperature-programmed desorption and DRIFT spectroscopy. The results show that the presence of La has a significant effect on the adsorption characteristics of toluene on the BEA-supported La materials. A low loading of La onto zeolite BEA (2% La-BEA)

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27

Li, Yixiao, Quanhua Wang, Ding Wang, and Xiaoliang Yan. "NO-CH4-SCR Over Core-Shell MnH-Zeolite Composites." Applied Sciences 9, no. 9 (2019): 1773. http://dx.doi.org/10.3390/app9091773.

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Selective catalytic reduction of NO with methane (NO-CH4-SCR) in the presence of excess oxygen was investigated over the synthesized MnH-ZZs-n zeolite composite catalysts with FAU (as core) and BEA (as shell) topologies. XRD, SEM, and NH3-TPD technologies were employed to characterize the catalysts. It is found that the topological structure of the zeolite affected the catalytic properties and H2O/SO2 tolerances considerably. MnH-ZZs-n catalysts exhibited much higher NO-CH4-SCR activity than the physical mixture catalysts with comparable relative mass content of Y and Beta zeolites, particular

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28

Sharma, Shrinjay, Richard Baur, Marcello Rigutto, et al. "Computing Entropy for Long-Chain Alkanes Using Linear Regression: Application to Hydroisomerization." Entropy 26, no. 12 (2024): 1120. https://doi.org/10.3390/e26121120.

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Entropies for alkane isomers longer than C10 are computed using our recently developed linear regression model for thermochemical properties which is based on second-order group contributions. The computed entropies show excellent agreement with experimental data and data from Scott’s tables which are obtained from a statistical mechanics-based correlation. Entropy production and heat input are calculated for the hydroisomerization of C7 isomers in various zeolites (FAU-, ITQ-29-, BEA-, MEL-, MFI-, MTW-, and MRE-types) at 500 K at chemical equilibrium. Small variations in these properties are

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29

Julio, Colmenares-Zerpa, Márquez Génesis, Delgado Miguel, et al. "Evaluación del tiempo de cristalización en la preparación de la zeolita BEA por síntesis hidrotermal." Catálisis 9, no. 1 (2020): 36–41. https://doi.org/10.5281/zenodo.4087355.

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Se preparó una serie de materiales zeolíticos tipo BEA por síntesis hidrotermal variando el tiempo de cristalización, a partir de un gel con relación nominal Si/Al=25. Se empleó hidróxido de tetraetilamonio (TEAOH) como agente director de estructura (ADE). Los materiales se caracterizaron por Difracción de Rayos X en polvo (DRX), espectroscopía infrarroja con transformada de Fourier (IR-TF), Microscopía Electrónica de Barrido (MEB) y fisisorción de N2. Las bandas de los espectros IR-TF indican estructuras zeol&

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30

Cody, D., M. Moothanchery, E. Mihaylova, V. Toal, S. Mintova, and I. Naydenova. "Compositional Changes for Reduction of Polymerisation-Induced Shrinkage in Holographic Photopolymers." Advances in Materials Science and Engineering 2016 (2016): 1–11. http://dx.doi.org/10.1155/2016/8020754.

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Polymerisation-induced shrinkage is one of the main reasons why many photopolymer materials are not used for certain applications including holographic optical elements and holographic data storage. Here, two compositional changes for the reduction of shrinkage in an acrylamide-based photopolymer are reported. A holographic interferometric technique was used to study changes in the dynamics of the shrinkage processes occurring in the modified photopolymer during holographic recording in real time. Firstly, the effect of the replacement of the acrylamide monomer in the photopolymer composition

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31

Wu, Ruiqi, Ning Liu, Chengna Dai, et al. "Collaborative Purification of Tert-Butanol and N2O over Fe/Co-Zeolite Catalysts." International Journal of Environmental Research and Public Health 20, no. 6 (2023): 4902. http://dx.doi.org/10.3390/ijerph20064902.

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N2O is a greenhouse gas and a candidate oxidant. Volatile organic pollutants (VOCs) have caused great harm to the atmospheric ecological environment. Developing the technique utilizing N2O as the oxidant to oxidize VOCs to realize the collaborative purification has significant importance and practical value for N2O emission control and VOC abatement. Therefore, the study of N2O catalytic oxidation of tert-butanol based on zeolite catalysts was carried out. A series of molecular sieves, including FER, MOR, ZSM-5, Y, and BEA, were selected as the catalyst objects, and the 1.5% wt Fe and Co were,

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Hodala, Janardhan L., Anand B. Halgeri, and Ganapati V. Shanbhag. "Enhancement in activity and shape selectivity of zeolite BEA by phosphate treatment for 2-methoxynaphthalene acylation." RSC Advances 6, no. 93 (2016): 90579–86. http://dx.doi.org/10.1039/c6ra16093j.

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Selective and green synthesis of 2-acetyl-6-methoxynaphthalene (2,6MNAC) is studied. Phosphate impregnation in smaller quantity regulates the pore of zeolite BEA. High selectivity to 2,6MNAC over BEA is due to the shape-selective property enhanced by P modification.

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Villamaina, R., I. Nova, E. Tronconi, T. Maunula, and M. Keenan. "Effect of the NH4NO3 Addition on the Low-T NH3-SCR Performances of Individual and Combined Fe- and Cu-Zeolite Catalysts." Emission Control Science and Technology 5, no. 4 (2019): 290–96. http://dx.doi.org/10.1007/s40825-019-00140-3.

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Abstract We have measured NOx conversions and N2O productions over Fe-BEA and Cu-SAPO catalysts and over their sequential arrangements under Enhanced SCR conditions, resulting from the addition of an aqueous solution of ammonium nitrate (AN) to the typical Standard SCR feed stream, and we have compared them to those observed under Standard and Fast SCR conditions. The expected strong enhancement of the poor low temperature activity of the Fe-BEA catalyst was confirmed: both NH3 and NOx conversions and N2O formations similar to those of the Fast SCR reaction were achieved when cofeeding ammoniu

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Jonsson, Rasmus, Jungwon Woo, Magnus Skoglundh, and Louise Olsson. "Zeolite Beta Doped with La, Fe, and Pd as a Hydrocarbon Trap." Catalysts 10, no. 2 (2020): 173. http://dx.doi.org/10.3390/catal10020173.

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Hydrocarbon trapping is a technique of great relevance, since a substantial part of hydrocarbon emissions from engines are released from engines before the catalyst has reached the temperature for efficient conversion of the hydrocarbons. In this work, the influence of doping zeolite beta (BEA) with Fe, Pd, and La on the storage and release of propene and toluene is studied. Five monolith samples were prepared; Fe/BEA, La/BEA, Pd/BEA, Pd/Fe/BEA, and Pd/La/BEA using incipient wetness impregnation, and the corresponding powder samples were used for catalyst characterization by Inductively couple

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Gabla, Jenifer J., Sunil R. Mistry, and Kalpana C. Maheria. "An efficient green protocol for the synthesis of tetra-substituted imidazoles catalyzed by zeolite BEA: effect of surface acidity and polarity of zeolite." Catal. Sci. Technol. 7, no. 21 (2017): 5154–67. http://dx.doi.org/10.1039/c7cy01398a.

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Hlatywayo, Tapiwa, Leslie Petrik, and Benoit Louis. "Coal Fly Ash and Acid Mine Drainage-Based Fe-BEA Catalysts for the Friedel–Crafts Alkylation of Benzene." Catalysts 15, no. 2 (2025): 155. https://doi.org/10.3390/catal15020155.

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Coal fly ash and acid mine drainage are significant environmental issues in South Africa, causing storage constraints and impacting water quality. This study explores the use of coal fly ash and acid mine drainage in preparing zeolite HBEA-supported Fe catalysts. The Na-BEA parent catalysts were synthesised hydrothermally using coal fly ash as a feedstock. The Fe was loaded upon the H-BEA form zeolite using liquid-phase ion exchange or wet impregnation, using Fe-rich acid mine drainage as the metal precursor. The ion-exchanged Fe-BEA catalysts exhibited excellent activity, with the highest sel

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Bacariza, Carmen, Leila Karam, Nissrine El Hassan, José M. Lopes, and Carlos Henriques. "Carbon Dioxide Reforming of Methane over Nickel-Supported Zeolites: A Screening Study." Processes 10, no. 7 (2022): 1331. http://dx.doi.org/10.3390/pr10071331.

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As the utilization of zeolites has become more frequent in the dry reforming of methane (DRM) reaction, more systematic studies are required to evaluate properly the influence of zeolites’ composition and framework type on the performance. Therefore, in this work, a step-by-step study was performed with the aim of analyzing the effects of Ni loading (5, 10 or 15 wt.% over USY(3) zeolite), Si/Al ratio (3, 15 or 38 on USY zeolites with 15 wt.% Ni) and framework type (USY, BEA, ZSM-5 or MOR for 15 wt.% Ni and Si/Al ratios of ≈40) on catalysts’ properties and performances. Increasing Ni loadings e

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Nunes, Nelson, Ana P. Carvalho, Ruben Elvas-Leitão, et al. "Exploring the Effect of Hierarchical Porosity in BEA Zeolite in Friedel-Crafts Acylation of Furan and Benzofuran." Catalysts 12, no. 9 (2022): 1064. http://dx.doi.org/10.3390/catal12091064.

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Hierarchical BEA zeolite was prepared through desilication or desilication followed by acid treatment. The catalytic performance of BEA zeolite samples was evaluated using Friedel-Crafts acylations with two substrates of different molecular sizes, furan (5.7 Å) and benzofuran (6.9 Å), in the presence of acetic anhydride as acylating agent. The application of the simplified Langmuir-Hinshelwood kinetic model showed that the size of the substrate leads to different catalytic activities, with improved rate constant and turnover frequency (TOF) solely in the presence of benzofuran for both desilic

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Szkudlarek, Lukasz, Karolina A. Chalupka-Spiewak, Aleksandra Zimon, et al. "The Impact of Support and Reduction Temperature on the Catalytic Activity of Bimetallic Nickel-Zirconium Catalysts in the Hydrocracking Reaction of Algal Oil from Spirulina Platensis." Molecules 29, no. 22 (2024): 5380. http://dx.doi.org/10.3390/molecules29225380.

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The aim of this work was to investigate the hydrocracking of algae oil derived from Spirulina Platensis species catalyzed with bi-component nickel-zirconia catalysts supported onto different carriers (BEA, ZSM-5 and Al2O3) in an autoclave at 320 °C for 2 h with a hydrogen pressure of 75 bar. All catalysts were prepared using the wet co-impregnation method and were characterized by H2-TPR, XRD, NH3-TPD, BET and SEM-EDS. Before reactions, catalysts were calcined at 600 °C for 4 h in a muffle furnace, then reduced with 5%H2-95%Ar reducing mixture at 500 °C, 600 °C or 700 °C for 2 h. The obtained

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Chang, Chun-Chih, Hong Je Cho, Zhuopeng Wang, Xuanting Wang, and Wei Fan. "Fluoride-free synthesis of a Sn-BEA catalyst by dry gel conversion." Green Chemistry 17, no. 5 (2015): 2943–51. http://dx.doi.org/10.1039/c4gc02457e.

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A Sn-BEA catalyst was synthesized in a fluoride-free medium for the first time via a dry gel conversion method. The use of alkali ions, zeolite BEA seed crystals and ion-exchange before the removal of the organic template has been shown to be indispensable to obtain the desired material.

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Su, Hui, and Edward S. Yeung. "Combinatorial Study of Zeolites in Catalyzing the Acylation of Benzene via Laser-Induced Fluorescence Imaging." Applied Spectroscopy 56, no. 8 (2002): 1044–47. http://dx.doi.org/10.1366/000370202321274944.

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Laser-induced fluorescence imaging (LIFI) has been developed into a high-throughput screening (HTS) technique for heterogeneous catalysis. A laser beam is focused into a sheet parallel to the surface of the solid catalyst. Fluorescence from selected gaseous products formed immediately above the surface is imaged by a charge-coupled device (CCD) camera. Here, in situ LIFI was used to simultaneously screen the catalytic properties of a 15-member library consisting of mordenites (MOR), ferrierites (FER), ZSM-5 (MFI), zeolite γ-(gamma) (FAU), and beta zeolites (BEA) with various Si/Al ratios in th

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Luo, Yuying, Yadong Zhu, Jianguo Pan, and Xiaohui Chen. "Fast synthesis of hierarchical Al-free Ti-BEA plate-like nanocrystals from low-templated dry gel via a steam-assisted conversion method." Green Chemistry 22, no. 5 (2020): 1681–97. http://dx.doi.org/10.1039/c9gc03869h.

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Orlyk, Svitlana, Pavlo Kyriienko, Andriy Kapran, et al. "CO2-Assisted Dehydrogenation of Propane to Propene over Zn-BEA Zeolites: Impact of Acid–Base Characteristics on Catalytic Performance." Catalysts 13, no. 4 (2023): 681. http://dx.doi.org/10.3390/catal13040681.

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Research results about the influence of BEA zeolite preliminary dealumination on the acid–base characteristics and catalytic performance of 1% Zn-BEA compositions in propane dehydrogenation with CO2 are presented. The catalyst samples, prepared through a two-step post-synthesis procedure involving partial or complete dealumination of the BEA specimen followed by the introduction of Zn2+ cations into the T-positions of the zeolite framework, were characterized using XRD, XPS, MAS NMR, SEM/EDS, low-temperature N2 ad/desorption, C3H8/C3H6 (CO2, NH3)-TPD, TPO-O2, and FTIR-Py techniques. Full dealu

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Radhakrishnan, Sambhu, Sam Smet, C. Vinod Chandran, et al. "Prediction of Cu Zeolite NH3-SCR Activity from Variable Temperature 1H NMR Spectroscopy." Molecules 28, no. 18 (2023): 6456. http://dx.doi.org/10.3390/molecules28186456.

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Selective catalytic reduction (SCR) of NOx by ammonia is one of the dominant pollution abatement technologies for near-zero NOx emission diesel engines. A crucial step in the reduction of NOx to N2 with Cu zeolite NH3-SCR catalysts is the generation of a multi-electron donating active site, implying the permanent or transient dimerization of Cu ions. Cu atom mobility has been implicated by computational chemistry as a key factor in this process. This report demonstrates how variable temperature 1H NMR reveals the Cu induced generation of sharp 1H resonances associated with a low concentration

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Szkudlarek, Łukasz, Karolina Chałupka-Śpiewak, Waldemar Maniukiewicz, Magdalena Nowosielska, Małgorzata Iwona Szynkowska-Jóźwik, and Paweł Mierczyński. "Biodiesel Production by Methanolysis of Rapeseed Oil—Influence of SiO2/Al2O3 Ratio in BEA Zeolite Structure on Physicochemical and Catalytic Properties of Zeolite Systems with Alkaline Earth Oxides (MgO, CaO, SrO)." International Journal of Molecular Sciences 25, no. 7 (2024): 3570. http://dx.doi.org/10.3390/ijms25073570.

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Alkaline earth metal oxide (MgO, CaO, SrO) catalysts supported on BEA zeolite were prepared by a wet impregnation method and tested in the transesterification reaction of rapeseed oil with methanol towards the formation of biodiesel (FAMEs—fatty acid methyl esters). To assess the influence of the SiO2/Al2O3 ratio on the catalytic activity in the tested reaction, a BEA zeolite carrier material with different Si/Al ratios was used. The prepared catalysts were tested in the transesterification reaction at temperatures of 180 °C and 220 °C using a molar ratio of methanol/oil reagents of 9:1. The t

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Williams, C. Luke, Katherine P. Vinter, Chun-Chih Chang, et al. "Kinetic regimes in the tandem reactions of H-BEA catalyzed formation of p-xylene from dimethylfuran." Catalysis Science & Technology 6, no. 1 (2016): 178–87. http://dx.doi.org/10.1039/c5cy01320h.

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Ryzhikov, A., I. Khay, H. Nouali, T. J. Daou, and J. Patarin. "Drastic change of the intrusion–extrusion behavior of electrolyte solutions in pure silica *BEA-type zeolite." Phys. Chem. Chem. Phys. 16, no. 33 (2014): 17893–99. http://dx.doi.org/10.1039/c4cp01862a.

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Yakimov, Alexander V., Yury G. Kolyagin, Søren Tolborg, Peter N. R. Vennestrøm, and Irina I. Ivanova. "Accelerated synthesis of Sn-BEA in fluoride media: effect of H2O content in the gel." New Journal of Chemistry 40, no. 5 (2016): 4367–74. http://dx.doi.org/10.1039/c6nj00394j.

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Yang, Gang, Xiong Li, and Lijun Zhou. "Adsorption of fructose in Sn-BEA zeolite from periodic density functional calculations." RSC Advances 6, no. 11 (2016): 8838–47. http://dx.doi.org/10.1039/c5ra25554f.

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Andrade, Marta, Leonardo Ansari, Armando Pombeiro, Ana Carvalho, Angela Martins, and Luísa Martins. "Fe@Hierarchical BEA Zeolite Catalyst for MW-Assisted Alcohol Oxidation Reaction: A Greener Approach." Catalysts 10, no. 9 (2020): 1029. http://dx.doi.org/10.3390/catal10091029.

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The aim of this study was to investigate the catalytic activity of hybrid materials of iron supported on hierarchical zeolites in the oxidation reaction of 1-phenylethanol to acetophenone. A greener approach was considered for the preparation of the catalyst and performance of the oxidation reaction. Hierarchical BEA zeolite samples were obtained from an alkaline and a subsequent acid treatment. The materials were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and nitrogen adsorption at −196 °C. An iron salt was incorporated onto the hierarchical zeolites by m

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