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Artículos de revistas sobre el tema "Zeolites characterization"

Autor: Grafiati

Publicado: 11 de enero de 2025

Última modificación: 31 de julio de 2025

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1

Elysabeth, Tiur, Zulnovri, Gina Ramayanti, Setiadi, and Slamet. "Modification of Lampung and Bayah Natural Zeolite to Enhance the Efficiency of Removal of Ammonia from Wastewater." Asian Journal of Chemistry 31, no. 4 (2019): 873–78. http://dx.doi.org/10.14233/ajchem.2019.21810.

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In this research, modification of Lampung and Bayah natural zeolites was carried out to increase the zeolite’s capacity as an ammonia adsorbent. Natural zeolite is modified by acid treatment using 6 M HCl and ion exchange using 1 M NH4NO3. The modification process continued with calcination at 500 °C for 4 h. X-ray fluorescence characterization shows changes in composition in the modified zeolites. The significant increase in the Si/Al ratio occurred in the modified zeolite with acid treatment that is 10.03 for Lampung natural zeolite HCl (LNZH) and 9.20 for Bayah natural zeolite HCl (BNZH). S

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2

Barbosa, Tellys Lins Almeida, and Meiry Gláucia Freire Rodrigues. "Synthesis of SAPO-34 Zeolite Membrane: Influence of Sources of Silica." Catalysis Research 03, no. 04 (2023): 1–19. http://dx.doi.org/10.21926/cr.2304030.

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The research described the production and characterization of various materials, particularly alpha-alumina ceramic supports, zeolite SAPO-34, and zeolite membranes. Ceramic supports were manufactured through dry uniaxial compaction. Sintering of the supports was carried out at 1300°C for 2 h. SAPO-34 zeolites and zeolite membranes were synthesized through a hydrothermal process involving two steps: a first step at 38°C for 24 h and a second step at 200°C for 24 h. The research aimed to determine how different silica sources, namely Aerosil 380, colloidal silica, and TEOS, influenced the outco

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3

Nuhu, A. A., Z. N. Garba, H. Ibrahim, and S. Abdulrazak. "Physicochemical Characterization of Zeolite Materials Produced from Selected Low-Cost Agricultural Wastes." Journal of Applied Sciences and Environmental Management 28, no. 3 (2024): 675–80. http://dx.doi.org/10.4314/jasem.v28i3.7.

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Zeolites play a crucial role in adsorption processes for eliminating pollutants from industrial effluents and are extensively utilized in catalytic activities across diverse syntheses. This study focused on the conversion of three agricultural wastes—corncob, groundnut shell, and sugarcane bagasse—into zeolitic materials through three analytical methods: hydrothermal, microwave sintering, and alkali fusion, respectively. Standard methods were employed to assess the physicochemical parameters of the resulting zeolites. Generally, the produced zeolites had excellent surface areas and porosities.

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4

Hakiki, Muhammad, Muhammad Makiyi, Nuryoto Nuryoto, Rahmayetty Rahmayetty, Indar Kustiningsih, and Teguh Kurniawan. "Pengaruh Lokasi Zeolit Alam Bayah terhadap Adsorpsi Amonium: Studi Kinetika dan Kesetimbangan." Jurnal Teknologi Lingkungan 22, no. 1 (2021): 018–28. http://dx.doi.org/10.29122/jtl.v22i1.4403.

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ABSTRACT Household waste is one of the most significant contributors to wastewater that can pollute the environment, one of which is ammonium pollution. Ammonium pollution can be reduced by natural zeolite by using the adsorption method. This research aims to utilize natural zeolite as an adsorbent that can reduce ammonium levels in wastewater, determine which natural zeolite has the most significant adsorption power from 4 locations, determine natural zeolite characterization of Bayah. This study is also to create a model equilibrium equations and reaction kinetics from the adsorption method.

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5

Reschetilowski, Wladimir. "Catalysis on Zeolites and Zeolite-like Materials II." Catalysts 14, no. 7 (2024): 460. http://dx.doi.org/10.3390/catal14070460.

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This Special Issue is a continuation of the previous successful Special Issue, “Catalysis on Zeolites and Zeolite-Like Materials”, which presented the latest developments and advances in the synthesis, characterization, and application of zeolites and zeolite-like materials as catalysts by renowned scientists [...]

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6

Intang, Ambo, Prahady Susmanto, Muhammad Djoni Bustan, and Sri Haryati. "Characterization of Natural Zeolite Synthesized by Dealumination and Desilication Method." Proceeding of the International Conference on Multidisciplinary Research for Sustainable Innovation 1 (August 12, 2024): 10–18. http://dx.doi.org/10.31098/icmrsi.v1i.778.

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Delamination and desilication are two methods used in the hierarchical synthesis of zeolites. This process is important for industrial applications, particularly in synthesizing natural zeolites due to their abundance. For instance, Lampung, Indonesia, has abundant natural zeolites. The synthesis process of natural zeolite can be simplified using the solvent swelling mechanism. The swelling solvent mechanism combines the dealumination and desilication methods into one process, making it advantageous to use natural zeolites as raw materials for manufacturing hierarchical zeolites on an industri

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7

Pan, M., P. A. Crozier, I. Y. Chan, and S. I. Zones. "High-resolution electron microscopy on SSZ-26 zeolite materials." Proceedings, annual meeting, Electron Microscopy Society of America 49 (August 1991): 1032–33. http://dx.doi.org/10.1017/s0424820100089470.

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Zeolites constitute an important class of catalyst materials in the petrochemical industry. Zeolites are aluminosilicates with their framework structures made up of SiO4 (or AlO4) tetrahedra. The catalytic properties such as selectivity and activity are closely related to the structure sensitive properties of zeolites, e.g. shape selectivity, diffusivity, etc. Understanding these properties requires detailed structure characterization of the zeolites. High resolution electron microscopy (HREM) has been successfully applied to solve some zeolite structures when combined with experimental data f

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8

Permanaputri, Salvira, and Cucuk Evi Lusiani. "ENHANCING ZEOLITE PERFORMANCE THROUGH AMINO MODIFICATION: A REVIEW OF METHODS AND CHARACTERIZATION." DISTILAT: Jurnal Teknologi Separasi 11, no. 1 (2025): 141–50. https://doi.org/10.33795/distilat.v11i1.6629.

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The increase in CO2 emissions in Indonesia is primarily attributed to the expansion of the economy and ongoing industrialization, primarily driven by the operation of fossil fuel power plants. It is imperative to implement strategies aimed at reducing CO2 emissions in the industrial sector in order to effectively address Indonesia's pollution problems. An effective method involves utilizing adsorbents, specifically zeolites, to capture and convert CO2 into valuable fuels. In order to improve the adsorption of CO2, the zeolite is chemically modified by adding amine groups. The objective of this

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9

Alsawalha, Murad. "Overview of Current and Future Perspectives of Saudi Arabian Natural Clinoptilolite Zeolite: A Case Review." Journal of Chemistry 2019 (March 3, 2019): 1–16. http://dx.doi.org/10.1155/2019/3153471.

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After a thorough review of existing studies of clinoptilolite zeolites, three areas for potential investigation of the Saudi Arabian zeolites were found. They are the characterizations, the catalytic activity, active sites, and uses of natural clinoptilolite zeolites. First, no analysis is available worldwide to compare the percentage weight of local zeolites with those sourced from other countries, nor does one exist for the establishment on the zeolite conversion of MBOH with water on acidic catalysts at lower temperatures. Secondly, a review of current literature on the topic revealed that

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10

Kamlesh Sahu. "STUDIES ON THE SYNTHESIS AND CHARACTERIZATION OF ZEOLITES AND THEIR APPLICATION AS A CATALYST." International Journal for Research Publication and Seminar 15, no. 3 (2024): 357–64. http://dx.doi.org/10.36676/jrps.v15.i3.1518.

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Because of their wide range of uses in catalysis, adsorption, and ion exchange, zeolites, which belong to the family of microporous aluminosilicate minerals, have garnered a lot of interest in recent years. The synthesis and characterisation of a variety of zeolites, as well as their potential application as catalysts in certain industrial processes, are the primary objectives of this research. Following the hydrothermal synthesis of various zeolite structures, such as ZSM-5, Y-zeolite, and Beta-zeolite, using a variety of templates and raw materials, followed by the structural and chemical ch

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11

Bux, Nabi, Sadam Hussain Tumrani, Razium Ali Soomro, and Xiaodong Ji. "Synthesis of Zeolites from Coal Fly Ash and Their Environmental Application." International Journal of Economic and Environmental Geology 13, no. 2 (2022): 58–61. https://doi.org/10.46660/ijeeg.vol13.iss2.2022.706.

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This study aims to make adsorption-capable zeolite from coal fly ash, a waste product from coal-fired power plants (CFA). When it comes to commercializing sorbent, the total cost and efficiency of the adsorbent material are critical. This work used tap water instead of distilled water (DW) to synthesis zeolite from fly ashes at 90°C crystallization temperatures. The discovery lays the door for a cost-effective but easy technique of synthesizing viable zeolitic materials for adsorption applications using waste products like coal fly ash. According to the comprehensive characterization, the supp

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12

Bux, Nabi, Sadam Hussain Tumrani, Razium Ali Soomro, and XiaodongJi. "Synthesis of Zeolites from Coal Fly Ash and Their Environmental Application." International Journal of Economic and Environmental Geology 13, no. 2 (2022): 58–61. http://dx.doi.org/10.46660/ijeeg.v13i2.32.

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This study aims to make adsorption-capable zeolite from coal fly ash, a waste product from coal-fired power plants (CFA). When it comes to commercializing sorbent, the total cost and efficiency of the adsorbent material are critical. This work used tap water instead of distilled water (DW) to synthesis zeolite from fly ashes at 90°C crystallization temperatures. The discovery lays the door for a cost-effective but easy technique of synthesizing viable zeolitic materials for adsorption applications using waste products like coal fly ash. According to the comprehensive characterization, the supp

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13

Hudec, P., J. Novanský, S. Silhár, T. N. Trung, M. Zúbek, and J. Maďar. "Possibility of Using t-Plots, Obtained from Nitrogen Adsorption for the Valuation of Zeolites." Adsorption Science & Technology 3, no. 3 (1986): 159–66. http://dx.doi.org/10.1177/026361748600300305.

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Data of adsorption isotherms of nitrogen adsorption at 77 K on various samples of zeolites were measured. Besides derivation of specific surface area by BET analysis, samples were characterised by values obtained by t-plots; specific surface areas of mesopores and specific volumes of micropores are also calculated. Results show the value of the use of t-plot method for the characterization of microporosity changes in zeolites after various treatments, and also for quantitative estimation of zeolite content in natural zeolites and the crystallinity of synthetic zeolites.

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14

Taba, Paulina, St Fauziah, Hasnah Natzir, et al. "Synthesis and characterization of zeolite obtained from Toraja natural montmorillonite." Journal of the Serbian Chemical Society, no. 00 (2025): 15. https://doi.org/10.2298/jsc241012015t.

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Zeolites are an alternative material for treating heavy metal-containing waste. Synthetic zeolites exhibit excellent purity and particle size uniformity, which has led many researchers to explore their synthesis, including the use of natural minerals. This study aims to synthesize zeolites using the hydrothermal method with aluminosilicate sources from Toraja natural minerals. Toraja natural minerals, primarily composed of montmorillonite, hydrothermally react with NaOH at varying concentrations to form analcime (ANA) and cancrinite (CAN) zeolites. The research also examined the reaction time

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15

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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16

Tawachkultanadilok, Pimrapus, Nattawut Osakoo, Chalermpan Keawkumay, et al. "Synthesis and Characterization of Zeolite NaY Dispersed on Bamboo Wood." Materials 16, no. 14 (2023): 4946. http://dx.doi.org/10.3390/ma16144946.

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Zeolites in powder form have the potential to agglomerate, lowering access to active sites. Furthermore, a suspension of fine zeolite powder in liquid media is difficult to separate. Such drawbacks could be improved by dispersing zeolite crystals on support materials. This work demonstrates the dispersion of zeolite NaY crystals on bamboo wood by mixing the wood with zeolite gel before hydrothermal treatment. The syntheses were performed with acid-refluxed and non–refluxed wood. The phase of zeolites, particle distribution and morphology, zeolite content in the wood, and zeolite–wood interacti

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17

Cadar, Oana, Irina Vagner, Ion Miu, Daniela Scurtu, and Marin Senila. "Preparation, Characterization, and Performance of Natural Zeolites as Alternative Materials for Beer Filtration." Materials 16, no. 5 (2023): 1914. http://dx.doi.org/10.3390/ma16051914.

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The clarity of the beer is essential to its marketability and good consumer approval. Moreover, the beer filtration aims to remove the unwanted constituents that cause beer haze formation. Natural zeolite, an inexpensive and widespread material, was tested as a substitute filter media for diatomaceous earth in removing the haze constituents in beer. The zeolitic tuff samples were collected from two quarries in Northern Romania: Chilioara, in which the zeolitic tuff has a clinoptilolite content of about 65%, and the Valea Pomilor quarry, containing zeolitic tuff with a clinoptilolite content of

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18

Solihat, Imas, Lilis Sulistiawaty, Putri Hawa Syaifie, and Agus Taufiq. "Removal of Cu Metals from Wastewater by Adsorption using Synthetic Zeolites from Rice Husk and Corncob." Molekul 15, no. 2 (2020): 105. http://dx.doi.org/10.20884/1.jm.2020.15.2.589.

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Heavy metals, such as Cu, are hazardous components so that it needs to reduce their concentration due to their negative impact on the environment. One method that can be used to reduce heavy metals in waste is to use adsorbents (synthetic zeolites). Utilization of agricultural waste such as rice husks and corncobs as precursors of synthetic zeolites will add economic value because it is relatively cheap with a lot of availability. This research aimed to find out new variants of synthetic zeolites, which can reduce the concentration of Cu in the adsorption process. The study consisted of 3 stag

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19

Coughlan, Brendan, and Mark A. Keane. "A characterization and catalytic study of Y zeolite supported Ni/Cu bimetallics." Canadian Journal of Chemistry 68, no. 9 (1990): 1471–76. http://dx.doi.org/10.1139/v90-225.

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A wide range of CuNiNaY andCuNiKY zeolites were prepared by ion exchange. The location of both Ni2+ and Cu2+ cations within the zeolite framework was monitored after various stages of thermal treatment and the reduction process of the transition metal ions in a flowing hydrogen atmosphere was investigated and correlated with reduction time and temperature. The metallic phase generated on reduction was characterized by X-ray diffraction line broadening. The catalytic activity of the reduced zeolites in the hydrogenation of benzene is discussed in the light of these physical characterizations.Ke

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20

Akinruli, Ifedayo Joshua, Seun Samuel Owoeye, Segun Michael Abegunde, Ayodeji E. Onipede, and Ukoba Kingsley. "Synthesis and Characterization of NaA Zeolite Using Natural Kaolinite Clays from Nigeria by Low Temperature Hydrothermal Method." International Journal of Research in Engineering, Science and Management 4, no. 2 (2021): 40–47. http://dx.doi.org/10.47607/ijresm.2021.498.

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Zeolites NaA is one of the most valuable synthetic zeolites widely used as ion-exchange material, catalysts, and adsorbents in industry. There is therefore need to adopt a more energy-efficient route for its synthesis from low-cost and sustainable raw materials. In this present work, zeolites Na-A was synthesized from natural kaolinite clays obtained from three selected regions (Ikere, Okpella and Kankara) in Nigeria. The as-received kaolinite clays (IKclay, OKclay and KAclay) were initially beneficiated thoroughly to obtain pure powders (˂75 μm). The processed kaolinite clay powders were then

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21

Kamal, Sanarya K., and Ammar S. Abbas. "Textural Properties Characterization for NaX and FeX Zeolites by Nitrogen Adsorption-desorption Technique." Iraqi Journal of Chemical and Petroleum Engineering 23, no. 4 (2022): 33–41. http://dx.doi.org/10.31699/ijcpe.2022.4.5.

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The zeolite's textural properties have a significant effect on zeolite's effectiveness in the different industrial processes. This research aimed to study the textual properties of the NaX and FeX zeolites using the nitrogen adsorption-desorption technique at a constant low temperature. According to the International Union of Pure and Applied Chemistry, the adsorption-desorption isotherm showed that the studied materials were mixed kinds I/II isotherms and H3 type hysteresis. The Brunauer-Emmett-Teller isotherm was the best model to describe the nitrogen adsorption-desorption better than the L

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22

Yee, Maxine, and Iskandar I. Yaacob. "Synthesis and Characterization of Iron Oxide Nanostructured Particles in Na–Y Zeolite Matrix." Journal of Materials Research 19, no. 3 (2004): 930–36. http://dx.doi.org/10.1557/jmr.2004.19.3.930.

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Formation of iron oxide nanoparticles within the internal cages of Na–Y zeolites was investigated. Sodium ions within the zeolites were replaced with iron(II) ions. Elemental composition studies showed a significant amount of iron in the exchanged sample. NaOH and dropwise additions of H2O2 at 60 °C triggered formation of zeolite–iron oxide systems. X-ray diffraction (XRD) patterns showed diminishing zeolite peaks along with evolution of peaks corresponding to γ-Fe2O3 and α-Fe2O3 with increasing NaOH concentration. Morphological changes from hexagonal-shaped zeolite to clusters of fine particl

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23

Gackowski, Mariusz, and Jerzy Datka. "Acid Properties of Hierarchical Zeolites Y." Molecules 25, no. 5 (2020): 1044. http://dx.doi.org/10.3390/molecules25051044.

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The article reviews different strategies towards obtaining mesoporous zeolites Y: desilication; surfactant templating and assembly of zeolite crystals. The impact of those methods on physicochemical properties is covered, with a special focus on the acidity of the samples measured with infrared (IR) spectroscopy. The methods of characterization of acidity are presented. Quaternary ammonium cations used for desilication lead to obtaining crystalline; mesoporous and highly acidic zeolites. Si-OH-Al groups of extremely high acidity can be produced by calcination in a humid atmosphere. When the co

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24

Jacob, Adikwu Gowon, Ikechukwu Ogadimma Alisi, and Jikamshi Mustapha Surajo. "KAOLINITE CLAY AS GREEN AND SUSTAINABLE RAW MATERIAL FOR ZEOLITES PRODUCTION: A REVIEW." FUDMA JOURNAL OF SCIENCES 9 (April 26, 2025): 18–35. https://doi.org/10.33003/fjs-2025-09(ahbsi)-3496.

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This review explored the potential of kaolinite clay as a green and sustainable raw material for the production of zeolites. Clay is a naturally abundant and inexpensive mineral, with unique properties that make it an ideal precursor for zeolite synthesis. The review discussed the properties and applications of clay minerals, as well as the preparations and applications of metakaolin, the thermally activated form of kaolinite clay. Furthermore, the review delved into the properties, structures, types, and methods of preparation of zeolites from metakaolin. Applications of zeolites in various f

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25

Kiradzhiyska, Denitsa, Tsvetelina Batsalova, Balik Dzhambazov, et al. "Synthesis, Characterization, and Cytotoxicity Evaluations of Silver–Zeolite Nanocomposite." Coatings 14, no. 6 (2024): 681. http://dx.doi.org/10.3390/coatings14060681.

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Zeolites of natural origin are materials exhibiting many positive effects on the human body. Silver-modified zeolites have already been introduced as bactericidal agents, although studies dealing with their toxicity are insufficient. This work describes the synthesis of activated and silver-loaded Bulgarian zeolite using a simple wet impregnation method. Morphological characteristics and compositions of natural zeolite, activated zeolite, and Ag-nanocomposites were studied by the X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) methods. Si

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Al Muhammadi, N. A. S., and A. Hussin. "Physical and mineral characterisation of natural zeolites from Taiz, South-western Yemen." Journal of Environmental Biology 42, no. 3(SI) (2021): 744–49. http://dx.doi.org/10.22438/jeb/42/3(si)/jeb-02.

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Aim: To investigate the physical, minerals and geochemical composition of Taiz natural zeolites. Methodology: Each zeolite sample were assessed for its characterization via optical microscopy, X-ray Diffraction (XRD) techniques, X-ray Fluorescence Methods (XRF), Inductively Coupled Plasma- Optical Emission Spectrometry (ICP-OES) to examine their mineral composition and geochemistry properties. Further, physical properties like pH, electrical conductivity (EC), plasticity, specific surface area, water content and brightness were estimated by standard methods. Results: Natural zeolite in the stu

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27

Ibsaine, Fatima, Dariush Azizi, Justine Dionne, et al. "Conversion of Aluminosilicate Residue Generated from Lithium Extraction Process to NaX Zeolite." Minerals 13, no. 12 (2023): 1467. http://dx.doi.org/10.3390/min13121467.

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The production of lithium from spodumene ores generates huge amounts of residues mainly composed of aluminosilicates. The main objective of the present study was to synthesize NaX zeolites with good ion-exchange capacity from these aluminosilicate residues, without using the fusion step or chemically modifying their initial Si/Al ratio. A physico-chemical (chemical composition, sorption capacity) and mineralogical (XRD, SEM) characterization of the zeolite synthesized using the conventional hydrothermal process (Process_1) was performed and compared with zeolite produced using a fusion step fo

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Gómez-Castillo, R., P. Del Angel-Vicente, and J. M. Domínguez-Esquivel. "High-resolution characterization of zeolites." Proceedings, annual meeting, Electron Microscopy Society of America 44 (August 1986): 778–79. http://dx.doi.org/10.1017/s0424820100145236.

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Structural variations such as microdefects, symmetry changes and crystalline intergrowths might influence the catalytic and chemisorptive properties of zeolites. Those variations occur at a very local scale, making it that traditional x-ray diffraction techniques are unsuitable to detect them. The alternative methods are high resolution electron microscopy and solid state- NMR.The HREM images obtained in the microscope are influenced by instabilites of the zeolite crystals, beam damage, electronoptical parameters and other dynamical interactions, which add each other to produce a rather comple

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An, Hyejin, Sungjoon Kweon, Sanggil Park, Jaeyoung Lee, Hyung-Ki Min, and Min Bum Park. "Immobilization of Radioiodine via an Interzeolite Transformation to Iodosodalite." Nanomaterials 10, no. 11 (2020): 2157. http://dx.doi.org/10.3390/nano10112157.

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We described a technology for immobilizing radioiodine in the sod-cages by the interzeolite transformation of iodine-containing LTA (zeolite A) and FAU (zeolites X and Y) into a sodalite (SOD) structure. The immobilization of iodine in the sod-cage was confirmed using diverse characterization methods including powder XRD, elemental analysis, SEM–EDS, 127I MAS NMR, and I 3d XPS. Although both zeolites A (Na-A) and X (Na-X) were well converted into SOD structure in the presence of NaI and AgI, the iodide anions were fixed in the sod-cages only when NaI was used. The ability to adsorb methyl iodi

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Mauer, Volker, Christian Bläker, Christoph Pasel, and Dieter Bathen. "Energetic Characterization of Faujasite Zeolites Using a Sensor Gas Calorimeter." Catalysts 11, no. 1 (2021): 98. http://dx.doi.org/10.3390/catal11010098.

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In addition to the adsorption mechanism, the heat released during exothermic adsorption influences the chemical reactions that follow during heterogeneous catalysis. Both steps depend on the structure and surface chemistry of the catalyst. An example of a typical catalyst is the faujasite zeolite. For faujasite zeolites, the influence of the Si/Al ratio and the number of Na+ and Ca2+ cations on the heat of adsorption was therefore investigated in a systematic study. A comparison between a NaX (Sodium type X faujasite) and a NaY (Sodium type Y faujasite) zeolite reveals that a higher Si/Al rati

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Zandbergen, H. W., and D. van Dyck. "High Resolution Electron Microscopy on zeolites." Proceedings, annual meeting, Electron Microscopy Society of America 48, no. 4 (1990): 290–91. http://dx.doi.org/10.1017/s0424820100174588.

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Zeolites are very suitable for high-resolution electron microscopical investigation since their pore structure often allows an unambiguous interpretation of the images, especially when taken with the electron beam parallel to one of the pore channel direction. HREM can give very useful information on a number of subjects of major importance in zeolite synthesis a.Nucleation;b.Defect characterization;c.Characterization of growth mechanisms of denser phases;d.Structure determination;e.Identification of small metal particles inside the zeolite matrix.f.Structural changes due to (catalytic) reacti

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32

Ruíz-Baltazar, Alvaro, Rodrigo Esparza, Maykel Gonzalez, Gerardo Rosas, and Ramiro Pérez. "Preparation and Characterization of Natural Zeolite Modified with Iron Nanoparticles." Journal of Nanomaterials 2015 (2015): 1–8. http://dx.doi.org/10.1155/2015/364763.

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This study is aimed at investigating the structural and morphological characterization of natural and modified zeolite obtained from the state of Oaxaca (Mexico). Iron nanoparticles were used for the zeolite modification. The iron nanoparticles were loaded on the zeolite surface by homogeneous nucleation. Adsorption kinetic models of pseudo first and second order were surveyed. The characterization of pristine and modified zeolite was performed by Fourier transform infrared (FTIR), transmission electron microscopy (TEM), and X-ray diffraction (XRD). From the results, three main phases were ide

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Zhou, Jian, Ni Zhang, Tao Meng, Qiangsheng Guo, Zhaoteng Xue, and Dongsen Mao. "Fluoride-Treated Nano-HZSM-5 Zeolite as a Highly Stable Catalyst for the Conversion of Bioethanol to Propylene." Nanomaterials 14, no. 19 (2024): 1558. http://dx.doi.org/10.3390/nano14191558.

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Fluoride treatment of ZSM-5 zeolite can effectively adjust surface acidity and generate a secondary pore structure. In this study, a series of modified nano-HZSM-5 zeolites were prepared by NH4F-HF mixed solution treatment and applied to the selective conversion of bioethanol to propylene at 500 °C, atmospheric pressure, and a WHSV of 10 h−1. The results showed that NH4F-HF modification weakened the surface acidity of nano-HZSM-5 zeolites, thus inhibiting coke formation. Additionally, the mesopores in the nano-HZSM-5 zeolites increased after NH4F-HF treatment, thereby enhancing the mass transf

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Padilla, Jessyka, and Verónica García. "Preparation and Characterization of ZSM-5 Zeolites Modified with Titanium and Iron by Direct Synthesis." MRS Proceedings 1765 (2015): 145–51. http://dx.doi.org/10.1557/opl.2015.821.

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ABSTRACTThe research for new energy sources has promoted hydrocarbon production from biomass and solid wastes over ZSM-5 zeolites. The metal incorporation by different methods has led to a variety of chemical applications. In this way, the combination of the shape selectivity and acidity properties of the pentasil zeolites with the activity of metal oxide under different environments may influence the product distribution in diverse catalytic reactions. In this work, ZSM-5 zeolites were prepared by hydrothermal synthesis employing aluminum nitrate and AIP as aluminium sources and TPAOH as stru

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Vokhmintsev, Andrei P. "Ektacytometry: Characterization of erythrocytes of residents of KhMAO-Yugra treated with natural zeolites." Izvestiya of Saratov University. Chemistry. Biology. Ecology 24, no. 4 (2024): 461–72. https://doi.org/10.18500/1816-9775-2024-24-4-461-472.

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The effect of a diet containing natural zeolite (clinoptilolite) on the deformability of red blood cells of volunteers of both sexes, of a wide age range living in KhMAO-Yugra (Khanty-Mansiysk), was studied. Natural zeolites, according to literature data, have antioxidant, membrane-protective and hematostimulating properties. It has been shown that the use of zeolite powder by volunteers for 30 days causes an increase in the erythrocyte deformability index (determined by laser diffractometry) compared to measurements taken before the start of the study. Such changes were the result of a signif

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Kasic, Vladan, Slavica Mihajlovic, Dragana Zivotic, et al. "Characterization of the zeolitic tuff from the “Igros-Vidojevici” deposit regarding geological and technological aspects." Chemical Industry 72, no. 1 (2018): 29–37. http://dx.doi.org/10.2298/hemind170428015k.

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This study presents investigations of zeolitic tuff samples from the ?Igros- -Vidojevici? deposit. The aim of the research was to determine the quality of samples taken from all deposit parts. Thus, samples were taken from the footwall (?Zeolit 1?), and four samples from the central deposit part (?Zeolit 2?, ?Zeolit 3?, ?Zeolit 4? and ?Zeolit 5?). Characterization of the samples included chemical analysis, determination of the adsorption coefficient for methylene blue dye and cation-exchange capacity (CEC), X-ray powder diffraction analysis (XRPD), differential thermal and thermogravimetric an

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Kurniawan, Teguh, Nuryoto, and Rahmayetty. "Characterization and Application of Bayah Natural Zeolites for Ammonium Capture: Isotherm and Kinetic." Materials Science Forum 988 (April 2020): 51–64. http://dx.doi.org/10.4028/www.scientific.net/msf.988.51.

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The aim of this study is to characterize Bayah natural zeolites and tested for ammonium capture. Characterization of Bayah natural zeolites were performed by X-ray diffraction (XRD), scanning electron microscope (SEM), and nitrogen physisorption. The natural zeolites were identified as mordenite and clinoptilolite. Non-zeolitic phase appeared on the XRD pattern was quartz. The morphology of clinoptilolite and mordenite were observed as platy and needle shape in the SEM images, respectively. Major cations were K+ and Ca2+ which were determined by energy dispersive X-ray. Nitrogen isotherm physi

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Purnamaningsih, Nur'aini, Endah Retnaningrum, and Wahyu Wilopo. "PEMANFATAAN KONSORSIUM BAKTERI PEREDUKSI SULFAT DAN ZEOLIT ALAM DALAM PENGENDAPAN LOGAM Mn." Jurnal Penelitian Saintek 22, no. 1 (2017): 37. http://dx.doi.org/10.21831/jps.v22i1.15311.

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Tujuan dari penelitian ini adalah untuk mengetahui pengaruh penambahan zeolit alam Wonosari terhadap aktivitas Bakteri Pereduksi Sulfat dalam pengendapan logam Mn skala continous culture dan mengidentifikasi karakter biofilm Bakteri Pereduksi Sulfat oleh aktivitas konsorsium Bakteri Pereduksi Sulfat pada zeolit alam dalam skala continous culture. Tahap penelitian meliputi aktivasi zeolit, pengujian aktivitas konsorsium Bakteri Pereduksi Sulfat dalam skala continous culture; serta karakterisasi biofilm konsorsium Bakteri Pereduksi Sulfat. Konsorsium Bakteri Pereduksi Sulfat yang digunakan beras

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39

Mukti, Rino R., Shofarul Wustoni, Agus Wahyudi, and Ismunandar Ismunandar. "CONVERSION OF THE LOW QUALITY INDONESIAN NATURALLY-OCCURRING MINERALS INTO SELECTIVE TYPE OF ZEOLITES BY SEED-ASSISTED SYNTHESIS METHOD." Indonesian Journal of Chemistry 13, no. 3 (2013): 278–82. http://dx.doi.org/10.22146/ijc.21288.

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An X-ray diffraction (XRD) revealed that Indonesian naturally-occurring mineral from Nanggung, Bogor shows to be a low quality product as it does not seem to contain any zeolite materials. As located in the volcanic area, Indonesia essentially has abundant source of natural zeolites and the country has put much efforts on these treasured materials for export commodity. In order to bring the local natural mineral into high value and to discover whether the mineral has at least zeolitic fragments, we have implemented seed-assisted synthesis to see the possibility of growing zeolite and turn this

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Wu, Jianbing, Sen Wang, Haitao Li, Yin Zhang, Ruiping Shi, and Yongxiang Zhao. "The Synergistic Effect of Acidic Properties and Channel Systems of Zeolites on the Synthesis of Polyoxymethylene Dimethyl Ethers from Dimethoxymethane and Trioxymethylene." Nanomaterials 9, no. 9 (2019): 1192. http://dx.doi.org/10.3390/nano9091192.

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A series of zeolites with different topology structures, including SAPO-34, SUZ-4, ZSM-5, USY, MOR, and beta, were used to synthesize polyoxymethylene dimethyl ethers (PODEn) from dimethoxymethane (DMM) and trioxymethylene (TOM). The influence of acidic properties and channel systems were studied by activity evaluation, characterization, and theoretical calculation. The results confirmed that pore mouth diameter larger than a TOM molecule was an essential prerequisite for the synthesis of PODEn over zeolites, and the synergistic effect between medium-strong Brønsted acid sites (Brønsted MAS) a

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41

Martinez-Ortigosa, Joaquin, Jorge Simancas, Jose A. Vidal-Moya, Fernando Rey, Susana Valencia, and Teresa Blasco. "A Multi-Nuclear MAS-NMR Study on the Structural Properties of Silicalite-1 Zeolite Synthesized Using N- and P-Based Organic Structure Directing Agents." Applied Sciences 11, no. 15 (2021): 6850. http://dx.doi.org/10.3390/app11156850.

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The nature of organic structure directing agents (OSDAs) is of paramount importance in the final properties of zeolites, particularly the framework and porosity. Recently, the use of P-containing OSDAs has been employed for new zeolites, but there is little discussion compared to their analogues N-OSDAs. The main objective of this work is the characterization of pure silica MFI zeolite (silicalite-1) prepared by the dual-template route with tetrapropylammonium (TPA), tetrapropylphosphonium (TPP) cations, and mixtures thereof aiming to understand by advanced NMR methods how the nature of the or

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42

Bakalár, Tomáš, Henrieta Pavolová, Kamil Kyšeľa, and Zuzana Hajduová. "Characterization of Cu(II) and Zn(II) Sorption onto Zeolite." Crystals 12, no. 7 (2022): 908. http://dx.doi.org/10.3390/cryst12070908.

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In this study, a batch sorption study approach was combined with an instrumental analytical approach of atomic absorption spectroscopy, X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) for the sorption of copper and zinc ions from aqueous solution on zeolites. Both copper and zinc are biogenic elements; nevertheless, many industrial processes produce an excessive amount, which is why their efficient removal from water must be studied. Two types of zeolites, Zeolite Micro 20 (Z-M20) and Zeolite Micro 50 (Z-M50), were used. The results showed that the maximum sorption capacitie

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Pathak, Dhanju Mani, Pankaj Kumar Ghosh, Kishor Kr Shah, and Anup Kumar Talukdar. "Synthesis and Characterization of Architecturally Modified Mesoporous-Microporous MFI (Mobil Five) Zeolite with Enhanced Catalytic Activity." Asian Journal of Chemistry 33, no. 10 (2021): 2430–38. http://dx.doi.org/10.14233/ajchem.2021.23352.

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Four samples of MFI zeolites with silica to alumina ratio of 100 and using different silica to carbon mass ratios (1:1, 1:4, 1:8 and 1:12) were synthesized by using carbon black particles. Silica-alumina molar ratio imposes the framework structure to the synthesized zeolites. In general with an increase in the silica-alumina molar gel ratio, the thermal stability, acid resistance and hydrophobicity of the product increases and ion-exchange capacity decreases. A higher molar ratio (as high as 100) of silica to alumina is considered. ZSM-5 zeolites being mainly microporous, their use as catalyst

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Ren, Tieqiang, Yue Sun, Yujia Wang, et al. "Regulation of TS-1 Zeolite with Small Particle Size by Colloidal Silicon Seed-Induced Synthesis and Application in Oxidative Desulfurization." Materials 17, no. 23 (2024): 5722. http://dx.doi.org/10.3390/ma17235722.

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The dosages of colloidal silicon seeds in the seed-induced synthesis of TS-1 zeolites were investigated in detail. The characterization results revealed that the colloidal silicon seeds not only reduced the particle sizes but also promoted the incorporation of titanium atoms into the framework of TS-1 zeolites as prepared. SEM images and particle size distribution (PSD) confirmed that the particle sizes of TS-1 zeolite could be effectively reduced to about 150 nm. The lattice plane [2 1 0] and [0 2 0] of 7.0-Seed-TS-1 zeolite were well exposed, as observed by the HRTEM images. It is worth noti

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45

Vavouraki, Aikaterini, Georgios Bartzas, and Konstantinos Komnitsas. "Synthesis of Zeolites from Greek Fly Ash and Assessment of Their Copper Removal Capacity." Minerals 10, no. 10 (2020): 844. http://dx.doi.org/10.3390/min10100844.

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The objective of this study was to synthesize zeolites through fusion of lignite fly ash and NaOH or KOH pellets at 600 °C and assess their removal efficiency in terms of decontamination of solutions containing Cu(II) ions. The removal efficiency of the produced zeolites was tested in batch kinetic experiments using different zeolites and Cu(II) ion concentrations. Experimental data revealed that zeolites synthesized with the use of NaOH exhibited higher removal efficiency compared with those synthesized with the use of KOH. Kinetic data showed that the pseudo-second-order equations described

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46

NAKATA, Shin-ichi, Sachio ASAOKA, and Hiromitsu TAKAHASHI. "Characterization of zeolites. V. Special articles on zeolite chemistry and technology. Characterization of zeolites by 23Na-MAS-NMR." NIPPON KAGAKU KAISHI, no. 3 (1989): 393–97. http://dx.doi.org/10.1246/nikkashi.1989.393.

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Peng, Gong Ming, De Lian Yi, Lin Wu, Zhao Hui Ou Yang, and Jian Guo Wang. "Novel Base Catalysts by Nitridation of Zeolite Y: Characterization and Catalytic Evaluation." Advanced Materials Research 148-149 (October 2010): 1096–99. http://dx.doi.org/10.4028/www.scientific.net/amr.148-149.1096.

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Novel base catalysts were obtained by subjecting Y zeolites to nitridation. These materials were characterized by elemental analysis, X-ray diffraction, BET surface area analysis, In situ diffuse reflectance infrared fourier transform Spectroscopy (in situ DRIFTS), Pyrrole adsorption. The results indicated nitrogen-incorporated NaY zeolite was well ordered and possess high surface area and pore volume. In situ DRIFTS experiments confirmed that N atoms had been introduced into the framework by nitridation to form -NH2- or -NH- species. It was found that Lewis basicity of these oxynitride materi

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48

Stojkić, Ognjen, Radislav Filipović, Mladen Janković, et al. "Influence of process parameters on the adsorption properties of zeolite 13X." Journal of Chemists, Technologists and Environmentalists 5, no. 1 (2024): 20–31. https://doi.org/10.59919/jcte05202401005.

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&lt;p&gt;Zeolite 13X is one of the best adsorbents among zeolites and one of the most commercially available zeolites.&amp;nbsp; This paper investigates the influence of several process parameters on the properties of 13X zeolite, including crystallization temperature, crystallization duration and Si/Al molar ratio in the starting reaction mixture. The quality of the obtained powders was examined in detail through a series of analytical and instrumental methods, presented in the paper. Water and CO&lt;sub&gt;2&lt;/sub&gt; adsorption capacities were determined as key

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M. Ibrahim, Jamal Eldin F., Emese Kurovics, Mohammed Tihtih, László A. Gömze, and István Kocserha. "Synthesis and characterization of alkali-activated zeolite-poor rocks." Journal of Physics: Conference Series 2315, no. 1 (2022): 012020. http://dx.doi.org/10.1088/1742-6596/2315/1/012020.

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Abstract Zeolite-geopolymer composite materials were obtained through mechanical activation using planetary ball mill followed by chemical activation using an aqueous solution of sodium hydroxide (NaOH), these materials integrate the beneficial features of both zeolites and geopolymers. In this present work, the morphological characteristics, microstructure, phase determination of raw materials and the generated ceramic samples were studied by several characterization methods such as SEM, EDS and XRD. The microstructural analysis confirms the formation of needle-like structure in sub-micron an

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Dimitrijevic, Radovan, та Vera Dondur. "Thermally induced conversion of Mg2+ cation exchanged LTA, FAU, GIS and SOD zeolites: Syntheses and characterization of γ-cordierite, a new Mg2Al4Si5O18 polymorph". Journal of the Serbian Chemical Society 72, № 12 (2007): 1351–62. http://dx.doi.org/10.2298/jsc0712351d.

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The thermal behaviours of fully Mg2+ cation exchanged LTA, FAU (X and Y species), GIS and SOD zeolites were investigated in the temperature range from ambient to 1400 ?C. The initial zeolite frameworks collapsed into amorphous intermediate substances after air heating between 800-850 ?C. Prolonged annealing of these products above 850 ?C induced recrystallization into sapphirine-like phases (Mg-LTA and Mg-FAUx zeolites) and ?-cordierite (Mg-FAUy and Mg-GIS zeolites) phases. These phases were unstable during further temperature/time treatment and between 1000-1100 ?C they polymorphously transfo

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