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Journal articles on the topic 'Faujasite X'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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1

Sutarno, Sutarno, and Arief Budyantoro. "SINTESIS DAN KARAKTERISASI FAUJASIT DARI ABU LAYANG : Kajian Pengaruh Waktu Sintesis Terhadap Stabilitas Termal Struktur Faujasit (Kinetics of Faujasite Formation from Fly Ash)." Sains & Teknologi 2, no. 2 (2019): 10. http://dx.doi.org/10.24123/jst.v2i2.2249.

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Faujasite was hydrothermally synthesized from fly ash at 100oC in alkaline solution by reflux with 5M HCl and fusion with NaOH (weight ratio of NaOH/fly ash = 1.2) pretreatments. Kinetics of faujasite formation was performed by variation of hydrothermal time (0-120 hours). Thermal stability of faujasite from fly ash was tested at 400-900oC and was compared with commercial zeolite Y. The solid products were characterized by X-ray diffraction method. Results showed that faujasite was formed through dissolution of fly ash components such as quartz, mullite and amorphous aluminosilicates (0-3 hour

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2

Sutarno, Sutarno, and Yateman Arryanto. "PHASE TRANSFORMATION IN THE FORMATION OF FAUJASITE FROM FLY ASH." Indonesian Journal of Chemistry 5, no. 3 (2010): 278–82. http://dx.doi.org/10.22146/ijc.21804.

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Faujasite was hydrothermally synthesized from fly ash at 100oC in alkaline solution by reflux with 5M HCl and fusion with NaOH pretreatments. Phase transformation in the formation of faujasite was performed by variation of NaOH/fly ash weight ratios and hydrothermal times. The solid products were characterized by X-ray diffraction method. Results showed that faujasite was formed through dissolution of fly ash components such as quartz, mullite and amorphous aluminosilicates followed by crystallization to form faujasite. Arranging the NaOH/fly ash weight ratio as well as hydrothermal time can s

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3

Sutarno, Sutarno, and Yateman Arryanto. "SYNTHESIS OF FAUJASITE WITH HIGH THERMAL STABILITY FROM FLY ASH." Indonesian Journal of Chemistry 4, no. 1 (2010): 26–32. http://dx.doi.org/10.22146/ijc.21870.

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Faujasite was hydrothermally synthesized from fly ash at 100oC in alkaline solution by reflux with various concentration of HCl and fusion with NaOH (weight ratio of NaOH/fly ash = 1.2) pretreatments. Thermal stability of faujasite from fly ash was tested at 400-900oC and was compared with commercial zeolite Y. The solid products were characterized by X-ray diffraction method, chemical analysis and nitrogen adsorption (BET). Results showed that synthesis of faujasite from fly ash via fusion pretreatment with NaOH has resulted faujasite selectively, however, the faujasite obtained still showed

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4

Capa-Cobos, Luis Fernando, Ximena Jaramillo-Fierro, and Silvia González. "Computational Study of the Adsorption of Phosphates as Wastewater Pollutant Molecules on Faujasites." Processes 9, no. 10 (2021): 1821. http://dx.doi.org/10.3390/pr9101821.

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The adsorption of sodium dihydrogen phosphate (NaH2PO4) onto X- and Y-type faujasite zeolites was computationally studied using the Density Functional Theory (DFT) method. The structures were modeled using the Materials Studio software. The Si/Al ratios for the X- and Y-type zeolite models were 1.2 and 2.5, respectively. The central pore of the zeolite provided a more favorable coordination for adsorbing NaH2PO4. Full molecular optimization and adsorption energy calculations were performed using the VASP code. The adsorption was more effective on zeolite Y, with an adsorption energy of 161 kJ/

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5

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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6

Sousa, Paulla B. F., Lindiane Bieseki, and Sibele B. C. Pergher. "Seed-Assisted Crystallization in the Hydrothermal Synthesis of FAU Zeolite from Acid-Treated Residue Glass Powder." Materials 18, no. 7 (2025): 1393. https://doi.org/10.3390/ma18071393.

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A simple and low-cost synthesis assisted by seed crystals has been proposed to convert residual colorless glass powder into a Na-X zeolite. For this purpose, the optimal parameters for acid leaching of glass powder were studied to remove impurities that could interfere with the crystallization process. Then, the hydrothermal syntheses were supported by Na-X seed crystals (0% to 5%, wt.) to induce the growth of zeolite X, evaluating the crystallization time (12 h to 48 h) and the variation of the silicon source (acid-treated and untreated residues). The formation of the faujasite as the main ph

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7

Setthaya, Naruemon, Chitsophin Pindi, Prinya Chindaprasirt, and Kedsarin Pimraksa. "Synthesis of Faujasite and Analcime Using of Rice Husk Ash and Metakaolin." Advanced Materials Research 770 (September 2013): 209–12. http://dx.doi.org/10.4028/www.scientific.net/amr.770.209.

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Faujasite and analcime were synthesized by two-step process via hydrothermal method using the rice husk ash and metakaolin as starting materials. In the first step, the raw materials were prepared using the SiO2/Al2O3molar ratio of 4 and pretreatment with NaOH solution under various stirring conditions. The suspension was subjected to hydrothermal treatment at various reacting time and temperature in second step. The mineralogy, morphology, specific surface area and cation exchange capacity of the synthesized products were investigated using X-ray diffraction, Scanning electron microscopy, N2a

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8

Guan, Liuliu, Zhuangzhuang Wang, and Duyou Lu. "Evolution of Zeolite Crystals in Self-Supporting Faujasite Blocks: Effects of Hydrothermal Conditions." Materials 12, no. 12 (2019): 1965. http://dx.doi.org/10.3390/ma12121965.

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In order to prepare self-supporting faujasite (FAU) zeolite, a self-supporting zeolite block was synthesized in situ by hydrothermal treatment of a metakaolin base geopolymer. The effects of hydrothermal conditions such as hydrothermal alkalinity, temperature and time on the phase composition, microstructure and mechanical strength of the hydrothermal samples were investigated and evidenced by a series of characterization methods such as X-ray diffraction (XRD), scanning electron microscopy (SEM), and Brunauer-Emmet-Teller (BET). The results showed that a self-supporting faujasite block could

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9

Schulz-Ekloff, G., and N. Jaeger. "Generation of bimodal metal dispersion in faujasite X." Catalysis Today 3, no. 5 (1988): 459–66. http://dx.doi.org/10.1016/0920-5861(88)87029-9.

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10

Khabzina, Y., C. Laroche, C. Pagis, and D. Farrusseng. "Monovalent and bivalent cations exchange isotherms for faujasites X and Y." Physical Chemistry Chemical Physics 19, no. 26 (2017): 17242–49. http://dx.doi.org/10.1039/c7cp02051a.

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This study addresses the modeling of exchange isotherms for faujasite-type zeolites X and Y with K<sup>+</sup>, Cs<sup>+</sup>, Ca<sup>2+</sup> and Ba<sup>2+</sup> cations based on a large experimental dataset obtained under operating conditions of 0.5 N total normality and an exchange temperature of 80 °C.

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11

Osio-Norgaard, Jorge, and Wil V. Srubar. "Zeolite Adsorption of Chloride from a Synthetic Alkali-Activated Cement Pore Solution." Materials 12, no. 12 (2019): 2019. http://dx.doi.org/10.3390/ma12122019.

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This work presents experimental evidence that confirms the potential for two specific zeolites, namely chabazite and faujasite (with a cage size ~2–13 Å), to adsorb small amounts of chloride from a synthetic alkali-activated cement (AAC) pore solution. Four synthetic zeolites were first exposed to a chlorinated AAC pore solution, two faujasite zeolites (i.e., FAU, X-13), chabazite (i.e., SSZ-13), and sodium-stabilized mordenite (i.e., Na-Mordenite). The mineralogy and chemical composition were subsequently investigated via X-ray diffraction (XRD) and both energy- and wavelength-dispersive X-ra

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12

Ryu, G. U., G. M. Kim, Hammad R. Khalid, and H. K. Lee. "The Effects of Temperature on the Hydrothermal Synthesis of Hydroxyapatite-Zeolite Using Blast Furnace Slag." Materials 12, no. 13 (2019): 2131. http://dx.doi.org/10.3390/ma12132131.

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Blast furnace slag, an industrial by-product, is emerging as a potential raw material to synthesize hydroxyapatite and zeolite. In this study, the effects of temperature on the hydrothermal synthesis of hydroxyapatite-zeolite from blast furnace slag were investigated. Specimens were synthesized at different temperatures (room temperature, 50, 90, 120, or 150 °C). The synthesized specimens were analyzed qualitatively and quantitatively via X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), BET/BJH, and scanning electron microscopy/energy dispersive using X-ray analysis (S

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13

Gener, Isabelle, Guy Buntinx, Alain Moissette, and Claude Brémard. "Photochemistry of Biphenyl Occluded within X Faujasite Type Zeolites." Journal of Physical Chemistry B 106, no. 40 (2002): 10322–29. http://dx.doi.org/10.1021/jp020454d.

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14

Ohata, Nayumi, Yurie Ito, Daisuke Gomibuchi, et al. "Nickel Phthalocyanine Complex Encapsulated into Nanopores of Faujasite Zeolite." Advanced Materials Research 11-12 (February 2006): 281–84. http://dx.doi.org/10.4028/www.scientific.net/amr.11-12.281.

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Nickel(II) phthalocyanine complexes encapsulated in X-type Zeolite were constructed by the ‘Ship-in-bottle’ synthesis, whose characterizations were performed by fluorescent X-ray, UV-vis, reflectance, and ESR spectroscopic methods. UV-vis and Reflectance spectra of NiPc-Na+-X suggested that the Pc ring was synthesized. Solid state ESR spectrum of NiPc-Na+-X gave characteristic pattern for organic radical species. Catalytic oxidation reactivity of the NiPc-Na+-X in homogeneous reaction have been studied for organic substrate in the presence of H2O2.

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15

Jiménez, Edward, Santiago Lalangui, Edison Guacho, et al. "Nanotechnological characterization of allofanite and faujasite (Y-faujasite) catalysts and comparing with a commercial FCC catalyst (X-zeolite)." AIMS Materials Science 6, no. 6 (2019): 911–43. http://dx.doi.org/10.3934/matersci.2019.6.911.

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16

Mojovic, Z., T. Mudrinic, Abu Rabi-Stankovic, et al. "Methanol electrooxidation on PtRu modified zeolite X." Science of Sintering 45, no. 1 (2013): 89–96. http://dx.doi.org/10.2298/sos1301089m.

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Zeolite NaX (faujasite type) was used as a support for platinum-ruthenium catalyst. A procedure for thermal decomposition of noble metal acetylacetonates to deposit noble metal clusters on the surface of solid support was adapted by authors to introduce noble metal clusters in zeolite cavities. The effectiveness of this composite material for methanol electrooxidation from alkaline solution was investigated by cyclic voltammetry. The influence of the concentration of supporting electrolyte, scan rate and rotation rate on the reaction of methanol oxidation was investigated. The obtained activit

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17

Su, B. L., M. Roussel, K. Vause, et al. "Organic group-bridged hybrid materials with a Faujasite X zeolite structure (ZOF-X)." Microporous and Mesoporous Materials 105, no. 1-2 (2007): 49–57. http://dx.doi.org/10.1016/j.micromeso.2007.06.029.

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18

van Miltenburg, Arjen, Jorge Gascon, Weidong Zhu, Freek Kapteijn, and Jacob A. Moulijn. "Propylene/propane mixture adsorption on faujasite sorbents." Adsorption 14, no. 2-3 (2008): 309–21. http://dx.doi.org/10.1007/s10450-007-9101-x.

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19

Zhan, Bi-Zeng, Mary Anne White, James A. Pincock, Katherine N. Robertson, T. Stanley Cameron, and Tsun-Kong Sham. "Oxidation of cyclohexane using a novel RuO2zeolite nanocomposite catalyst." Canadian Journal of Chemistry 81, no. 6 (2003): 764–69. http://dx.doi.org/10.1139/v03-060.

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We report the synthesis, using an organic-template-free hydrothermal crystallization method, and catalysis of a new type of nanocomposite material, 1.3 nm-sized RuO2 particles confined in faujasite zeolite. The zeolite-confined RuO2 composites were fully characterized with X-ray powder diffraction, Ru K-edge X-ray absorption, and high-resolution transmission electron microscopy. XRD and X-ray fluorescence analysis indicate that the framework is faujasite zeolite with a Si:Al ratio of 1.25. Ru K-edge X-ray absorption near-edge structures indicate that the ruthenium species in the zeolite is Ru(

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20

Samadhi, Tjokorde Walmiki, and Febrinaldo Eka Nugraha. "Rekayasa mikrosfer Zeolit sebagai sebagai penyangga katalis FCC dengan bahan baku mineral Kaolin." Jurnal Teknik Kimia Indonesia 11, no. 3 (2018): 149. http://dx.doi.org/10.5614/jtki.2012.11.3.4.

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Develpment of Zeolite as FCC catalyst support using Kaolin as a raw materialThis study is a preliminary evaluation of the feasibility of manufacturing fluid catalytic cracking (FCC) catalysts using Indonesian kaolins. A Belitung kaolin sample was spray-dried to form kaolin microspheres, and divided into two parts. One part is processed by low calcination (at 700-850 oC) and the other by high calcination (1000 oC). Metakaolins produced by these treatments were mixed, and reacted with concentrated NaOH solution hydrothermally at 100-110 oC. A reaction period of 18-24 hours produced faujasite pha

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21

Frising, T., and P. Leflaive. "Extraframework cation distributions in X and Y faujasite zeolites: A review." Microporous and Mesoporous Materials 114, no. 1-3 (2008): 27–63. http://dx.doi.org/10.1016/j.micromeso.2007.12.024.

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22

Pauliš, Petr, Libor Hrůzek, Oldřich Janeček, et al. "Faujasit-Na a doprovodná zeolitová mineralizace z lokality Klučky u Polevska v Lužických horách (Česká republika)." Bulletin Mineralogie Petrologie 28, no. 2 (2020): 417–36. http://dx.doi.org/10.46861/bmp.28.417.

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Four new zeolite occurrences have been discovered in a forested, 3 km long ridge Klučky, composed of basaltic rocks and culminating in the 642 m high elevation of the same name NW of the Nový Bor town in the Lužické hory Mts. At the Wachstein locality, the first occurrence of the rare zeolite faujasite-Na in the Czech Republic was verified. It forms octahedral crystals up to 0.3 mm in size with common twins according to spinel law. The unit-cell parameter of faujasite-Na refined from the powder X-ray data is a 24.6775(9) Å and V 15028.1(9) Å3. Its chemical analyses correspond to the empirical

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23

El-kordy, Abderrazek, Abdelaziz Elgamouz, El Mokhtar Lemdek, et al. "Preparation of Sodalite and Faujasite Clay Composite Membranes and Their Utilization in the Decontamination of Dye Effluents." Membranes 12, no. 1 (2021): 12. http://dx.doi.org/10.3390/membranes12010012.

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The present work describes the deposition of two zeolite films, sodalite and faujasite, by the hydrothermal method to tune the mesopores of clay support, which are prepared from a widely available clay depot from the central region of Morocco (Midelt). The clay supports were prepared by a powder metallurgy method from different granulometries with activated carbon as a porosity agent, using uniaxial compression followed by a sintering process. The 160 µm ≤ Φ ≤ 250 µm support showed the highest water flux compared to the supports made from smaller granulometries with a minimum water flux of 140

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24

Perez, Carlos A. C., Neuman S. de Resende, Vera M. M. Salim, and Martin Schmal. "Water Interaction in Faujasite Probed by in Situ X-ray Powder Diffraction." Journal of Physical Chemistry C 121, no. 5 (2017): 2755–61. http://dx.doi.org/10.1021/acs.jpcc.6b11111.

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25

Martin, A., B. Lücke, N. J. Jaeger, G. Schulz-Ekloff, D. Gutschick, and H. Miessner. "Metal dispersion dependent selectivities for syngas conversion on faujasite X hosted rhodium." Catalysis Letters 13, no. 3 (1992): 247–59. http://dx.doi.org/10.1007/bf00770997.

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26

Bolonio, David, Yolanda Sánchez-Palencia, María-Jesús García-Martínez, et al. "La-Faujasite zeolite activated with boron trifluoride: synthesis and application as solid acid catalyst for isobutane–isobutene alkylation." Applied Petrochemical Research 11, no. 3 (2021): 353–62. http://dx.doi.org/10.1007/s13203-021-00283-x.

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AbstractThe sodium form of Faujasite Y (Na-FAU) zeolite has been synthesized by the hydrothermal method, and it has been exchanged with ammonium sulphate and later with lanthanum (III) chloride solutions to obtain the La-FAU catalyst. The three zeolites Na-FAU, NH4+-FAU and La-FAU have been characterized by microcrystalline X-ray diffraction, X-ray fluorescence, surface area, pore volume and Brönsted acid sites. The La-FAU catalyst has been successfully activated with boron trifluoride etherate, and it has been tested in the alkylation reaction of isobutane with isobutene up to 112 h of time o

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27

Rongchapo, Wina, Chalermpan Keawkumay, Nattawut Osakoo, et al. "Comprehension of paraquat adsorption on faujasite zeolite X and Y in sodium form." Adsorption Science & Technology 36, no. 1-2 (2017): 684–93. http://dx.doi.org/10.1177/0263617417715394.

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The nature of paraquat adsorption is compared between zeolite NaX and NaY which have the same faujasite structure but different Si/Al ratio, namely 1.2 and 2.2, respectively. The adsorption was proposed to occur via ion exchange and expected to increase with Al content. However, NaX had a lower paraquat adsorption capacity than NaY. The bare and paraquat-containing zeolites (PQX and PQY) were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, N2 adsorption–desorption analysis, magic-angle spinning nuclear magnetic resonance (MAS) NMR, and X-ray photoelectron spectrosc

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28

Bouvy, C., W. Marine, R. Sporken, and B. L. Su. "Nanosized ZnO confined inside a Faujasite X zeolite matrix: Characterization and optical properties." Colloids and Surfaces A: Physicochemical and Engineering Aspects 300, no. 1-2 (2007): 145–49. http://dx.doi.org/10.1016/j.colsurfa.2006.12.043.

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29

Smoliło, Małgorzata, Katarzyna Samson, Ting Zhou, et al. "Oxidative Dehydrogenation of Propane over Vanadium-Containing Faujasite Zeolite." Molecules 25, no. 8 (2020): 1961. http://dx.doi.org/10.3390/molecules25081961.

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Oxidative dehydrogenation (ODH) of light alkanes to olefins—in particular, using vanadium-based catalysts—is a promising alternative to the dehydrogenation process. Here, we investigate how the activity of the vanadium phase in ODH is related to its dispersion in porous matrices. An attempt was made to synthesize catalysts in which vanadium was deposited on a microporous faujasite zeolite (FAU) with the hierarchical (desilicated) FAU as supports. These yielded different catalysts with varying amounts and types of vanadium phase and the porosity of the support. The phase composition of the cata

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30

Längauer, David, Vladimír Čablík, Slavomír Hredzák, Anton Zubrik, Marek Matik, and Zuzana Danková. "Preparation of Synthetic Zeolites from Coal Fly Ash by Hydrothermal Synthesis." Materials 14, no. 5 (2021): 1267. http://dx.doi.org/10.3390/ma14051267.

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Large amounts of coal combustion products (as solid products of thermal power plants) with different chemical and physical properties cause serious environmental problems. Even though coal fly ash is a coal combustion product, it has a wide range of applications (e.g., in construction, metallurgy, chemical production, reclamation etc.). One of its potential uses is in zeolitization to obtain a higher added value of the product. The aim of this paper is to produce a material with sufficient textural properties used, for example, for environmental purposes (an adsorbent) and/or storage material.

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31

M, Abakpa A., Leke L, Twan S. M, Japhet T, Ewenifa O. J, and Omale, O. P. "Synthesis and Characterisation of Calcined Zeolite X and Silica-Supported Zeolite Y." African Journal of Sciences and Traditional Medicine 1, no. 1 (2024): 157–68. https://doi.org/10.58578/ajstm.v1i1.3493.

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Zeolite X was synthesised from rice husk silica and aluminium metal as raw materials while Zeolite Y supported catalyst was synthesised from sodium hydroxide, sodium silicate and alumina as chemical raw materials and was impregnated with rice husk silica by wet impregnation method, the catalyst were subsequently calcined at 550 0C for 6h the catalysts were characterised using XRD, FTIR and SEM. The formation of AlO4/SiO4 catalyst was confirmed by the analysis aforementioned. The XRD revealed that Zeolite X and Y synthesized has a faujasite phase with major peaks 230, 22.50 and 17.50, 180 in ze

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32

Mahmoud, Eyas. "Synergistic effect of acidity and extraframework position in faujasite on renewable p -xylene production." Royal Society Open Science 5, no. 5 (2018): 172471. http://dx.doi.org/10.1098/rsos.172471.

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p -Xylene is a commodity chemical used for the manufacture of plastic bottles and textiles. For the biomass-based route from 2,5-dimethylfuran (DMF) and ethylene, the properties of the catalyst such as acidity effect, product selectivity and catalyst activity play an important role. To determine the effect of acidity and extraframework position in faujasite zeolite on p -xylene selectivity, type Y (Si/Al = 40 and Si/Al = 2.55) and X (Si/Al = 1.25) zeolites containing the extraframework Lewis acids Na+, K+, Li+, Ag+ and Cu+, and a Brønsted acid-containing zeolite, HY (Si/Al = 40), were prepared

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33

Yoshida, Akira, and Kouzou Inoue. "Formation of faujasite-type zeolite from ground Shirasu volcanic glass." Zeolites 6, no. 6 (1986): 467–73. http://dx.doi.org/10.1016/0144-2449(86)90031-x.

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34

Isambert, Aude, Emmanuel Angot, Philippe Hébert, et al. "Amorphization of faujasite at high pressure: an X-ray diffraction and Raman spectroscopy study." Journal of Materials Chemistry 18, no. 47 (2008): 5746. http://dx.doi.org/10.1039/b809774g.

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35

Melegari, Gianni, and Ottorino Ori. "Computer-Aided Topological Analysis of the Faujasite Lattice I: Exact Solution for Zeolite-X." Molecular Simulation 3, no. 4 (1989): 235–50. http://dx.doi.org/10.1080/08927028908031376.

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36

Dyer, A., and J. K. Abou-Jamous. "Zeolites for nuclear waste treatment: Co, Ni and Zn uptake into synthetic faujasite X." Journal of Radioanalytical and Nuclear Chemistry 224, no. 1-2 (1997): 59–66. http://dx.doi.org/10.1007/bf02034612.

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37

Ziethen, H. M., G. Doppler, A. X. Trautwein, and F. Schmidt. "Formation and characterization of very small iron clusters in zeolites of faujasite-type X." Catalysis Today 3, no. 1 (1988): 83–96. http://dx.doi.org/10.1016/0920-5861(88)80021-x.

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38

Czarna-Juszkiewicz, Dorota, Piotr Kunecki, Rafał Panek, Jarosław Madej, and Magdalena Wdowin. "Impact of Fly Ash Fractionation on the Zeolitization Process." Materials 13, no. 5 (2020): 1035. http://dx.doi.org/10.3390/ma13051035.

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Coal combustion product in the form of fly ash has been sieved and successfully utilised as a main substrate and a carrier of silicon and aluminium in a set of hydrothermal syntheses of zeolites. The final product was abundant in zeolite X phase (Faujasite framework). Raw fly ash as well as its derivatives, after being sieved (fractions: ≤ 63, 63–125, 125–180 and ≥ 180 µm), and the obtained zeolite materials were subjected to mineralogical characterisation using powder X-ray diffraction, energy-dispersive X-ray fluorescence, laser diffraction-based particle size analysis and scanning electron

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39

Pollack, S. S., R. J. Gormley, and E. L. Wetzel. "Changes in the Unit Cell Dimensions of ZSM-5 Produced by the Adsorption of Organic Liquids*." Advances in X-ray Analysis 29 (1985): 257–64. http://dx.doi.org/10.1154/s037603080001034x.

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The adsorption of liquids in 2eolites has been a widely studied phenomenon, and with the development of ZSM-5, considerable work has been carried out on this zeolite, However, few articles have been published dealing with changes in the X-ray diffraction patterns when the zeolite pores contain adsorbed molecules. The purpose of this paper is to report changes in the X-ray diffraction pattern of ZSM-5 after mixing it with various organic solvents.This work began after studies of both deactivated and partially deactivated ZSM-5 catalysts showed that their X-ray diffraction patterns changed in in

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40

Grass, Jan-Paul, Katharina Klühspies, Bastian Reiprich, Wilhelm Schwieger, and Alexandra Inayat. "Layer-Like Zeolite X as Catalyst in a Knoevenagel Condensation: The Effect of Different Preparation Pathways and Cation Exchange." Catalysts 11, no. 4 (2021): 474. http://dx.doi.org/10.3390/catal11040474.

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This study is dedicated to the comparative investigation of the catalytic activity of layer-like Faujasite-type (FAU) zeolite X obtained from three different synthesis routes (additive-free route, Li2CO3 route, and TPOAC route) in a liquid-phase Knoevenagel condensation of benzaldehyde and ethyl cyanoacetate to ethyl trans-α-cyanocinnamate. It is shown that the charge-balancing cations (Na+ and K+) and the morphological properties have a strong influence on the apparent reaction rate and degree of conversion. The highest initial reaction rate could be found for the layer-like zeolite X synthes

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Temuujin, J., A. Minjigmaa, B. Davaabal, and Z. Ochirbat. "Characterisation of fly ashes from 4th Thermal Power Station of Ulaanbaatar city and its applicability for a zeolite synthesis." Mongolian Journal of Chemistry 12 (September 24, 2014): 16–19. http://dx.doi.org/10.5564/mjc.v12i0.164.

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Fly ash from 4th thermal power station of Ulaanbaatar city have been characterised by x-ray fluorescence (XRF), x-ray diffractometry (XRD), particle size analyzer, specific surface area measurement (BET) and scanning electron microscope (SEM) observation. It was found that fly ash from Baganuur coal contains over 15 wt.% of calcium oxide (CaO) and could be assigned as class C fly ash, according to the International classification. Specific surface area of this fly ash was 2.75 m2/g and mean particle diameter was 59.5 μm. Zeolitic compounds were synthesised by using mixture of this fly ash and

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Maneck, H. E., D. Gutschick, I. Burkhardt, B. Luecke, H. Miessner, and U. Wolf. "Heterogeneous carbonylation of methanol on rhodium introduced into faujasite-type zeolites." Catalysis Today 3, no. 5 (1988): 421–29. http://dx.doi.org/10.1016/0920-5861(88)87024-x.

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Ryu, G. U., Hammad R. Khalid, Namkon Lee, Zhen Wang, and H. K. Lee. "The Effects of NaOH Concentration on the Hydrothermal Synthesis of a Hydroxyapatite–Zeolite Composite Using Blast Furnace Slag." Minerals 11, no. 1 (2020): 21. http://dx.doi.org/10.3390/min11010021.

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This study investigated the effect of NaOH concentration on the assemblage, crystallinity, and dimension of crystalline phases in hydroxyapatite–zeolite composites made with blast furnace slag. X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy measurement, scanning electron microscopy (SEM), and nitrogen adsorption–desorption tests were conducted to characterize the synthesized composites. In addition, the cesium adsorption potential of the synthesized composites was evaluated to assess the feasibility of using hydroxyapatite–zeolite composites synthesized from blast fur

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Liguori, Barbara, Paolo Aprea, Bruno de Gennaro, Fabio Iucolano, Abner Colella, and Domenico Caputo. "Pozzolanic Activity of Zeolites: The Role of Si/Al Ratio." Materials 12, no. 24 (2019): 4231. http://dx.doi.org/10.3390/ma12244231.

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A great challenge of research is the utilization of natural or synthetic zeolites, in place of natural pozzolans, for manufacturing blended cements. The difficulties of interpretation of the pozzolanic behavior of natural zeolite-rich materials and the role played by their nature and composition can be overcome by studying more simple systems, such as pure synthetic zeolites. This study aims at investigating the pozzolanic ability of isostructural zeolites with different framework compositions, such as three sodium zeolites of the faujasite (FAU) framework type: LSX, X, and Y. The pozzolanic a

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Long, Nguyen Quang, Ho Thi Vuong, Huynh Ky Phuong Ha, Winarto Kuniawan, Hirofumi Hinode, and Toshihide Baba. "PREPARATION, CHARACTERIZATION AND H2S ADSORPTIVE REMOVAL OF ION-EXCHANGED ZEOLITE X." ASEAN Engineering Journal 5, no. 1 (2015): 4–14. http://dx.doi.org/10.11113/aej.v5.15463.

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This research focuses on the adsorptive removal of polluted H2S at ambient temperature by modified zeolite X adsorbents. The zeolite X has been synthesized by hydrothermal method and ion- exchanged with six different divalent metal ions including Co2+, Mn2+, Ni2+, Cu2+, Ca2+ , and Zn2+. The H2S adsorption activity of the material was determined by a continuous fixed-bed adsorption system and expressed by the adsorption capacity performance until the H2S output concentration reach a specified breakthrough point of 10 ppm. The materials have been subjected to X-ray diffraction (XRD) for structur

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Ammouli, Tarik, Jean-Louis Paillaud, Habiba Nouali, et al. "Insights into Water Adsorption in Potassium-Exchanged X-type Faujasite Zeolite: Molecular Simulation and Experiment." Journal of Physical Chemistry C 125, no. 35 (2021): 19405–16. http://dx.doi.org/10.1021/acs.jpcc.1c03593.

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Turnes Palomino, G., C. Otero Areán, and M. R. Llop Carayol. "Hydrogen adsorption on the faujasite-type zeolite Mg–X: An IR spectroscopic and thermodynamic study." Applied Surface Science 256, no. 17 (2010): 5281–84. http://dx.doi.org/10.1016/j.apsusc.2009.12.118.

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Narang, Kritika, and Farid Akhtar. "Freeze Granulated Zeolites X and A for Biogas Upgrading." Molecules 25, no. 6 (2020): 1378. http://dx.doi.org/10.3390/molecules25061378.

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Biogas is a potential renewable energy resource that can reduce the current energy dependency on fossil fuels. The major limitation of utilizing biogas fully in the various applications is the presence of a significant volume fraction of carbon dioxide in biogas. Here, we used adsorption-driven CO2 separation using the most prominent adsorbents, NaX (faujasite) and CaA (Linde Type A) zeolites. The NaX and CaA zeolites were structured into hierarchically porous granules using a low-cost freeze granulation technique to achieve better mass transfer kinetics. The freeze granulation processing para

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Ramamurthy, V., D. R. Sanderson, and D. F. Eaton. "PHOTOPHYSICAL PROBES FOR MONITORING THE ELECTRIC FIELD/MICROPOLARITY WITHIN THE FAUJASITE SUPERCAGE." Photochemistry and Photobiology 56, no. 3 (1992): 297–303. http://dx.doi.org/10.1111/j.1751-1097.1992.tb02163.x.

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Setthaya, Naruemon, Prinya Chindaprasirt, and Kedsarin Pimraksa. "Preparation of Zeolite Nanocrystals via Hydrothermal and Solvothermal Synthesis Using of Rice Husk Ash and Metakaolin." Materials Science Forum 872 (September 2016): 242–47. http://dx.doi.org/10.4028/www.scientific.net/msf.872.242.

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Synthesis of zeolite nanocrystals from rice husk ash and metakaolin was studied. Hydrothermal and solvothermal methods at 120 °C for 6 h were used as comparative study. Starting mixes were prepared with SiO2/Al2O3 molar ratio of 4. Two factors; stirring time before hydrothermal and solvothermal treatments and solvent types were studied. The synthesized products were characterized in terms of mineralogy using X-ray diffraction, specific surface area using N2 adsorption and desorption isotherm, morphology and composition using scanning electron microscopy and electron dispersion X-ray analysis.

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