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Journal articles on the topic 'High-silica zeolite'

Author: Grafiati

Published: 7 June 2025

Last updated: 2 August 2025

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1

Kurniawan, Teguh, Dhimas Satria, Juniafit Bima Saputra, Muhammad Roil Bilad, Nik Abdul Hadi Md Nordin, and Hairus Abdullah. "Conversion of Green Silica from Corn Leaf into Zeolites Na A-X." Indonesian Journal of Science and Technology 7, no. 2 (2022): 171–86. http://dx.doi.org/10.17509/ijost.v7i2.45831.

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Combustion of corn leaf as a model of biomass from agricultural waste is a simple way to obtain the energy. It produces a low-value by-product of ash and is rich in silica that can become a precursor for zeolite production. In this study, acid-treated corn leaves combustion was performed to produce high purity silica (SiO2). The diffraction pattern suggested that the extracted silica was amorphous without the impurities phase. Additionally, the nitrogen isotherm indicated that the material was highly mesoporous silica with a total surface area of 200 m2/g. The hydrothermal method was then appl

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2

Ravshanov, Bobomurat, Hudoyor Rakhmatov, Normurot Fayzullaev, et al. "Application of energy-saving technologies in drying natural gas from water vapour." E3S Web of Conferences 623 (2025): 02007. https://doi.org/10.1051/e3sconf/202562302007.

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In this research the energy saving technology of drying natural gas from water vapour is presented. The experimental device was tested at the station of gas processing plants in Mubarak gas processing plant in Uzbekistan. The adsorption capacity of mesoporous high-silica zeolite with high sorption properties lubricated under static conditions was studied. In addition to that the depth of drying of natural gas from water vapour was studied under dynamic conditions based on oiled high sorption mesoporous high silica zeolite. Also, the dynamic capacity of high sorption properties was studied, whi

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3

Trivana, Linda, Sri Sugiarti, and Eti Rohaeti. "SYNTHESIS OF ZEOLITE AND COMPOSITE OF ZEOLITE/TiO2 FROM KAOLIN AND ITS APLICATION TO ADSORPTION-PHOTODEGRADATION OF METHILEN BLUE." ALCHEMY Jurnal Penelitian Kimia 11, no. 2 (2016): 147. http://dx.doi.org/10.20961/alchemy.11.2.722.147-162.

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<p>In this study, zeolite was synthesized from kaolin which was founded from Bangka Belitung as the starting material. Meanwhile, sodium silicate was used as silica source. Zeolite is material with many benefits, such as become an adsorbent. Kaolin has been used as starting material due to high content of silica and alumina, i.e 35 - 50 %. Zeolite was prepared by hydrothermal synthesis process, by mixing the metakaolin which was produced by calcination of kaolin at 700 °C for 6 hours, with sodium silicate and NaOH. The NaOH was used to activate the major components of Si and Al in the ka

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4

Trivana, Linda, Sri Sugiarti, and Eti Rohaeti. "SYNTHESIS OF ZEOLITE AND COMPOSITE OF ZEOLITE/TiO2 FROM KAOLIN AND ITS APLICATION TO ADSORPTION-PHOTODEGRADATION OF METHILEN BLUE." ALCHEMY Jurnal Penelitian Kimia 11, no. 2 (2016): 147. http://dx.doi.org/10.20961/alchemy.v11i2.722.

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<p>In this study, zeolite was synthesized from kaolin which was founded from Bangka Belitung as the starting material. Meanwhile, sodium silicate was used as silica source. Zeolite is material with many benefits, such as become an adsorbent. Kaolin has been used as starting material due to high content of silica and alumina, i.e 35 - 50 %. Zeolite was prepared by hydrothermal synthesis process, by mixing the metakaolin which was produced by calcination of kaolin at 700 °C for 6 hours, with sodium silicate and NaOH. The NaOH was used to activate the major components of Si and Al in the ka

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5

Erofeev, Vladimir I., Sofiya N. Dzhalilova, Mikhail V. Erofeev, Vasilii S. Ripenko, and Vladimir P. Reschetilowski. "Conversion of the Propane–Butane Fraction into Arenes on MFI Zeolites Modified by Zinc Oxide and Activated by Low-Temperature Plasma." Molecules 25, no. 11 (2020): 2704. http://dx.doi.org/10.3390/molecules25112704.

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The effect of modification of MFI zeolite 1–5 wt.% ZnO activated by plasma on acid and catalytic properties in the conversion of the propane–butane fraction into arenes was investigated. The high-silica zeolites with silicate module 45 were synthesized from alkaline alumina–silica gels in the presence of an ‘X-oil’ organic structure-forming additive. The modification of the zeolite with zinc was carried out by impregnating the zeolite granules in the H-form with an aqueous solution of Zn(NO3)2. The obtained zeolites were characterized by X-ray phase analysis and IR spectroscopy. It is shown th

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6

Rahayu, Endang Sri, Desi Bentang, and Ghina Fauziyyah. "Penggunaan Kembali Limbah Cair dari Sintesis Zeolit Y sebagai Sumber Silika untuk Sintesis Zeolit Y secara Hidrotermal." Jurnal Teknik Kimia Indonesia 18, no. 2 (2020): 53. http://dx.doi.org/10.5614/jtki.2019.18.2.4.

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Abstrak. Penelitian ini dilakukan untuk mempelajari kemungkinan limbah cair atau mother liquor dari sintesis zeolit Y yang masih mengandung silika dapat digunakan kembali sebagai sumber silika untuk sintesis zeolit Y, dengan menambahkan bibit kristal dan alumina ke dalam limbah cair. Sintesis zeolite Y dilakukan secara hidrotermal pada temperatur 93oC dan pH sekitar 13. Rasio molar silika /alumina sekitar 10 mol/mol di dalam starting material diperlukan untuk mendukung terbentuknya zeolit Y. Seberapa banyak turunan atau penggunaan kembali limbah cair sintesis zeolit Y untuk sintesis zeolit Y,

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7

Rаhmatov, Khudoyor, Normurot Fayzullaev, Firdavsiy Buronov, et al. "Aromatization patterns of hexane in high silicon zeolite." E3S Web of Conferences 524 (2024): 03018. http://dx.doi.org/10.1051/e3sconf/202452403018.

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In this article, methods of preparation of catalysts in analogues of in high-silica zeolite, conversion of n-hexane in the catalysts keeping in high-silica zeolite, of n-hexane to aromatic hydrocarbons, n-hexane to aromatic hydrocarbons in catalysts with high catalytic activity and selectivity modified with copper, 2%Cu*8%Zn/Н-High silica zeolite-40 conversion of n-hexane to aromatic hydrocarbons in the composition catalyst, activity in chain branching and aromatization processes to obtain high-octane components of fuels 2%Cu*8%Zn/Н-High silica zeolite-40 high silicon, A mesoporous aluminosili

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8

Li, Jian, Zihao Rei Gao, Qing-Fang Lin, et al. "A 3D extra-large-pore zeolite enabled by 1D-to-3D topotactic condensation of a chain silicate." Science 379, no. 6629 (2023): 283–87. http://dx.doi.org/10.1126/science.ade1771.

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Zeolites are microporous silicates with a large variety of applications as catalysts, adsorbents, and cation exchangers. Stable silica-based zeolites with increased porosity are in demand to allow adsorption and processing of large molecules but challenge our synthetic ability. We report a new, highly stable pure silica zeolite called ZEO-3, which has a multidimensional, interconnected system of extra-large pores open through windows made by 16 and 14 silicate tetrahedra, the least dense polymorph of silica known so far. This zeolite was formed by an unprecedented one-dimensional to three-dime

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9

Tsujiguchi, Masato, Tadashi Kobashi, Junji Kanbara, Yasuhiko Utsumi, Nobuaki Kakimori, and Atsushi Nakahira. "Synthesis and Characterization of Zeolite from Glass by Hydrothermal Processing." Materials Science Forum 761 (July 2013): 91–94. http://dx.doi.org/10.4028/www.scientific.net/msf.761.91.

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Zeolite is a microporous aluminosilicate material with uniform pore size of less than 2 nm and chemical, mechanical, and thermal stability. In general zeolite is synthesized from silica, alumina, mineralizer (alkali metal hydroxide and fluoride) and water. Recently it has been reported that various zeolites is synthesized from soda-lime glass, slag and coal fly ash as silica and alumina source. On the other hand, the production volume of various kinds of high-quality glass which are utilized for high-tech products such as liquid crystal displays and plasma displays is rapidly increasing. The p

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10

Sriatun, Sriatun, Heru Susanto, Widayat Widayat, and Adi Darmawan. "Hydrocracking of Coconut Oil on the NiO/Silica-Rich Zeolite Synthesized Using a Quaternary Ammonium Surfactant." Indonesian Journal of Chemistry 21, no. 2 (2020): 361. http://dx.doi.org/10.22146/ijc.55522.

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NiO/silica-rich zeolite catalysts were used for coconut oil hydrocracking. The catalyst was prepared with a mixture of Na2SiO3, Al(OH)3, NaOH, and quaternary ammonium surfactants. The surfactant was varied of types like as tetrapropylammonium bromide (TPAB) and cetyltrimethylammonium bromide (CTAB). The acidity of the silica-rich sodalite zeolites enhances with the increase in nickel oxide added through a wet impregnation. The hydrocracking process was carried out by a semi-batch method. Liquid products were analyzed using GC-MS. The results showed that the addition of surfactants increased th

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11

Sri Rahayu, Endang, Gatot Subiyanto, Arief Imanuddin, et al. "Kaolin as a Source of Silica and Alumina For Synthesis of Zeolite Y and Amorphous Silica Alumina." MATEC Web of Conferences 156 (2018): 05002. http://dx.doi.org/10.1051/matecconf/201815605002.

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Kaolin is the clay mineral which containing silica (SiO2) and alumina (Al2O3) in a high percentage, that can be used as a nutrient in the synthesis of zeolites and amorphous silica alumina (ASA). The objective of this research is to convert the Belitung kaolin into silica and alumina as nutrients for the synthesis of zeolites and amorphous silica alumina, which are required in the preparation of the catalysts. Silica and alumina contained in the kaolin were separated by leaching the active kaolin called as metakaolin, using HCL solution, giving a solid phase rich silica and a liquid phase rich

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12

Dang, Long Van, Thu Thi Minh Nguyen, Dang Van Do, Son Thanh Le, Trong Dinh Pham, and Anh Thi Mai Le. "Study on the Synthesis of Chabazite Zeolites via Interzeolite Conversion of Faujasites." Journal of Analytical Methods in Chemistry 2021 (March 29, 2021): 1–10. http://dx.doi.org/10.1155/2021/5554568.

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The interzeolite conversion of faujasite (FAU-type) zeolites to chabazite (CHA-type) zeolite in the presence of N,N,N-trimethyladamantammonium and N,N,N-dimethylethylcyclohexylammonium cations was investigated over a large compositional range by carefully controlling the reaction mixture compositions. Highly crystalline CHA zeolites were also obtained by the transformation of several zeolite types including EMT, LTL, LEV, RTH, and MFI frameworks. The formation of CHA zeolite from FAU zeolite precursors was substantially faster than that from zeolite L with a similar composition. High-silica CH

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13

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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14

Krisnandi, Yuni K., Indah R. Saragi, Riwandi Sihombing, et al. "Synthesis and Characterization of Crystalline NaY-Zeolite from Belitung Kaolin as Catalyst for n-Hexadecane Cracking." Crystals 9, no. 8 (2019): 404. http://dx.doi.org/10.3390/cryst9080404.

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Crystalline sodium Y (NaY) zeolite has been synthesized using alternative natural source of aluminate and silicate, extracted from natural Belitung kaolin. Prior to use, the natural kaolin was pretreated to obtain fragmented metakaolin and extracted silica. Synthesis was conducted with the addition of NaY gel (two types of NaY seeds were used, prepared from colloidal sillica or sodium silica water) using hydrothermal method for 21 h at 100 °C. The characterization on the as-synthesized zeolites confirmed that the one prepared using colloidal silica-seed has closer structure similarity to NaY z

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15

Bo, Songcheng, Kaixuan Yang, Hongying Lü, and Zhiguo Zhu. "Preparation of MAZ-Type Zeolite with High Silica." Molecules 29, no. 14 (2024): 3315. http://dx.doi.org/10.3390/molecules29143315.

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The Si/Al molar ratio of MAZ aluminosilicate zeolite prepared by the direct hydrothermal method is generally less than five, thus giving rise to poor thermal and hydrothermal stability for this low-silica zeolite. With the purpose of enhancing the Si/Al molar ratio of MAZ zeolite, post-synthesized methods including acetic acid treatment and steaming treatment, as well as interzeolite transformation from FAU zeolite, were employed to prepare MAZ zeolite with high silica. It was found that steaming treatment was more effective in increasing the Si/Al molar ratio in comparison with acetic acid tr

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16

de Longe, Clenildo, Aryandson da Silva, Anne Beatriz Figueira Câmara, et al. "Synthesis of LTA Zeolite from Beach Sand: A Solution for CO2 Capture." Coatings 15, no. 3 (2025): 334. https://doi.org/10.3390/coatings15030334.

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Emissions caused by polluting gases, such as carbon dioxide, are one of the main contributors to the generation of the greenhouse effect that leads to global warming, responsible for climate change. An alternative to mitigating these emissions is the use of adsorbents capable of capturing CO2. Zeolites are considered one of the most effective adsorbents in gas adsorption and separation technologies due to their high specific area and pore size and, consequently, greater adsorption capacity when compared to other commonly used materials. Despite this, reagents used in syntheses as the source of

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17

Erofeev, Vladimir, Vyacheslav Khasanov, Sofia Dzhalilova, Wladimir Reschetilowski, Anna Syskina, and Lyubov Bogdankova. "Acidic and Catalytic Properties of Zeolites Modified by Zinc in the Conversion Process of Lower C3–C4 Alkanes." Catalysts 9, no. 5 (2019): 421. http://dx.doi.org/10.3390/catal9050421.

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The acid and catalytic properties of the modified MFI zeolite catalysts during the conversion of the propane–butane fraction of the associated petroleum gases into the aromatic hydrocarbons were studied. It was established that the high-silica zeolites synthesized with the new structure-forming additive of the alcohol fraction (ZKE-AF) belong to the high-silica MFI zeolites. The resulting zeolites were modified by 1–5 wt. % additives consisting of zinc oxide and sulfide. The influence of the modifying additive concentration containing zinc oxides and sulfides in an amount of 1–5% on the acid a

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18

dos Santos, Everton Ranny Ferreira, Aécio Barbosa Sousa, Romulo Charles Nascimento Leite, Hervé Michel Laborde, Romualdo Rodrigues Menezes, and Meiry Glaúcia Freire Rodrigues. "Preparation of Zeolite MCM-22 Using the Rice Husk Ash as Silica Source." Materials Science Forum 805 (September 2014): 646–50. http://dx.doi.org/10.4028/www.scientific.net/msf.805.646.

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Brazil is a great producer of rice generating large amounts of husks after rice processing. These hulls contain high percentage of SiO2, and a great potential as raw material for the development of silica based materials, as zeolites. Thus, this work aims to use the silica of rice hulls as an alternative raw material for the production of zeolite MCM-22. This material was characterized through X-ray diffraction, X-ray spectrophotometry and physical adsorption of N2 (BET). The diffraction pattern of precursor MCM-22 presented typical peaks of topology MWW. Calcined sample did not presented peak

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Hayakawa, Eiji, and Shuji Himeno. "Preparation of Al-Containing ZSM-58 Zeolite Membranes Using Rapid Thermal Processing for CO2/CH4 Mixture Separation." Membranes 11, no. 8 (2021): 623. http://dx.doi.org/10.3390/membranes11080623.

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The synthesis of DDR-type zeolite membranes faces the problem of cracks that occur on the zeolite membrane due to differences in the thermal expansion coefficient between zeolite and the porous substrate during the detemplating process. In this study, Al-containing ZSM-58 zeolite membranes with DDR topology were prepared by rapid thermal processing (RTP), with the aim of developing a reproducible method for preparing DDR zeolite membrane without cracks. Moreover, we verified the influence of RTP before performing conventional thermal calcination (CTC) on ZSM-58 membranes with various silica-to

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20

Hasegawa, Yasuhisa, and Chie Abe. "Prediction of Adsorption and Diffusion Behaviors of CO2 and CH4 in All-Silica Zeolites Using Molecular Simulation." Membranes 11, no. 6 (2021): 392. http://dx.doi.org/10.3390/membranes11060392.

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Computational chemistry is a promising technique for the prediction of material properties. Adsorption and diffusion behaviors in zeolite micropores are important for zeolite membranes. In this study, we investigated novel non-bonding interaction parameters of all-silica zeolites for the prediction of the adsorption and diffusion behaviors by focusing on the Si atom of zeolite frameworks. Our parameters (σ = 0.421 nm, ε = 0.954 kJ mol−1, and q = +1.10 e) were close to theoretically derived values, and the adsorption isotherms of CO2 and CH4 on several zeolites could be predicted with high accu

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21

Dahl, Ivar M., Elisabeth Myhrvold, Åse Slagtern, and Michael Stöcker. "Adsorption of Lower Alcohols from Water Solutions on High Silica Zeolites, Mesoporous MCM-41 and AlPO4-5." Adsorption Science & Technology 15, no. 4 (1997): 289–99. http://dx.doi.org/10.1177/026361749701500404.

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Two dealuminated β-zeolites, zeolite Y and MCM-22 as well as silicalite, MCM-41 and AlPO4-5 have been studied as hydrophobic adsorbents in water solutions. Dealuminated β-zeolite, MCM-22 and silicalite all adsorb alcohols from water solutions. Enhanced adsorption is obtained for alcohols with longer alkyl chains. Adsorption in the practically most interesting 10–80% range of zeolite filling may adequately be described by Langmuir isotherms. The Langmuir adsorption constants are similar for β-zeolite, MCM-22 and silicalite. This indicates that the adsorption is independent of the pore structure

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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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23

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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Zhao, Yukai, Weichi Liang, Yihan Wang, et al. "F−@d4r, a New Type of Acidic Catalytic Site in Zeolite." Catalysts 12, no. 8 (2022): 809. http://dx.doi.org/10.3390/catal12080809.

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As a solid acid, zeolite has been widely used in many fields such as tail gas treatment, petrochemical engineering, and the fine chemical industry. F− has been widely used in the synthesis of pure silica or high silica zeolites. To balance the charge of organic structure directing agents (OSDA), F− is often found located at the center of the double-4-rings (d4r) of the as-made zeolites. During calcination, fluorine ion is removed with the OSDA. We screened a series of composition building units and found that d4r is capable to retain F− in zeolite structure. We introduce the F− back after the

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Redi, Muhamad, Intan Rizki Widya Astuti, Restu Agung Ramadhani, et al. "Zeolite Synthesis Based Silica from Saccharum officinarum L. with Black Stem Using the Hydrothermal Method." Jurnal Pijar Mipa 19, no. 3 (2024): 473–78. http://dx.doi.org/10.29303/jpm.v19i3.6541.

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Saccharum officinarum L. has a high amount of silica content, which can be used as the main component of zeolite synthesis. Silica was isolated from Saccharum officinarum L. bagasse with NaOH and HCl. This research aims to synthesize zeolite using silica from Saccharum officinarum L. with black stem and alumina from aluminium foil. The Saccharum officinarum L. used in this research was sourced from Lombok Island, West Nusa Tenggara Province, Indonesia. Silica was sourced from Saccharum officinarum L. using the sol-gel method. The silica from the isolation of dregs ash obtained 20 g of silica w

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Septiansyah, Sy Indra, and Maya Santi. "Pemanfaatan Alumina Waste dari Tailing Bauksit Menjadi Zeolit Adsorben." EKSPLORIUM 39, no. 2 (2019): 123. http://dx.doi.org/10.17146/eksplorium.2018.39.2.4982.

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ABSTRAK Alumina waste dari tailing bauksit merupakan produk samping yang berasal dari hasil benefisiasi bijih bauksit. Proses benefisiasi dilakukan dengan cara memisahkan partikel-partikel yang ada seperti lumpur atau clay, akar-akar, butiran bijih bauksit berkisar 2 mm yang dibuang atau menjadi waste product atau disebut sebagai limbah tailing. Tingginya kadar alumina dan silika dalam tailing bauksit menjadi salah satu alasan mengapa tailingini dapat dimanfaatkan sebagai bahan dasar dalam pembuatan produk baru yaitu zeolit sintetis. Zeolit sintetis dipilih karena zeolit merupakan produk impor

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Suwannaboot, Napasakorn, Napasorn Jangkakul, Yada Thamjariyawat, et al. "EXTRACTION OF SILICA FROM SUGARCANE LEAVES FOR SYNTHESIS OF ZEOLITE AS ETHYLENE ADSORBENT TO PRESERVE FRESH FRUIT." Suranaree Journal of Science and Technology 30, no. 2 (2023): 030099(1–6). http://dx.doi.org/10.55766/sujst-2023-02-e02059.

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Sugarcane is widely grown in the Northeastern region of Thailand. The sugarcane leaves are usually eliminated before harvesting by burning, producing PM 2.5 as air pollutant. Here, we explore an approach to produce high-purity silica from the sugarcane leaves by leaching with hydrochloric acid (2.0 M) and subsequent calcination at 500°C for 4 h. The obtained silica is in an amorphous phase. The silica purity is 83.4 ± 0.9 wt.%, better than the product without acid leaching (18.5 ± 0.2 wt.%). Then, the silica was used in the synthesis of zeolite by hydrothermal method. The obtained zeolite has

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Sharma, Pankaj, Moon Hee Han, and Churl-Hee Cho. "Synthesis of Zeolite Nanomolecular Sieves of Different Si/Al Ratios." Journal of Nanomaterials 2015 (2015): 1–9. http://dx.doi.org/10.1155/2015/912575.

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Nanosized zeolite molecular sieves of different Si/Al ratios have been prepared using microwave hydrothermal reactor (MHR) for their greater application in separation and catalytic science. The as-synthesized molecular sieves belong to four different type zeolite families: MFI (infinite and high silica), FAU (moderate silica), LTA (low silica and high alumina), and AFI (alumina rich and silica-free). The phase purity of molecular sieves has been assessed by X-ray diffraction (XRD) analysis and morphological evaluation done by electron microscopy. Broad XRD peaks reveal that each zeolite molecu

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Qaid, Ali M. "Integration of Geological, Geochemical, Mineralogical and Remote Sensing Data for Studying Zeolite Deposits of Al-Ahyuq-Taiz, Yemen." International Journal for Research in Applied Science and Engineering Technology 9, no. 9 (2021): 1827–41. http://dx.doi.org/10.22214/ijraset.2021.37959.

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Abstract: Zeolite deposits crop out at Al-Ahyuq area, and lies at about 89 km southwest of Taiz city. It is one of the most important zeolite localities in Yemen. The study area is covered by the Yemen volcanic group. X-Ray Diffraction (XRD) analyses showed that clinoptilolite is the major type of Al-Ahyuq zeolites with high purity. Chemical analysis shows that the studied zeolitic tuff samples have silica content ranging from 63.10 wt% - 71.1wt% with an average 68.69 wt%, Fe2O3 [as total iron] with an average 2.38wt%, MgO with an average 0.44 wt% and TiO2 with an average 0.17wt%. These chemic

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30

YOSHIDA, Akira. "Synthesis of high-silica zeolite Y." NIPPON KAGAKU KAISHI, no. 2 (1991): 110–19. http://dx.doi.org/10.1246/nikkashi.1991.110.

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Liu, Zhanjun, Chenxi Shi, Dan Wu, Shixuan He, and Bo Ren. "A Simple Method of Preparation of High Silica Zeolite Y and Its Performance in the Catalytic Cracking of Cumene." Journal of Nanotechnology 2016 (2016): 1–6. http://dx.doi.org/10.1155/2016/1486107.

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A series of high silicon zeolites Y were prepared through direct synthetic method by using silica sol as the silicon source and sodium aluminate as the aluminum source. The effects of alkalinity and crystallization time of the process of synthesis were investigated. To separately reveal the crystalline structure, element content, morphology, and surface areas, the as-synthesized zeolite Y was characterized by powder X-ray diffraction (XRD), X-ray fluorescence (XRF), scanning electron microscopy (SEM), and N2adsorption-desorption isotherms (BET). The results show the as-synthesized zeolite Y wi

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Silva, I. da, A. O. S. Silva, J. R. Santos, R. C. S. Nascimento, J. M. Ferreira, and A. D. Rodrigues. "Catalytic conversion of glucose in fructose utilizing high-silica zeolite Sn-ZSM-12." Cerâmica 66, no. 379 (2020): 221–28. http://dx.doi.org/10.1590/0366-69132020663792867.

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Abstract Tin incorporation in high-silica ZSM-12 zeolite was evaluated using different concentrations of tin and different structure-directing agents (SDA), in order to be used in the glucose isomerization reaction in fructose. The tetraethylammonium hydroxide SDA successfully formed the structure of the high silica zeolite ZSM-12; however, in this system, the addition of Sn prevented the formation of the ZSM-12 zeolite. Therefore, tetraethylammonium bromide was used as SDA, but the syntheses of high-silica ZSM-12 zeolite without and with tin incorporation were not effective. Then methyltrieth

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Liang, Li, Meihua Zhu, Le Chen, et al. "Single Gas Permeance Performance of High Silica SSZ-13 Zeolite Membranes." Membranes 8, no. 3 (2018): 43. http://dx.doi.org/10.3390/membranes8030043.

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Continuous and high silica SSZ-13 zeolite membranes were prepared on porous mullite supports from high SiO2/Al2O3 ratio or aluminum-free precursor synthesis gel. Single gas permeance (CO2 and CH4) of the high silica SSZ-13 zeolite membrane was decreased with the SiO2/Al2O3 ratio in the precursor synthesis gel, while the ideal CO2/CH4 selectivity of the membrane was gradually increased. Moreover, effects of synthesis conditions (such as H2O/SiO2 and RNOH/SiO2 ratios of precursor synthesis gel, crystallization time) on the single gas permeance performance of high silica SSZ-13 zeolite membranes

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Sundari, Citra Deliana Dewi, Soni Setiadji, Yusuf Rohmatullah, et al. "Synthesis of zeolite L using rice husk ash silica for adsorption of methylene blue: kinetic and adsorption isotherm." MATEC Web of Conferences 197 (2018): 05002. http://dx.doi.org/10.1051/matecconf/201819705002.

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Rice husk has a high silica content, so it can be utilized as silica source for zeolite synthesis. In this research, synthesis of zeolite L has been done using silica from rice husk ash without organic template. The synthesized zeolite L is then used as an adsorbent to adsorb methylene blue dye. The steps of zeolite L synthesis include: silica extraction from rice husk ash using NaOH and zeolite L synthesis using hydrothermal method with molar ratio 10 SiO2: Al2O3: 4 K2O: 100 H2O at 170°C for 24 hours. The resulting Zeolite L was then characterized by XRD and SEM. The absorption capacity of me

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Fernandes, A. A., E. U. C. Frajndlich, and Humberto Gracher Riella. "A Low Cost ZSM-5 Zeolite Obtained from Rice Hull Ash." Materials Science Forum 498-499 (November 2005): 676–80. http://dx.doi.org/10.4028/www.scientific.net/msf.498-499.676.

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The high pure synthetic zeolite have a large application in industry and agriculture, being nowadays in majority imported in Brazil. The biomass like rice hull ash (RHA), a rice industry waste, can be real advantageous in manufacture of different materials, since that is produced in large scale in the country. The silica extraction from RHA by alkaline leaching is a low energetic coast process and high efficiency, obtaining high pure silica with high reactive amorphous structure, very interesting for zeolite production. In this work was developed a economically feasible route for the productio

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Tuter, Rukiye, Cem Baccioglu, Cansel Ozkan, and Leyla Tanacan. "A Research on Developing Zeolite Based Lime Mortars." MATEC Web of Conferences 403 (2024): 03001. http://dx.doi.org/10.1051/matecconf/202440303001.

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Zeolites are aluminosilicate materials that possess a crystalline structure characterized by an interlinked three-dimensional framework of AlO4 and SiO4 tetrahedra. This framework contains open cavities in the form of channels and cages, leading to the designation of zeolites as molecular sieves. The characteristics of molecular sieves enable zeolites to have high adsorption capacity, ion exchange capability, and catalytic properties, which also contribute to improving indoor environmental quality. Zeolites also exhibit pozzolanic reactivity due to their high silica content. These chemical and

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Lao-Ubol, Supranee, Phunthinee Somwongsa, Pracha Laoauyporn, Pasinee Panith, Siriporn Larpkiattaworn, and Shih Yuan Chen. "Effect of Silica Base Catalyst on Transformation of Methanol to Hydrocarbon." Key Engineering Materials 751 (August 2017): 512–17. http://dx.doi.org/10.4028/www.scientific.net/kem.751.512.

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Five different types of silica catalyst (SBA-15, SBA-15-PO3H2, and three different Si/Al ratio of commercial zeolites (30, 80 and 280) were used to study the transformation of methanol to hydrocarbon (MTH). The aim of this study was to investigate the effect of pore diameter and acidity in the structure of silica catalysts on the process performances in terms of methanol conversion and hydrocarbon selectivity. The mesoporous silica catalysts were prepared by co-condensation method. The catalysts samples were characterized by GC-MS, XRD, BET, and NH3-TPD techniques. The catalytic performance of

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Asgar Pour, Zahra, and Khaled O. Sebakhy. "A Review on the Effects of Organic Structure-Directing Agents on the Hydrothermal Synthesis and Physicochemical Properties of Zeolites." Chemistry 4, no. 2 (2022): 431–46. http://dx.doi.org/10.3390/chemistry4020032.

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The study on the synthesis of zeolites, including both the development of novel techniques of synthesis and the discovery of new zeolitic frameworks, has a background of several decades. In this context, the application of organic structure-directing agents (SDAs) is one of the key factors having an important role in the formation of porous zeolitic networks as well as the crystallization process of zeolites. There are various elements that are needed to be explored for elucidating the effects of organic SDAs on the final physicochemical properties of zeolites. Although SDAs were firstly used

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Babyak, Ludmila, Olexandra Matsyak, Vasyl Shevchuk, Bao Tan Phan, and Duc Trung Truong. "C2–C4 Alkenes Conversion over ZVM+2 % Zn High-Silica Zeolite Catalyst at High Volumetric Flow Rates." Chemistry & Chemical Technology 3, no. 4 (2009): 305–7. http://dx.doi.org/10.23939/chcht03.04.305.

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C2–C4 alkenes conversion over high-silica zeolite catalyst modified with 2 mas % of Zn has been investigated at the laboratory plant of flow type within temperatures ranges of 723–773 K and volumetric flow rates 1000–30000 h-1. It has been shown that a propylene high conversion and high yield of liquid catalizate containing lower arenes are achieved at space velocities of 20000 h-1.

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Meng, Qing Yang, Jin Yang Chen, Xiao Wei Cheng, and Ying Cai Long. "Fast Synthesis of High-Silica ZSM-5 Zeolite via a Simple Vapor-Phase Transport Method." Advanced Materials Research 634-638 (January 2013): 2184–88. http://dx.doi.org/10.4028/www.scientific.net/amr.634-638.2184.

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Fast synthesis of high-silica ZSM-5 zeolite through vapor-phase transport (VPT) method was reported in this paper. The synthesized samples were characterized with XRD, FT-IR, XRF, SEM and N2 Absorption. Factors affecting the synthesis of ZSM-5 zeolite such as the alkalinity, the crystallization temperature and time, the quantity of seeds were investigated. With precipitated silica and fumed silica as silica source respectively, the appropriate ratio was studied as follows: (0.04-0.05) Na2O: 1.0SiO2: 15H2O: (0-0.0046)Al2O3: 0.01Seed, the reaction was carried out at 393-413K for 4-24h.

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Zhuman, Botagoz, Shaheen Fatima Anis, Saepurahman, Gnanapragasam Singravel, and Raed Hashaikeh. "Catalytic Cracking of n-Hexadecane Using Carbon Nanostructures/Nano-Zeolite-Y Composite Catalyst." Catalysts 10, no. 12 (2020): 1385. http://dx.doi.org/10.3390/catal10121385.

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Zeolite-based catalysts are usually utilized in the form of a composite with binders, such as alumina, silica, clay, and others. However, these binders are usually known to block the accessibility of the active sites in zeolites, leading to a decreased effective surface area and agglomeration of zeolite particles. The aim of this work is to utilize carbon nanostructures (CNS) as a binding material for nano-zeolite-Y particles. The unique properties of CNS, such as its high surface area, thermal stability, and flexibility of its fibrous structure, makes it a promising material to hold and bind

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Leardini, L., A. Martucci, I. Braschi, S. Blasioli, and S. Quartieri. "Regeneration of high-silica zeolites after sulfamethoxazole antibiotic adsorption: a combined in situ high-temperature synchrotron X-ray powder diffraction and thermal degradation study." Mineralogical Magazine 78, no. 5 (2014): 1141–59. http://dx.doi.org/10.1180/minmag.2014.078.5.04.

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AbstractThe thermal regeneration of sulfamethoxazole (SMX)-loaded Y and ZSM-5 zeolites was studied using a combined in situ high-temperature synchrotron X-ray powder diffraction and thermal degradation study. The evolution of the structural features was monitored in real time in the 30–575°C temperature range by full-profile Rietveld analysis. SMX thermal degradation pathways into high-silica zeolite antibiotic adducts, as well as the release of evolved species are similar to those for pure SMX. The adsorption/desorption process occurs without any significant loss of zeolite crystallinity, tho

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Setiadji, Soni, Citra Deliana Dewi Sundari, Endang Lala, et al. "The increased use value of bamboo leaves as silica source for t-type zeolite synthesis." MATEC Web of Conferences 197 (2018): 05003. http://dx.doi.org/10.1051/matecconf/201819705003.

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T-type zeolite can be used as catalyst, adsorbent, and membranes for gas separation. The synthesis of T-type zeolite needs to be optimized in both of the method and source of precursor, because of its relatively high price. In this research, the synthesis is done using silica extracted from bamboo leaves instead of commercial silica. This increases the value of the bamboo leaves and the cost-performance of zeolite synthesis. The silica was extracted from bamboo leaves ash using alkaline solvent. The extracted silica has 81.76% of purity and an amorphous phase. The T-type zeolite was synthesize

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Liu, Hanbang, Danhua Yuan, Guangye Liu, Jiacheng Xing, Zhongmin Liu, and Yunpeng Xu. "Oxygen-selective adsorption on high-silica LTA zeolite." Chemical Communications 56, no. 75 (2020): 11130–33. http://dx.doi.org/10.1039/d0cc04484a.

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Beving, Derek E., Andrew M. P. McDonnell, Weishen Yang, and Yushan Yan. "Corrosion Resistant High-Silica-Zeolite MFI Coating." Journal of The Electrochemical Society 153, no. 8 (2006): B325. http://dx.doi.org/10.1149/1.2207845.

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Chauke, Nyiko M., Richard M. Moutloali, and James Ramontja. "Influence of the Zeolite ZSM-22 Precursor on a UF-PES Selective Substrate Layer for Salts Rejection." Membranes 12, no. 6 (2022): 553. http://dx.doi.org/10.3390/membranes12060553.

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Fabrication of the ZSM-22/Polyethersulfone (ZSM-22/PES) membranes as selective salt filters represent a growing membrane technological area in separation with the potential of high economic reward based on its low energy requirements. The incorporation of ZSM-22 zeolite material as additives into the PES polymer matrix has the prospective advantage of combining both the zeolite and polymer features while overcoming the limitations associated with both materials. This work investigated the influence of the nature of the silica precursor on ZSM-22 zeolite hydrothermally synthesised using colloid

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Carmo, José Vitor C., Joabson Nogueira, Gabriela M. Bertoldo, et al. "Porous Nanostructured Catalysts Based on Silicates and Their Surface Functionality: Effects of Silica Source and Metal Added in Glycerol Valorization." Catalysts 14, no. 8 (2024): 526. http://dx.doi.org/10.3390/catal14080526.

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A series of nanospherical-shaped silicates containing heteroatoms (Al, Zr or Ti) were successfully synthesized using tetraethylorthosilicate (TEOS) or silica colloids as a silicon source. These metallosilicate nanospheres were used as silicon nutrients to obtain silicalite zeolites with micro-mesoporosity and improved textural properties. The results demonstrated that TEOS acted as a suitable silicon source to produce amorphous silicates and a spherical-type zeolite architecture with Zr and Ti heteroatoms included in their framework, with preferable particle size and crystallinity. The surface

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Barbosa, Antusia dos Santos, and Meiry Gláucia Freire Rodrigues. "Synthesis of NaA Zeolite: Conventional Route and Green Route." Catalysis Research 04, no. 01 (2024): 1–16. http://dx.doi.org/10.21926/cr.2401002.

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The research describes a sustainable approach for the synthesis of zeolite NaA using kaolin as an alternative source of silica. The main objective of this research was to prepare NaA zeolite using metakaolin derived from kaolin from the state of Rio Grande do Norte, Brazil, as an alternative source of silica, reducing the production cost and evaluating its thermal stability. In addition, a study of the thermal stability of the zeolite and cost estimates for zeolite production were carried out. Traditional methods of zeolite synthesis, mainly through hydrothermal processes, are often associated

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Li, Yaojie, Bo Qin, Wenming Hao, Yanze Du, Jinghong Ma, and Ruifeng Li. "Protolytic Ring-Opening Cracking of Methylcyclohexane over Hierarchical High-Silica USY Zeolite: A Haag-Dessau Cracking." Catalysts 12, no. 7 (2022): 697. http://dx.doi.org/10.3390/catal12070697.

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To reveal the influence of acid sites with different spatial locations of USY zeolite with different micro-/mesoporous structures and Si/Al ratio, catalytic cracking of methylcyclohexane on the zeolites is employed to study the synergism effects of acid sites and porous structures (“active region”) in the hierarchical USY zeolites. The results showed that the hierarchical USY zeolites have increased numbers of accessibly strong Brønsted acid sites and greatly enhanced diffusion ability due to the hierarchical pore-structure, resulting in mainly monomolecular protolytic scission in cracking rea

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Lin, Zheng Sonia, and Yining Huang. "Syntheses of high-silica zeolites in urea/choline chloride deep eutectic solvent." Canadian Journal of Chemistry 94, no. 6 (2016): 533–40. http://dx.doi.org/10.1139/cjc-2016-0115.

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This paper presents the first example of high-silica and siliceous zeolite synthesis in the urea/choline chloride mixture as a deep eutectic solvent (DES) using F– as the mineralizing agent. A urea/choline chloride mixture was previously used as solvent to prepare AlPO4-based microporous materials SIZ-2 and AlPO-CJ2. However, generating these materials depends on the formation of ammonium ion as a structure-directing agent (SDA) that is the side product of urea decomposition. In the present study, we show that several highly siliceous zeolites with targeted topologies (MFI, BEA, MEL, and MTN)

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