Готові списки джерел за темами / FAU and MFI structural type zeolites / Статті в журналах
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Статті в журналах з теми "FAU and MFI structural type zeolites"

Автор: Grafiati
Опубліковано: 23 вересня 2022
Оновлено: 28 січня 2023

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1

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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Анотація:
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 CHA zeolites were also produced successfully using a mixture of TMAda with a number of less expensive organic structure-directing agents. The CHA zeolite materials have been synthesized with high crystallinity and with a Si/Al ratio ranging from 5 to 140. Our data support the importance of structural similarity between the zeolite precursors, nucleation/crystallization processes, and the zeolite product in the interzeolite conversion compared to conventional amorphous aluminosilicate gels. Our synthetic methods could be used to prepare other 8-membered ring zeolites such as AEI and AFX frameworks, potential candidates for selective catalytic reduction of NOx, light olefin production, and CO2 abatement.
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2

De Waele, Vincent, Abdelhafid Souici, Ka-Lun Wong, Svetlana Mintova та Mehran Mostafavi. "γ-Radiolysis preparation of nanometer-sized cadmium sulphide quantum dots stabilized in nanozeolite X and ZSM-5". New Journal of Chemistry 42, № 7 (2018): 5465–70. http://dx.doi.org/10.1039/c8nj00730f.

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3

Astafan, Amir, Alexander Sachse, Catherine Batiot-Dupeyrat, and Ludovic Pinard. "Impact of the Framework Type on the Regeneration of Coked Zeolites by Non-Thermal Plasma in a Fixed Bed Dielectric Barrier Reactor." Catalysts 9, no. 12 (November 24, 2019): 985. http://dx.doi.org/10.3390/catal9120985.

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The formation of coke as a result of propene transformation at 623 K on zeolites results from a product shape selectivity mechanism of which the products are polyaromatic molecules, such as pyrene on MFI, anthracene on MOR, pyrene and coronene on FAU. Zeolite regeneration can be achieved by using non-thermal plasma (NTP), with decreased energy consumption, employing a fixed bed dielectric barrier reactor. The efficiency of this alternative regeneration process depends on the coke toxicity. On MFI and FAU (featuring three-dimensional 10 and 12 ring channel systems, respectively) coking occurs by poisoning the Brønsted acid sites; on MOR, (presenting a one-dimensional 12 ring channel system) pore blocking takes place, leading to higher coke toxicity. A complete coke removal is achieved on MFI and FAU zeolites using NTP within 3 h, while for MOR coke, removal proceeds slower and is incomplete after 3 h on stream. Hence, the efficiency of regeneration is impacted by the accessibility of active oxygenated species generated under plasma (e.g., O*, O2+) to coke molecules.
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4

Navlani-García, Miriam, Izaskun Miguel-García, Ángel Berenguer-Murcia, Dolores Lozano-Castelló, Diego Cazorla-Amorós, and Hiromi Yamashita. "Pd/zeolite-based catalysts for the preferential CO oxidation reaction: ion-exchange, Si/Al and structure effect." Catalysis Science & Technology 6, no. 8 (2016): 2623–32. http://dx.doi.org/10.1039/c5cy02044a.

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Анотація:
A screening of Pd/zeolite-based catalysts in the PrOx-CO reaction in H2-rich streams was performed using zeolites with different cations (H+, Na+ and Cs+) prepared by ion exchange and framework type (MFI and FAU).
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5

Ai-Jie, Han, Zeng Yu, Guo Juan, Huang Yue-Fang, He He-Yong, and Long Ying-Cai. "Interaction of Methylamine with Highly Siliceous MFI, FAU and FER-type Zeolites." Chinese Journal of Chemistry 23, no. 4 (April 2005): 413–17. http://dx.doi.org/10.1002/cjoc.200590413.

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6

Schoofs, Bart, Johan A. Martens, Pierre A. Jacobs, and Robert A. Schoonheydt. "Kinetics of Hydrogen–Deuterium Exchange Reactions of Methane and Deuterated Acid FAU- and MFI-Type Zeolites." Journal of Catalysis 183, no. 2 (April 1999): 355–67. http://dx.doi.org/10.1006/jcat.1999.2401.

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7

Morales-Pacheco, P., F. Alvarez, L. Bucio, and J. M. Domínguez. "Synthesis and Structural Properties of Zeolitic Nanocrystals II: FAU-Type Zeolites." Journal of Physical Chemistry C 113, no. 6 (January 20, 2009): 2247–55. http://dx.doi.org/10.1021/jp8070713.

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8

Tang, Ke, Xin Hong, and Jin Gang Qi. "Carbon Nanotube Templated Growth of the Nano-Crystalline NaY Zeolite." Advanced Materials Research 194-196 (February 2011): 594–97. http://dx.doi.org/10.4028/www.scientific.net/amr.194-196.594.

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Анотація:
FAU-type(NaY) zeolites nanocrystals have been synthesized through crystallization of gel in mesoporous system of carbon nanotubes(CNTS) with a internal diameter of 20~30 nm. Investigation by using X-ray diffraction (XRD), Fourier transform infrared (FT-IR), transmission electron microscope (TEM) shows that the nanocrystals possess the typical nanosized zeolites structural characteristics which is different from those of microsized zeolites.
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9

Migliardini, Fortunato, Fabio Iucolano, Domenico Caputo, and Pasquale Corbo. "MFI and FAU-Type Zeolites as Trapping Materials for Light Hydrocarbons Emission Control at Low Partial Pressure and High Temperature." Journal of Chemistry 2015 (2015): 1–11. http://dx.doi.org/10.1155/2015/269694.

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Анотація:
The adsorption of light hydrocarbons (C2–C5 olefins and paraffins, toluene) on HZSM-5, silicalite, and HY was studied for application in treatment of exhaust streams of the petrochemical industry and of vehicles under cold start conditions. At this aim the trapping capability was evaluated on hydrated zeolites by breakthrough curves at low hydrocarbon partial pressure (0-1 kPa), in the temperature range 298–523 K and at space velocity of 30000 h−1. The basic adsorption properties of materials were also verified for three selected hydrocarbons (ethylene, isobutene, and toluene) by equilibrium isotherms on dehydrated zeolites at 298 K. The role of physicochemical characteristics of adsorbent materials was discussed in relation with their trapping capability of different types of hydrocarbons.
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10

Hu, Guang, Xu Duan, Jian Yang, Chen Yang, Qingcai Liu, Shan Ren, Jiangling Li, Liumei Teng, and Weizao Liu. "A novel conversion of Ti-bearing blast furnace slag into Ti-containing zeolites: Comparison study between FAU and MFI type zeolites." Advanced Powder Technology 33, no. 5 (May 2022): 103559. http://dx.doi.org/10.1016/j.apt.2022.103559.

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11

Morales-Pacheco, P., F. Alvarez-Ramirez, P. Del Angel, L. Bucio, and J. M. Domínguez. "Synthesis and Structural Properties of Zeolytic Nanocrystals I. MFI Type Zeolites." Journal of Physical Chemistry C 111, no. 6 (February 2007): 2368–78. http://dx.doi.org/10.1021/jp064780v.

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12

Xu, Xiao-Wen, Jing Wang, and Ying-Cai Long. "Forming and Gathering of SnO2 Nanoparticles on External Surface of High Silica TON, MFI and FAU Type Zeolites." Chinese Journal of Chemistry 24, no. 12 (December 2006): 1725–30. http://dx.doi.org/10.1002/cjoc.200690323.

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13

Vezzalini, Giovanna, Rossella Arletti, and Simona Quartieri. "High-pressure-induced structural changes, amorphization and molecule penetration in MFI microporous materials: a review." Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials 70, no. 3 (May 24, 2014): 444–51. http://dx.doi.org/10.1107/s2052520614008014.

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Анотація:
This is a comparative study on the high-pressure behavior of microporous materials with an MFI framework type (i.e.natural mutinaite, ZSM-5 and the all-silica phase silicalite-1), based onin-situexperiments in which penetrating and non-penetrating pressure-transmitting media were used. Different pressure-induced phenomena and deformation mechanisms (e.g.pressure-induced over-hydration, pressure-induced amorphization) are discussed. The influence of framework and extra-framework composition and of the presence of silanol defects on the response to the high pressure of MFI-type zeolites is discussed.
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14

Mancinelli, Maura, Antonella Arfè, Annalisa Martucci, Luisa Pasti, Tatiana Chenet, Elena Sarti, Giulia Vergine, and Claudia Belviso. "Evaluation for the Removal Efficiency of VOCs and Heavy Metals by Zeolites-Based Materials in the Wastewater: A Case Study in the Tito Scalo Industrial Area." Processes 8, no. 11 (November 22, 2020): 1519. http://dx.doi.org/10.3390/pr8111519.

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Анотація:
The current study was designed to demonstrate the efficiency of selected zeolites in the immobilization of heavy metals and volatile organic compounds from water in the industrial area of Tito Scalo (Basilicata Region in Southern Italy). The efficiency of zeolite materials has been evaluated by analyzing real water samples, by a multi-technique approach. Gas chromatography (GC) and inductively coupled plasma optical emission spectrometry (ICP-OES) were selected for the detection of volatile organic compounds (VOCs) and heavy metals respectively, and then by thermal analysis (TG, DTA) and X-ray powder diffraction (XRD) to verify the presence of contaminants in the structural channels of the adsorbents. ZSM-5 zeolite (MFI topology) was suitable for volatile organic compounds, showing removal efficiencies 87%. 13X (FAU topology) was more selective for in situ abatements of heavy metals, with efficiencies up to 100%. After VOCs and heavy metals removal, structure refinements of loaded zeolites highlighted variations of both lattice parameters and extraframework content confirming the pollutants immobilization in the framework microporosities. The occurrence of these species was also confirmed by DTA curves showing different phenomena explained on the basis of the nature and number of extraframework species hosted in the zeolite micropores.
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15

LU, YI, NAI-QIAN ZHANG, QIN TONG, JIN-KU LIU, and DAN-JING HONG. "NANOSEEDING EFFECT IN ZSM-5 CRYSTALLIZATION PROCESS." Nano 08, no. 03 (May 30, 2013): 1350027. http://dx.doi.org/10.1142/s1793292013500276.

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Анотація:
ZSM-5 zeolites were hydrothermally synthesized in three different seeding pathways under the direction of tetrapropylammonium bromide (TPABr) template. In order to investigate the seeding effect in ZSM-5 crystallization process, ZSM-5 crystals and pre-fabricated MFI-type nanoseeds were added into the original self-induction system, respectively. The final ZSM-5 zeolites were systematically investigated based on XRD (X-ray diffraction), SEM (scanning electron micrograph), TEM (transmission electron micrograph), nitrogen adsorption characterizations and NH3 -TPD (ammonia-temperature programmed desorption). The self-induction system produced ca. 20 μm ZSM-5 zeolite displaying hexagonally uniform prisms. After the addition of ZSM-5 crystal seeds, the crystal sizes were decreased greatly to ca. 5 μm. When MFI-type nanoseeds were adopted, irregular aggregate particles consisting of 20–50 nm primary particles were rapidly synthesized. The varied hydrothermal crystallization kinetics of the three synthesis system was also explored. Adjusting the seed agents alone, ZSM-5 crystals with diverse structural, morphological, textural and hydrothermal behaviors could be fabricated conveniently. The three ZSM-5 zeolites loaded by 0.05 wt.% Pt were assessed for the xylene isomerization reaction to investigate the particle size effect on the catalytic properties.
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16

Porcher, Florence, Mohamed Souhassou, and Claude Lecomte. "X-ray and neutron scattering: from ideal zeolites to real guest-host systems." Acta Crystallographica Section A Foundations and Advances 70, a1 (August 5, 2014): C1254. http://dx.doi.org/10.1107/s2053273314087452.

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Анотація:
Tetrahedral MOFs, microporous metallophosphates and zeolites share common framework topologies despite very different chemical nature of their crystalline skeleton. In the case of zeolites or metallophosphates, the polymeric [TO2]_ framework is based on single tetrahedral atoms T (T= Si4+/Al3+ or Ga3+/B3+/P5+ respectively) connected by corner oxygen atoms O. In the case of MOFs, the skeleton is built from supertetraedra formed by a central metal atom complexed by 4 organic linkers (terephtalate,...); hence homologous structures expanded by a "scale factor". In "molecular sieves", the static porosity but also the "breathing effect" control, in first approximation, the adsorption and the self-diffusion of guest molecules. These latter are finely tuned by the interaction of these molecules with the framework itself (though H-bonds or electrostatic interactions), with charge compensating cations in basic zeolites (through coulombic interaction), or with other adsorbed molecules. However, the interplay between guest molecule adsorption, framework relaxation, cation redistribution and atomic charge transfer leads to an inextricable problem for the modeling and prediction of adsorption properties in these systems in absence of any polarizable and adaptive force field. We will present experimental charge density studies on activated industrial zeolites FAU, MFI and MOR. The electrostatic properties derived on these systems (electric field, atomics charges) are validated by a comparison with those derived, experimentally and theoretically, on a comprehensive set of simpler quartz-type materials (SiO2, AlPO4, GaPO4,...) representative of typical microporous compositions. Finally, we will combine the informations brought by diffraction, diffuse scattering and Monte-Carlo modelling to analyse the adsorption process or the role of the template in the stabilisation of the framework in these systems and in the famous MIL-53 MOF
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17

Mercury, M., R. Denoyel, A. Simon-Masseron, M. Carette, Y. Zerega, J. Patarin, M. Soulard, C. Reynard, and A. Janulyte. "Selective adsorption of 2,3-DCDD and 1,2,3,4-TCDD on *BEA, EMT, FAU and MFI-type zeolites as alternative adsorbents for on-line dioxin monitoring." Adsorption 17, no. 4 (March 24, 2011): 747–58. http://dx.doi.org/10.1007/s10450-011-9349-z.

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18

Tang, Ke, and Xin Hong. "Carbon Nanotube Templated Growth of Nano-Crystallinity ZSM-5." Advanced Materials Research 299-300 (July 2011): 1020–23. http://dx.doi.org/10.4028/www.scientific.net/amr.299-300.1020.

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Анотація:
MFI-type(ZSM-5) zeolite nanocrystals with SiO2/Al2O3ratios of 100 has been synthesized through crystallization of gel in mesoporous system of carbon nanotubes(CNTS) with internal diameter of 20~30nm. Investigation by using X-ray diffraction (XRD), Fourier transform infrared (FT-IR), transmission electron microscope (TEM) and scanning electron microscope (SEM) shows that the nanocrystals possess the typical nanosized zeolites structural characteristics which is different from those of microsized zeolites. Compared with those of the corresponding sample synthesized in hydrothermal system, the bands of the nanosized sample are shifted slightly to lower or higher wavenumbers. The TEM images of the purified carbon nanotubes and nanosized ZSM-5 crystals after the removal of the carbon matrix suggest that clean and homogeneous carbon nanotubes have internal diameters of approximately 20~30 nm and the most crystal sizes are in the range 30~60nm. The SEM photograph verifies the existing of nanosized ZSM-5.
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19

Osewe, Elly Tety, Victor Shikuku, Cristiane A. Pereira, Stephen O. Otieno, and Audrey Okoyo. "Effects of Different Types of Zeolites on the Degradation Kinetics of Malathion Pesticide in Water." Chemical Science International Journal, June 15, 2021, 38–49. http://dx.doi.org/10.9734/csji/2021/v30i430228.

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Анотація:
The study examined the effects of selected types of zeolites as an environmentally benign and friendly way to degrade, S-1, 2-bis (ethoxycarbonyl) ethyl O, O-dimethylphosphorodithioate (malathion), used as a model pesticide, from river water. The effect of the size of zeolite channels and dimensionality (such as 1D, 2D, and 3D), Si/Al ratio, and operating pH were studied to find a suitable type of zeolite and conditions to optimize the pesticide degradation. Mordenite (MOR (1D): Si/Al=6.83, and Si/Al=10.72), ferrierite (FER (2D): Si/Al=10.71), ZSM-5 (MFI (3D): Si/Al=6.83 and Si/Al=10.72) and USY (FAU (3D): Si/Al=2.77) zeolites were individually mixed with a water sample collected from Monjolinho River in São Carlos (SP), Brazil and the degradation trend studied. The results showed that all the zeolites accelerated the degradation of malathion. Nevertheless, lower zeolite Si/Al ratio and larger 3D channels or cavities had a positive influence on the degradation rate. The FAU zeolite presented the stronger degradation of the malathion with a half-life of 16.5 followed by ZSM-5 with 24.8, ferrierite with 29.7, and finally mordenite with 30.3 hours.
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20

Ohyama, Junya, Airi Hirayama, Nahoko Kondou, Hiroshi Yoshida, Masato Machida, Shun Nishimura, Kenji Hirai, Itsuki Miyazato, and Keisuke Takahashi. "Data science assisted investigation of catalytically active copper hydrate in zeolites for direct oxidation of methane to methanol using H2O2." Scientific Reports 11, no. 1 (January 22, 2021). http://dx.doi.org/10.1038/s41598-021-81403-4.

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Анотація:
AbstractDozens of Cu zeolites with MOR, FAU, BEA, FER, CHA and MFI frameworks are tested for direct oxidation of CH4 to CH3OH using H2O2 as oxidant. To investigate the active structures of the Cu zeolites, 15 structural variables, which describe the features of the zeolite framework and reflect the composition, the surface area and the local structure of the Cu zeolite active site, are collected from the Database of Zeolite Structures of the International Zeolite Association (IZA). Also analytical studies based on inductively coupled plasma-optical emission spectrometry (ICP-OES), X-ray fluorescence (XRF), N2 adsorption specific surface area measurement and X-ray absorption fine structure (XAFS) spectral measurement are performed. The relationships between catalytic activity and the structural variables are subsequently revealed by data science techniques, specifically, classification using unsupervised and supervised machine learning and data visualization using pairwise correlation. Based on the unveiled relationships and a detailed analysis of the XAFS spectra, the local structures of the Cu zeolites with high activity are proposed.
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