Log in

Relevant bibliographies by topics / High silica LTA zeolite / Journal articles

Journal articles on the topic 'High silica LTA zeolite'

To see the other types of publications on this topic, follow the link: High silica LTA zeolite.

Author: Grafiati

Published: 10 December 2022

Last updated: 29 January 2023

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'High silica LTA zeolite.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

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.

Full text

Abstract:

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 molecular sieve sample is composed of nanocrystallites. Scanning electron microscopic images feature the notion that the incorporation of aluminum to MFI zeolite synthesis results in morphological change. The crystals of pure silica MFI zeolite (silicalite-1) have hexagon lump/disk-like shape, whereas MFI zeolite particles with Si/Al molar ratios 250 and 100 have distorted hexagonal lump/disk and pseudo spherical shapes, respectively. Furthermore, phase pure zeolite nanocrystals of octahedron (FAU), cubic (LTA), and rod (AFI) shape have been synthesized. The average sizes of MFI, FAU, LTA, and AFI zeolite crystals are 250, 150, 50, and 3000 nm, respectively. Although the length of AFI zeolite rods is in micron scale, the thickness and width are of a few nanometers.

APA, Harvard, Vancouver, ISO, and other styles

3

Beving, Derek E., Cory R. O’Neill, and Yushan Yan. "Hydrophilic and antimicrobial low-silica-zeolite LTA and high-silica-zeolite MFI hybrid coatings on aluminum alloys." Microporous and Mesoporous Materials 108, no. 1-3 (February 2008): 77–85. http://dx.doi.org/10.1016/j.micromeso.2007.03.029.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Gao, Feng. "Fe-Exchanged Small-Pore Zeolites as Ammonia Selective Catalytic Reduction (NH3-SCR) Catalysts." Catalysts 10, no. 11 (November 14, 2020): 1324. http://dx.doi.org/10.3390/catal10111324.

Full text

Abstract:

Cu-exchanged small-pore zeolites have been extensively studied in the past decade as state-of-the-art selective catalytic reduction (SCR) catalysts for diesel engine exhaust NOx abatement for the transportation industry. During this time, Fe-exchanged small-pore zeolites, e.g., Fe/SSZ-13, Fe/SAPO-34, Fe/SSZ-39 and high-silica Fe/LTA, have also been investigated but much less extensively. In comparison to their Cu-exchanged counterparts, such Fe/zeolite catalysts display inferior low-temperature activities, but improved stability and high-temperature SCR selectivities. Such characteristics entitle these catalysts to be considered as key components of highly efficient emission control systems to improve the overall catalyst performance. In this short review, recent studies on Fe-exchanged small-pore zeolite SCR catalysts are summarized, including (1) the synthesis of small-pore Fe/zeolites; (2) nature of the SCR active Fe species in these catalysts as determined by experimental and theoretical approaches, including Fe species transformation during hydrothermal aging; (3) SCR reactions and structure-function correlations; and (4) a few aspects on industrial applications.

APA, Harvard, Vancouver, ISO, and other styles

5

Santamaría-Pérez, David, Tomas Marqueño, Simon MacLeod, Javier Ruiz-Fuertes, Dominik Daisenberger, Raquel Chuliá-Jordan, Daniel Errandonea, et al. "Structural Evolution of CO2-Filled Pure Silica LTA Zeolite under High-Pressure High-Temperature Conditions." Chemistry of Materials 29, no. 10 (May 10, 2017): 4502–10. http://dx.doi.org/10.1021/acs.chemmater.7b01158.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Ryu, Taekyung, Yonjoo Kang, In-Sik Nam, and Suk Bong Hong. "Iron-exchanged high-silica LTA zeolites as hydrothermally stable NH3-SCR catalysts." Reaction Chemistry & Engineering 4, no. 6 (2019): 1050–58. http://dx.doi.org/10.1039/c9re00007k.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Ryzhikov, Andrey, Laura Ronchi, Habiba Nouali, T. Jean Daou, Jean-Louis Paillaud, and Joël Patarin. "High-Pressure Intrusion–Extrusion of Water and Electrolyte Solutions in Pure-Silica LTA Zeolite." Journal of Physical Chemistry C 119, no. 51 (December 15, 2015): 28319–25. http://dx.doi.org/10.1021/acs.jpcc.5b09861.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Oonkhanond, Bovornlak, and Michael E. Mullins. "The effect of composition on the growth and morphology of zeolite A in solution." Journal of Materials Research 19, no. 6 (June 2004): 1613–22. http://dx.doi.org/10.1557/jmr.2004.0238.

Full text

Abstract:

The zeolite LTA (Linde type A) framework is composed of an equal amount of silica and alumina arranged in a three-dimension tetrahedral structure. This high alumina content zeolite possesses a strong negative surface charge in a basic solution due to the substitution of aluminum atoms into a SiO4 tetrahedral structure making it difficult to form a continuous layer in solution. Synthesis parameters such as synthesis duration, chemical composition, and synthesis temperature were varied. The crystallization kinetics was carried out using the particle size measurement, percent crystallinity from x-ray diffraction analysis, infrared absorption of tetrahedra using attenuated total reflectance Fourier transform infrared spectroscopy, and the exponential growth model. The results showed that the zeolite A crystallization in a solution depends on the chemical kinetics of the zeolite formation, surface charge of the substrate, and the mass transfer in the solution.

APA, Harvard, Vancouver, ISO, and other styles

9

Lemishko, Tetiana, Susana Valencia, Fernando Rey, Mónica Jiménez-Ruiz, and German Sastre. "Inelastic Neutron Scattering Study on the Location of Brønsted Acid Sites in High Silica LTA Zeolite." Journal of Physical Chemistry C 120, no. 43 (October 24, 2016): 24904–9. http://dx.doi.org/10.1021/acs.jpcc.6b09012.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Ryu, Taekyung, Nak Ho Ahn, Seungwan Seo, Jung Cho, Hyojun Kim, Donghui Jo, Gi Tae Park, et al. "Fully Copper-Exchanged High-Silica LTA Zeolites as Unrivaled Hydrothermally Stable NH3-SCR Catalysts." Angewandte Chemie International Edition 56, no. 12 (January 18, 2017): 3256–60. http://dx.doi.org/10.1002/anie.201610547.

Full text

APA, Harvard, Vancouver, ISO, and other styles

11

Ryu, Taekyung, Nak Ho Ahn, Seungwan Seo, Jung Cho, Hyojun Kim, Donghui Jo, Gi Tae Park, et al. "Fully Copper-Exchanged High-Silica LTA Zeolites as Unrivaled Hydrothermally Stable NH3-SCR Catalysts." Angewandte Chemie 129, no. 12 (January 18, 2017): 3304–8. http://dx.doi.org/10.1002/ange.201610547.

Full text

APA, Harvard, Vancouver, ISO, and other styles

12

Liu, Yifeng, Dong Yang, Jin Shang, Jenny Zhou, and Victor Chang. "Direct decomposition of NO over 8MR in high silica Cu-LTA zeolite: A DFT study on reaction mechanisms, thermodynamics and kinetics." Molecular Catalysis 530 (September 2022): 112602. http://dx.doi.org/10.1016/j.mcat.2022.112602.

Full text

APA, Harvard, Vancouver, ISO, and other styles

13

Jo, Donghui, Taekyung Ryu, Gi Tae Park, Pyung Soon Kim, Chang Hwan Kim, In-Sik Nam, and Suk Bong Hong. "Synthesis of High-Silica LTA and UFI Zeolites and NH3–SCR Performance of Their Copper-Exchanged Form." ACS Catalysis 6, no. 4 (March 10, 2016): 2443–47. http://dx.doi.org/10.1021/acscatal.6b00489.

Full text

APA, Harvard, Vancouver, ISO, and other styles

14

Jo, Donghui, Gi Tae Park, Taekyung Ryu, and Suk Bong Hong. "Economical synthesis of high-silica LTA zeolites: A step forward in developing a new commercial NH3-SCR catalyst." Applied Catalysis B: Environmental 243 (April 2019): 212–19. http://dx.doi.org/10.1016/j.apcatb.2018.10.042.

Full text

APA, Harvard, Vancouver, ISO, and other styles

15

Conato, Marlon T., Matthew D. Oleksiak, B. Peter McGrail, Radha K. Motkuri, and Jeffrey D. Rimer. "Framework stabilization of Si-rich LTA zeolite prepared in organic-free media." Chemical Communications 51, no. 2 (2015): 269–72. http://dx.doi.org/10.1039/c4cc07396g.

Full text

APA, Harvard, Vancouver, ISO, and other styles

16

Jacas-Rodríguez, A., P. Rodríguez-Pascual, D. Franco-Manzano, L. Contreras, C. Polop, and M. A. Rodriguez. "Mixed Matrix Membranes prepared from polysulfone and Linde Type A zeolite." Science and Engineering of Composite Materials 27, no. 1 (August 21, 2020): 236–44. http://dx.doi.org/10.1515/secm-2020-0022.

Full text

Abstract:

AbstractThis work focuses on dip coating and further phase inversion prepared polysulfone/LTA zeolite mixed matrix membranes (MMMs). The Linde Type A (LTA) zeolite synthesized under hydrothermal conditions by the organic free method was introduced as fillers at 10 and 20 wt.% loadings into the polysulfone polymer matrix to obtain MMMs. The x-ray diffraction (XRD) and scanning electron microscopy (SEM) analysis indicated that the as-synthesized LTA zeolite samples were crystalline and mainly composed of crystal of predominantly cubic shape. Textural characterisation using Ar adsorption/desorption data of LTA zeolite shown the existence of mesoporous. Atomic force microscopy (AFM) in combination with the SEM characterised the membrane morphology and the dispersion of zeolite fillers. The effect of the zeolite loading on the performance of the MMMs was analysed. It points out that N2 permeability was increased with the increment of zeolite filler, also the high membranes permeability and the weak dependence upon transmembrane pressure and therefore its high selectivity. The average membrane thickness was 150 μm.

APA, Harvard, Vancouver, ISO, and other styles

17

Bores, Cecilia, Song Luo, J. David Lonergan, Eden Richardson, Alexander Engstrom, Wei Fan, and Scott M. Auerbach. "Monte carlo simulations and experiments of all-silica zeolite LTA assembly combining structure directing agents that match cage sizes." Physical Chemistry Chemical Physics 24, no. 1 (2022): 142–48. http://dx.doi.org/10.1039/d1cp03913j.

Full text

Abstract:

We investigated the influence of organic structure-directing agents (OSDAs) on the formation rates of all-silica zeolite LTA using both simulations and experiments, to shed light on the crystallization process.

APA, Harvard, Vancouver, ISO, and other styles

18

Confalonieri, Giorgia, Andrey Ryzhikov, Rossella Arletti, Simona Quartieri, Giovanna Vezzalini, Carole Isaac, Jean-Louis Paillaud, Habiba Nouali, and T. Jean Daou. "Structural interpretation of the energetic performances of a pure silica LTA-type zeolite." Physical Chemistry Chemical Physics 22, no. 9 (2020): 5178–87. http://dx.doi.org/10.1039/c9cp06760d.

Full text

Abstract:

The intrusion–extrusion process of various electrolyte aqueous solutions in a hydrophobic pure-silica LTA zeolite was investigated for energetic purposes by means of in situ HP XRPD, porosimeter tests, thermogravimetric analysis and NMR spectroscopy.

APA, Harvard, Vancouver, ISO, and other styles

19

Hu, Sufang, Guoqiang Song, Da Xue, and Fuxiang Li. "Influence of alkalinity on the synthesis of hierarchical LTA zeolite by using bridged polysilsesquioxane." RSC Advances 9, no. 5 (2019): 2551–58. http://dx.doi.org/10.1039/c8ra08952c.

Full text

Abstract:

The mechanism of formation of hierarchical LTA zeolite involved the methoxyl groups of bridged polysilsesquioxane hydrolyzing into hydroxyl groups. The Si–O–Si bond was formed between silicon hydroxyl and silica by dehydration, avoiding phase separation.

APA, Harvard, Vancouver, ISO, and other styles

20

Xu, Kai, Zhenqi Jiang, Bo Feng, and Aisheng Huang. "A graphene oxide layer as an acid-resisting barrier deposited on a zeolite LTA membrane for dehydration of acetic acid." RSC Advances 6, no. 28 (2016): 23354–59. http://dx.doi.org/10.1039/c6ra00802j.

Full text

Abstract:

A graphene oxide layer (GO) was deposited as acid-resisting barrier to avoid the degradation of zeolite LTA membrane by acetic acid, leading to a high selectivity and stability of the zeolite LTA membrane for the dehydration of acetic acid.

APA, Harvard, Vancouver, ISO, and other styles

21

Kocevski, Vancho, Shenyang Y. Hu, and Theodore M. Besmann. "Alkaline earth ion exchange study of pure silica LTA zeolites using periodic first-principles calculations." New Journal of Chemistry 43, no. 43 (2019): 16835–40. http://dx.doi.org/10.1039/c9nj04091a.

Full text

Abstract:

The Linde Type A (LTA) zeolite capability to exchange alkaline earth ions is analyzed using DFT calculations, considering the systems to be in water and vacuum, investigating the LTA's potential as a material for radioactive decontamination processes.

APA, Harvard, Vancouver, ISO, and other styles

22

Belviso, Claudia, and Francesco Cavalcante. "Effect of H2O Activity on Zeolite Formation." Materials 13, no. 21 (October 26, 2020): 4780. http://dx.doi.org/10.3390/ma13214780.

Full text

Abstract:

In an effort to understand the effects of H2O activity on zeolite formation, we have synthesized LTA zeolite using a combination of freezing processes and varying drying temperatures. Sodium aluminate and sodium silicate were used to form LTA zeolite, according to the IZA (International Zeolite Association) protocol. The synthesis steps were modified by adding the precursor frozen process by a rapid liquid nitrogen (−196 °C) treatment or slow conventional freezer treatment (−20 °C). The samples were subsequently sonicated and then dried at 80 °C or 40 °C. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were performed on the samples immediately after the drying process as well as after 2 weeks and 1 month of aging the solid products. The results indicated that LTA zeolite does not form. The silica-alumina precursor after both freezing processes and after being dried at 80 °C showed the presence of sodalite displaying stable behavior over time. Both sets of samples dried at 40 °C and did not show the presence of zeolite immediately after the drying process. However, after 2 weeks, the liquid nitrogen–frozen precursor was characterized by the presence of EMT whereas zeolites never formed in the −20 °C samples. These results suggest that freezing processes differently control the H2O activity during the drying and aging processes in the solid state. Thus, although the precursor chemical composition is the same, the type of zeolite formed is different.

APA, Harvard, Vancouver, ISO, and other styles

23

Radulovic, Aleksandra, Radovan Dimitrijevic, Predrag Vulic, and Vera Dondur. "Influence the of Na-LTA synthesis route on low-carnegieite crystallization and stability." Chemical Industry 61, no. 3 (2007): 117–22. http://dx.doi.org/10.2298/hemind0703117r.

Full text

Abstract:

The thermal transformation of zeolite precursor is a relatively novel route for the synthesis of aluminosilicate-based ceramic materials which had found numerous uses in the production of dielectric ceramics, microelectronic packaging electromagnetic windows, high-temperature electrical insulators, glass ceramic materials, etc. The mechanism of a thermally induced transformation strongly depends on the extra framework cations and the type of used zeolites. The sodium form of LTA zeolite transforms to low-carnegieite (lt-Carn) in the temperature range between 800 and 900?C. The formed low-carnegieite transforms to nepheline at >900?C. However, the mechanisms of the thermal transformation of Na-LTA zeolite into the low-carnegieite (lt-Carn) phase are still not completely understood. Different structure transformation mechanisms of Na-LTA zeolite into lt-Carn heve been reported. The carnegieite can be formed by a direct solid-solid topotactic transformation: Na-LTA -> lt-Carn. A two step mechanism: Na-LTA -> Am -> lt-Carn can also take place. Such behavior is probably the consequence of the applied synthesis route in the precursor preparation. Therefore, it is of interest to consider the influence of the zeolite preparation route on the processes of thermal transformation of Na-LTA zeolite into lt-Carn. The present paper deals with a systematic study on the thermally induced phase transformation of sodium LTA zeolites synthesized by the gel route under different reaction conditionss. Different gel compositions Na2O(2.4-3.9):Al2O3(l):SiO2(1.5-2.0):H2O(90-170) were used and several zeolite samples were prepared. The prepared zeolite samples were thermally treated at different temperatures from 600 to 950?C at an interval of 20 ?C and the products were analyzed by X-ray diffraction. The zeolites and formed products were characterized by various methods including XRPD, IR, DTA, SEM. It was shown that the rate of lt-Carn formation is dependent on the composition and conditions of gel preparation. It was determined by X-ray diffraction analysis that all the synthesized Na-LTA zeolites recrystallised into lt-Carn or a new crystalline intermediate phase. The amorphous phase was not present in the investigated system. The mechanism of the direct solid-solid topotactic transformation: Na-LTA -> lt-Carn was confirmed.

APA, Harvard, Vancouver, ISO, and other styles

24

Rozhkovskaya, Alexandra, Jay Rajapakse, and Graeme J. Millar. "Synthesis of LTA zeolite beads using alum sludge and silica rich wastes." Advanced Powder Technology 32, no. 9 (September 2021): 3248–58. http://dx.doi.org/10.1016/j.apt.2021.07.009.

Full text

APA, Harvard, Vancouver, ISO, and other styles

25

Elabed, Alae, Redouan El khalfaouy, Saad Ibnsouda, Régine Basseguy, Soumya Elabed, and Benjamin Erable. "Low-Cost Electrode Modification to Upgrade the Bioelectrocatalytic Oxidation of Tannery Wastewater Using Acclimated Activated Sludge." Applied Sciences 9, no. 11 (May 31, 2019): 2259. http://dx.doi.org/10.3390/app9112259.

Full text

Abstract:

Effective and eco-friendly technologies are required for the treatment of tannery wastewater as its biological toxicity and large volume leads toground water pollution. Hydrophobic (unmodified carbon felt) and hydrophilic modified carbon felt with Linde Type A zeolite (LTA zeolite) and bentonite were examined for their effects on bacterial attachment, current generation, and tannery wastewater treatment efficiency. Chronoamperometry and cyclic voltammetry confirmed the higher electron transfer obtained with modified anodes. Maximum current densities of 24.5 and 27.9 A/m² were provided with LTA zeolite and bentonite-modified anodes, respectively, while the unmodified carbon felt gave a maximum current density of 16.9 A/m². Compared with hydrophobic unmodified carbon felt, hydrophilic modified electrodes increased the exploitation of the internal surface area of the 3D structure of the carbon felt by the electroactive biofilm. The study revealed 93.8 ± 1.7% and 96.3 ± 2.1% of chemical oxygen demand (COD) reduction for LTA zeolite and bentonite, respectively. Simultaneous chromium removal was achieved with values of 94.6 ± 3.6 and 97.5 ± 2.2 for LTA zeolite and bentonite, respectively. This study shows the potential approach of carbon felt clay modification for the efficient tannery wastewater treatment using bioelectrochemicals systems (BESs) accompanied with high current recovery.

APA, Harvard, Vancouver, ISO, and other styles

26

Omerasevic, Mia, Zvezdana Bascarevic, Radojka Vujasin, Aleksandar Devecerski, and Dusan Bucevac. "Effect of milling time on mechanical properties of anorthite obtained by thermal transformation of Ca-LTA zeolite." Science of Sintering 54, no. 3 (2022): 349–58. http://dx.doi.org/10.2298/sos2203349o.

Full text

Abstract:

Anorthite ceramics was fabricated from calcium exchanged Na-LTA zeolite. The powder compacts of Ca-LTA zeolite were sintered at different temperatures ranging between 1100 and 1400?C. It was found that the temperature of 1100?C was sufficiently high to trigger formation of anorthite which stayed stable even at temperature as high as 1400?C. The highest relative density and the lowest open porosity were measured in samples sintered at 1200?C for 3 h. The effect of milling time of Ca-LTA zeolite precursor on density, microstructure and mechanical properties of samples sintered at 1200?C for 3 h was investigated. The particle size refinement appeared to be beneficial in accelerating densification process and improving mechanical properties. The density, compressive strength and hardness of anorthite ceramics obtained from non-milled precursor were measured to be 70.5 %TD, 64 MPa and 1.45 GPa, respectively. On the other side the anorthite ceramics obtained from 24-hour-long milled zeolite precursor had density of 83.9 %TD, compressive strength of 101 MPa and hardness of 3.44 GPa.

APA, Harvard, Vancouver, ISO, and other styles

27

Friberg, Ida, Aiyong Wang, and Louise Olsson. "Hydrothermal Aging of Pd/LTA Monolithic Catalyst for Complete CH4 Oxidation." Catalysts 10, no. 5 (May 7, 2020): 517. http://dx.doi.org/10.3390/catal10050517.

Full text

Abstract:

Palladium-based catalysts are known to provide high CH4 oxidation activity. One drawback for these materials is that they often lose activity in the presence of water vapor due to the formation of surface hydroxyls. It is however possible to improve the water vapor tolerance by using zeolites as support material. In this study, we have investigated Pd supported on thermally stable LTA zeolite with high framework Si/Al ratio (Si/Al = ~44) for CH4 oxidation and the effect of hydrothermal aging at temperatures up to 900 °C. High and stable CH4 oxidation activity in the presence of water vapor was observed for Pd/LTA after hydrothermal aging at temperatures ≤ 700 °C. However, aging at temperatures of 800–900 °C resulted in catalyst deactivation. This deactivation was not a result of structural collapse of the LTA zeolite as the LTA zeolite only showed minor changes in surface area, pore volume, and X-ray diffraction pattern after 900 °C aging. We suggest that the deactivation was caused by extensive formation of ion-exchanged Pd2+ together with Pd sintering. These two types of Pd species appear to have lower CH4 oxidation activity and to be more sensitive to water deactivation compared to the well dispersed Pd particles observed on the LTA support prior to the hydrothermal aging. By contrast, Pd/Al2O3 was generally sensitive to water vapor no matter of the aging temperature. Although the aging caused extensive Pd sintering in Pd/Al2O3, only minor deterioration of the CH4 oxidation activity was seen. The results herein presented show that Pd/LTA is a promising CH4 oxidation catalyst, however Pd rearrangement at high temperatures (≥800 °C) is one remaining challenge.

APA, Harvard, Vancouver, ISO, and other styles

28

Boulfelfel, Salah Eddine, Peter I. Ravikovitch, and David S. Sholl. "Modeling Diffusion of Linear Hydrocarbons in Silica Zeolite LTA Using Transition Path Sampling." Journal of Physical Chemistry C 119, no. 27 (June 23, 2015): 15643–53. http://dx.doi.org/10.1021/acs.jpcc.5b01633.

Full text

APA, Harvard, Vancouver, ISO, and other styles

29

Huang, Zhen, Wei Juan Jiang, Xiao Han Shi, and Li Jun Teng. "High Performance Poly (Vinyl Alcohol)-Zeolite LTA Composite Membranes for Ethanol Dehydration Pervaporation." Advanced Materials Research 287-290 (July 2011): 2053–56. http://dx.doi.org/10.4028/www.scientific.net/amr.287-290.2053.

Full text

Abstract:

Three-layered zeolite LTA-filled poly (vinyl alcohol) (PVA) composite membranes have been fabricated for water removal from highly concentrated ethanol solution by means of pervaporation. Higher separation factor and higher fluxes are both achieved after adding zeolite 3A, 4A and 5A. Through evaluating separation factor and permeation flux, separation performances of the composite membranes are elucidated in terms of the zeolite pore size and processing temperature.

APA, Harvard, Vancouver, ISO, and other styles

30

Kumakiri, Izumi, Yusuke Maruo, Ryotaro Kishibe, Masayuki Murata, Tomoyuki Kosaka, and Mamoru Yamada. "Application of Zeolite Membranes to Dehydrate a Bio-Ethanol Solution Produced by High-Temperature Fermentation." Fuels 2, no. 4 (December 3, 2021): 533–45. http://dx.doi.org/10.3390/fuels2040031.

Full text

Abstract:

The combination of high-temperature fermentation and membrane separation has the potential to realize a simple on-site process to produce concentrated bioethanol. The performance of dehydration membranes in separating bioethanol was investigated in this study. Three types of zeolite membranes, LTA, MFI, and MOR, were synthesized. Their dehydration ability was compared using a bioethanol solution produced by high-temperature fermentation followed by vacuum distillation. The LTA zeolite membranes deformed and became amorphous while treating the distillate. On the contrary, no significant changes were observed in the MFI and MOR zeolite membranes analyzed by X-ray diffraction after treating the distillate. However, the flux declined when the membranes were in contact with the distillate (pH = 3.8). Neutralizing the distillate to pH 6.6 with sodium hydroxide did not prevent the flux decline. Even though flux decreased by about 20–30%, the MOR membrane showed quite high water-selectivity, with a water concentration of over 99.9% in the permeate, suggesting the feasibility of its application to concentrate bioethanol.

APA, Harvard, Vancouver, ISO, and other styles

31

SUN, Minwei, Heather K. HUNT, Christopher M. LEW, Rui CAI, Yan LIU, and Yushan YAN. "A Dynamic Organic Structuring-Directing Agent for Pure-Silica-Zeolite AST and LTA Syntheses." Chinese Journal of Catalysis 33, no. 1 (January 2012): 85–91. http://dx.doi.org/10.1016/s1872-2067(10)60291-4.

Full text

APA, Harvard, Vancouver, ISO, and other styles

32

Inami, Hisao, Chie Abe, and Yasuhisa Hasegawa. "Development of Ammonia Selectively Permeable Zeolite Membrane for Sensor in Sewer System." Membranes 11, no. 5 (May 10, 2021): 348. http://dx.doi.org/10.3390/membranes11050348.

Full text

Abstract:

Ammonia (NH3) and hydrogen sulfide (H2S) are hazardous and odorous gases. A special device that is not affected by other gases is necessary so that it can detect such gases. Zeolite membranes can separate the desired component selectively by molecular sieving and selective adsorption. LTA-, MFI-, and FAU-type zeolite membranes were prepared in this study, and the permeation and separation performances were determined for the ternary mixture of NH3, H2S, and N2 to develop an NH3 selectively permeable membrane. Although the separation factors of NH3 were high enough for the LTA-type zeolite membrane, the NH3 permeance was the lowest among the three membranes. In contrast, the FAU-type zeolite membrane with Si/Al = 1.35 showed a high enough NH3 permeance and a NH3/N2 separation factor. The membrane modification and varying the membrane composition were carried out to reduce the H2S permeance. As a result, the H2S permeance could be decreased by modification with silane coupling agents, and a separation factor of NH3 toward H2S of over 3000 was achieved.

APA, Harvard, Vancouver, ISO, and other styles

33

Asefa, Misikir Tamiru, and Gebisa Bekele Feyisa. "Comparative Investigation on Two Synthesizing Methods of Zeolites for Removal of Methylene Blue from Aqueous Solution." International Journal of Chemical Engineering 2022 (February 12, 2022): 1–12. http://dx.doi.org/10.1155/2022/9378712.

Full text

Abstract:

Organic dyes discharged from industries have significant effect on ecosystem and health of human being because of their toxicity and appearing colour in the wastewater. Absorption method is a more preferable method than other wastewater treatment methods due to its characteristics of being eco-friendly, simple, and efficient. Zeolites are among the porous materials often used as absorbent of organic dye from wastewater. However, wide use of zeolite has been limited due to its expensive precursors and synthesized methods (i.e., hydrothermal method which needs expensive autoclave). In this work, cheap and widely available precursors aluminum from waste food packaging aluminum foil and low cost silica from sugar cane bagasse ash were used to synthesized zeolite without hydrothermal method (Z-B), where hydrothermally synthesized zeolite (Z-A) was used as a reference. The XRD patterns revealed that Z-B was sodalite octahydrate zeolite and Z-A was zeolite Linde Type A (LTA). The morphology and type of bond in both zeolites were investigated by SEM and FTIR. The synthesized zeolites were used as absorbents for absorbing methylene blue (MB) from aqueous solutions. The MB removal efficiency of the synthesized zeolites was evaluated by using UV-Visible spectroscopy. The results indicate that the absorption capacities of Z-B and Z-A were 3.5 mg/g and 3.9 mg/g at 40 mg/L, respectively. Optimum removal efficiencies of both zeolites were observed at PH of 7 and adsorbent dosage of 0.005 mg/L. The stabilities of both zeolites were tested three times. The absorption isotherms of sodalite octahydrate zeolite and zeolite LTA were effectively fitted with the Freundlich and Langmuir modes. Moreover, the absorption kinetics of both zeolites follow pseudo-second-order kinetics. Therefore, nonhydrothermally synthesized zeolite is alternative absorbent for dye removal due to its safety, cheap cost, using low cost and widely available precursors, and using easy and safe synthesizing method.

APA, Harvard, Vancouver, ISO, and other styles

34

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

35

Zhu, Guangshan, Shilun Qiu, Jihong Yu, Yasuhiro Sakamoto, Fengshou Xiao, Ruren Xu, and Osamu Terasaki. "Synthesis and Characterization of High-Quality Zeolite LTA and FAU Single Nanocrystals." Chemistry of Materials 10, no. 6 (June 1998): 1483–86. http://dx.doi.org/10.1021/cm980061k.

Full text

APA, Harvard, Vancouver, ISO, and other styles

36

Ji, Yanyan, Bing Zhang, Wu Zhang, Bo Zhao, Hongbo Li, Dongmei Wang, and Ying Li. "High-efficient synthesis of zeolite LTA via a wet-gel crystallization route." Chemical Research in Chinese Universities 33, no. 4 (July 8, 2017): 520–24. http://dx.doi.org/10.1007/s40242-017-7008-y.

Full text

APA, Harvard, Vancouver, ISO, and other styles

37

Cheung, Ocean, Dariusz Wardecki, Zoltán Bacsik, Petr Vasiliev, Lynne B. McCusker, and Niklas Hedin. "Highly selective uptake of carbon dioxide on the zeolite |Na10.2KCs0.8|-LTA – a possible sorbent for biogas upgrading." Physical Chemistry Chemical Physics 18, no. 24 (2016): 16080–83. http://dx.doi.org/10.1039/c6cp02443b.

Full text

Abstract:

Zeolite |Na_10.2KCs_0.8|-LTA was found to be a promising adsorbent for applications such as biogas upgrading. The CO₂-over-CH₄ selectivity was very high (over 1500).

APA, Harvard, Vancouver, ISO, and other styles

38

Kocevski, Vancho, Benjamin D. Zeidman, Charles H. Henager, and Theodore M. Besmann. "Communication: First-principles evaluation of alkali ion adsorption and ion exchange in pure silica LTA zeolite." Journal of Chemical Physics 149, no. 13 (October 7, 2018): 131102. http://dx.doi.org/10.1063/1.5051347.

Full text

APA, Harvard, Vancouver, ISO, and other styles

39

Shirakura, Shigeo, Shukuhei Kojima, Kazuhiro Tanaka, and Hidetoshi Kita. "Synthesis of Zeolite Membranes from Coal Fly Ash." Advanced Materials Research 383-390 (November 2011): 1749–52. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.1749.

Full text

Abstract:

Zeolite membranes were successfully synthesized from coal fly ash by hydrothermal treatment onto 10-cm-long tubular porous supports. The membranes were characterized from XRD analysis, SEM observation and the pervaporation performance. Under the optimized conditions, LTA-type membrane from coal fly ash showed fairly efficient for the dehydration of organic liquids. The maximum selectivity reached more than 3000 with accompanying flux as high as 3.0 kg/(m2•h) for separation of 90 wt% EtOH aqueous solution at 75 °C.

APA, Harvard, Vancouver, ISO, and other styles

40

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

41

Khramtsova, Aleksandra P., Valery Yu Prokof’ev, Natalya E. Gordina, Darya S. Cherednikova, and Ekaterina M. Konstantinova. "THERMAL BEHAVIOR OF MIXTURE BASED ON METAKAOLIN FOR LTA ZEOLITE SYNTHE-SIS: EFFECT OF ULTRASONIC TREATMENT." IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 62, no. 2 (February 7, 2019): 65–71. http://dx.doi.org/10.6060/ivkkt.20196202.5702.

Full text

Abstract:

A study of the influence of ultrasonic treatment on the kinetics of solid-phase interaction of metakaolin with the sodium hydroxide was performed. Reflections corresponding to the zeolite LTA were observed on X-ray patterns according to phase analysis before calcination at 500 °C for the sample without pre-treatment. The appearance of a new phase of sodium alumosilicate (Na6Al4Si4O17) was observed with increasing temperature to 700 °C. The reflections of sodium aluminosilicate (Na8Al4Si4O18) and nepheline were detected on the X-ray pattern when the temperature calcination 800 °C besides to the characteristic reflections of the zeolite. Aluminosilicates were obtained by recrystallization of the zeolite partisles. Also the process was accompanied by metakaolin decomposition in silica and mullite. Reflections corresponding to the zeolite was not discovered at 900 °C. According to the X-ray analysis, it was found that ultrasonic treatment has no effect on the phase composition of the samples. Based on these data, it was determined the temperature range (500-800 °C). There was recrystallization of zeolite in aluminosilicates for this temperature range. According to the thermal analysis, especially the data of mass loss in a given temperature interval, the exact temperature ranges were established for each heating rate of the samples without pre-treatment and the samples after ultrasonic treatment. The Ozawa-Flynn-Wall method was selected as an isoconversional analysis. The monotonous growth of apparent activation energy was found in all range of conversion degrees after ultrasonic treatment. This allows smoothing the change in the transitional regime (up to 200 kJ / mol) to kinetic one. The apparent activation energy for the sample without ultrasonic treatment gone approximately at one level (350 kJ/mol) upon reaching the conversion degree of 0.5-0.6. The apparent activation energy increases after ultrasonic treatment from 350 to 450 kJ/mol upon reaching the conversion degree above 0.9.

APA, Harvard, Vancouver, ISO, and other styles

42

Xue, Zhaoteng, Jinghong Ma, Wenming Hao, Xiang Bai, Yuhong Kang, Jianhong Liu, and Ruifeng Li. "Synthesis and characterization of ordered mesoporous zeolite LTA with high ion exchange ability." J. Mater. Chem. 22, no. 6 (2012): 2532–38. http://dx.doi.org/10.1039/c1jm14740d.

Full text

APA, Harvard, Vancouver, ISO, and other styles

43

Belviso, Claudia, Giulia Guerra, Maryam Abdolrahimi, Davide Peddis, Federica Maraschi, Francesco Cavalcante, Maurizio Ferretti, Annalisa Martucci, and Michela Sturini. "Efficiency in Ofloxacin Antibiotic Water Remediation by Magnetic Zeolites Formed Combining Pure Sources and Wastes." Processes 9, no. 12 (November 26, 2021): 2137. http://dx.doi.org/10.3390/pr9122137.

Full text

Abstract:

In this work, red mud (RM) and spinel iron oxide nanoparticles (SPIONs) were added to pure silica/alumina sources (SAs) and fly ash (FA) with the aim of synthesizing and investigating the magnetic behavior of different zeolites. SAs were used to synthesize zeolite with LTA topology (zeolite A) with the addition of both red mud and spinel iron oxide nanoparticles. FA and RM were mixed to synthesize sodalite whereas only FA with the addition of SPIONs was used to form zeolite with FAU-topology (zeolite X). All the synthetic products showed magnetic properties. However, zeolites with spinel iron oxide nanoparticles (zeolites A and X) showed ferromagnetic-like behavior. Sodalite was characterized by a reduction in saturation magnetization, whereas zeolite A with red mud displayed antiferromagnetic behavior. For the first time, all the synthetic products were tested for polluted water remediation by a persistent emerging contaminant, ofloxacin (OFL) antibiotic. The four zeolite types showed good adsorption affinity towards OFL under actual conditions (tap water, natural pH). All materials were also tested for OFL removal in real waters spiked with OFL 10 µg L−1. Satisfactory recoveries (90–92% in tap water, 83–87% in river water) were obtained for the two zeolites synthesized from industrial waste materials.

APA, Harvard, Vancouver, ISO, and other styles

44

Bouizi, Younès, Jean-Louis Paillaud, Laurent Simon, and Valentin Valtchev. "Seeded Synthesis of Very High Silica Zeolite A." Chemistry of Materials 19, no. 4 (February 2007): 652–54. http://dx.doi.org/10.1021/cm063019v.

Full text

APA, Harvard, Vancouver, ISO, and other styles

45

Maghsoudi, Hafez, Vahid Nozari, and S. Reza Zamzami. "Diffusion of methane in high-silica CHA zeolite." Heat and Mass Transfer 55, no. 6 (December 17, 2018): 1619–25. http://dx.doi.org/10.1007/s00231-018-02547-0.

Full text

APA, Harvard, Vancouver, ISO, and other styles

46

Kuechl, Dorothy E., Annabelle I. Benin, Lisa M. Knight, Hayim Abrevaya, Stephen T. Wilson, Wharton Sinkler, Thomas M. Mezza, and Richard R. Willis. "Multiple paths to nanocrystalline high silica beta zeolite." Microporous and Mesoporous Materials 127, no. 1-2 (January 2010): 104–18. http://dx.doi.org/10.1016/j.micromeso.2009.06.035.

Full text

APA, Harvard, Vancouver, ISO, and other styles

47

YOSHIDA, A. "ChemInform Abstract: Synthesis of High-Silica Zeolite Y." ChemInform 22, no. 48 (August 22, 2010): no. http://dx.doi.org/10.1002/chin.199148027.

Full text

APA, Harvard, Vancouver, ISO, and other styles

48

ZHU, G., S. QUI, J. YU, Y. SAKAMOTO, F. XIAO, R. XU, and O. TERASAKI. "ChemInform Abstract: Synthesis and Characterization of High-Quality Zeolite LTA and FAU Single Nanocrystals." ChemInform 29, no. 34 (June 20, 2010): no. http://dx.doi.org/10.1002/chin.199834017.

Full text

APA, Harvard, Vancouver, ISO, and other styles

49

García, Adriana Lucía, Carmen Milena López, Luis Vicente García, Mireya Rincon de Goldwasser, and Johliny Del Carmen Casanova. "Improvements in the synthesis of zeolites with low Si/Al ratio from Venezuelan sodium silicate for an environmentally friendly process." Ingeniería e Investigación 36, no. 1 (April 18, 2016): 62–69. http://dx.doi.org/10.15446/ing.investig.v36n1.52855.

Full text

Abstract:

<p>LTA and FAU zeolites were successfully synthesized from a Venezuelan sodium silicate solution, by hydrothermal crystallization under autogenous pressure at 100°C, with 2–24h crystallization times. The synthesized materials were characterized by XRD, BET specific surface area and SEM. A series of synthesis tests were performed to study the influence of the molar composition of the starting mixture over zeolites crystallization. The effect of crystallization time for a particular synthesis mixture composition was studied for both zeolites types. The reuse as alkaline medium of the mother liquor separated during filtration, and the effect of the aging before crystallization were additionally studied. The experimental result are in agreement with the crystallization mechanism proposed for zeolites synthesis in liquid phase. The use of a 2SiO2:Al2O3:6.Na2O:240H2O synthesis mixture composition allows obtaining LTA zeolite within 2h of crystallization. For FAU zeolite, no aging period was needed when starting with a 4SiO2:Al2O3:6.6Na2O:264H2O composition. It was possible to synthesize both zeolites with high purity and crystallinity and with adequate water adsorption properties.</p>

APA, Harvard, Vancouver, ISO, and other styles

50

Tokudome, Yasuaki, Kazuki Nakanishi, Sho Kosaka, Ayuta Kariya, Hironori Kaji, and Teiichi Hanada. "Synthesis of high-silica and low-silica zeolite monoliths with trimodal pores." Microporous and Mesoporous Materials 132, no. 3 (August 2010): 538–42. http://dx.doi.org/10.1016/j.micromeso.2010.04.005.

Full text

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!