آخرین محصولات
Synthetic zeolites and other microporous oxide molecular sieves
A UOP team developed the new XH7 zeolite desiccant, which is compatible with the new R134a lubricant systems, to meet the critical legislated deadlines. The deadlines for original automotive equipment manufacture and fleet testing were set at 3 years before system production, an extremely short development time for such a …
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Molecular sieve ceramic pervaporation membranes in
Based on our findings, to enhance the membrane separation performance, high selectivity of molecular sieve membrane toward specific solvent molecules is the key determining factor. In addition, zeolite and composite membrane are found to be the potential ceramic pervaporation membranes used in carbon footprint reduction in solvent …
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A zeolite-like aluminophosphate membrane with …
A zeolite-like aluminophosphate membrane with molecular-sieving property for water desalination Y. Wang, X. Zou, L. Sun, H. Rong and G. Zhu, Chem. Sci., 2018, 9, 2533 DOI: …
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Industrial Zeolite Applications for Gas Adsorption and Separation
The zeolite choice is evidently related to the nature of the industrial application. The use of the different forms of LTA zeolite is widespread in the domain of the separation of small molecules (Fig. 2) where very often a molecular sieving separation mechanism is contemplated. Besides, the different and diverse forms of the FAU …
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Metal-organic framework nanosheets as building blocks for
2 (0.33 nm) through molecular sieving. More-over, unlike zeolite nanosheets, which consist of cages (or half cages) or zigzag channels ( 10), the pores of Zn 2(bim) 4 MSNs are constructed with four flat bim molecules, ensuring the rapid tran-sport of H 2 molecules. A colloidal dispersion containing ~15 mg/liter Zn 2(bim) 4 ...
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Zeolites in Adsorption Processes: State of the Art and …
Zeolites are microporous crystalline materials widely used as catalysts, adsorbents, and ion exchangers. The main characteristics, preparation methods, and applications have been presented. The basic concepts …
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Chapter 2 Zeolites and molecular sieves: An historical perspective
The history of zeolites and molecular sieves is reviewed from the discovery of the first zeolite mineral in 1756 through the explosion in new molecular sieve structures and compositions in the 1980's and 1990's. R. M. Barrer's early pioneering work in adsorption and synthesis began the era of synthetic zeolites.
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Polycrystalline zeolite and metal-organic framework membranes …
Controlling the Si/Al ratio introduces an extra surface selectivity to zeolite membranes, favoring water treatment applications because of the high water affinity, ion exchange property and molecular sieving capacity [51], [146], [152]. For example, MFI zeolite membranes exhibit high water/alcohol selectivity up to 6300 when the Si/Al ratios ...
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Separation of Hexane Isomers in a Metal-Organic Framework …
The individual RON of each isomer and the average RON of the final product are included. Current technology uses the small cross-sectional area of n-hexane and a zeolite-sieving process to remove this low-RON isomer from the mixture and return it to the isomerization reactor.In some cases, distillation is then used to further augment the RON …
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Hydrogen-sieving zeolitic films by coating zeolite nanosheets on …
Additionally, expensive asymmetric inorganic porous supports are often needed for calcination of the zeolite films. Herein, scalable preparation of H 2-sieving RUB-15 nanosheet films is reported bypassing the need for secondary growth and expensive supports. A novel, low-cost, thermally-robust, porous polybenzimidazole copolymer (PBI- …
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High–aspect ratio zeolitic imidazolate framework (ZIF
Realizing high–aspect ratio morphologies in selective materials for gas separation has well-known benefits. Their planar structure allows for the deposition of ultrathin selective layers on permeable substrates, where molecular sieving is achieved either by the atomic pores in the sheet basal planes or by the interlayer spacing between …
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Hydrogen-sieving zeolitic films by coating zeolite
Zeolite membranes with high performance (flux = 8.0-9.0 kg m(-2) h(-1), alpha >10 000) can be synthesized directly on polymer-zeolite composite hollow fiber supports by a single in situ ...
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Molecular Sieves | Molecular Sieve Adsorbents | Zeochem
Molecular sieve adsorbents are crystalline aluminosilicates, known as zeolites. Their unique structure allows the water of crystallization to be removed, leaving a porous crystalline structure. These pores, or cages, have a high affinity to re-adsorb water or other polar molecules. Aided by strong ionic forces (electrostatic fields) due to the ...
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MOF-in-COF molecular sieving membrane for selective hydrogen …
Covalent organic frameworks (COFs) are promising materials for separation membranes, but their wide pores prevent selective gas separation through molecular sieving. Here, the authors demonstrate ...
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Zeolites for separation: Fundamental and application
For membrane separation with zeolites, the key issue is how to construct good zeolite membranes. Zeolite membrane should be ideally defect-free to exhibit the …
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1 Introduction
Linde zeolite A, FAU for molecular sieves with a faujasite topology (e.g., zeolites X, Y), MOR for the mordenite topology, MFI for the ZSM - 5 and silicalite topolo-gies and AFI …
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Post‐Synthesis Functionalization Enables Fine‐Tuning the …
zeolite bond in a reaction with a bridging oxygen as proved by multiple analysis data. It is demonstrated that the post-functionalization can be used to tailor the molecular sieving action of a parent zeolite to give size-selective adsorbents for light olefin/paraffin separations. 4-Methoxybenzene-functionalized MOR separates ethylene …
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Continuously Adjustable, Molecular-Sieving "Gate" on 5A Zeolite …
Zeolites/molecular sieves are one of the most promising adsorbents that may help realize true molecular-sieving separation, because of their uniform, molecular-sized pores (0.3~1.3 nm) and high ...
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Continuously Adjustable, Molecular-Sieving "Gate" on …
Zeolites/molecular sieves are one of the most promising adsorbents that may help realize true molecular-sieving separation, …
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Advanced scalable zeolite "ions-sieving" composite membranes …
In this paper, a simple, scalable and versatile method was presented to fabricate zeolite composite membranes with high stability. Interfacial polymerization, an industrialized fabrication technique for composite membranes, was utilized to in-situ produce binder to fix zeolites onto the porous membrane surface. Interfacial polymerization was …
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Nanostructured zeolite 4A molecular sieving air separation membranes
A novel membrane forming strategy is reported to probe the intrinsic O2/N2 selectivity of zeolite 4A membrane and to fabricate highly selective nanocomposite membranes by using a nanocrystal-derived hierarchical porous zeolite 4A membrane whose non-zeolitic mesoporsity is filled with a nonpermeable polymer m
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Self-assembled iron-containing mordenite monolith for carbon
Iron atoms bound in tetrahedral zeolite sites narrowed the channels and enabled the size-exclusion separation of carbon dioxide (CO 2) over nitrogen (N 2) and methane. High CO 2 uptake and highly efficient CO 2 –N 2 separation was demonstrated for both dry and humid conditions. Science, aax5776, this issue p. 315.
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Ultrapermeable 2D-channeled graphene-wrapped zeolite …
zeolite-based membrane that enables the rapid and selective separa-tion of H 2 from CH 4 or other gases. Therefore, the development of outstanding zeolite-based mem-branes for the construction of H 2-assisted green technology is an active challenge (11). Internal surface modification of MFI zeolite
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Low-energy adsorptive separation by zeolites
Steric effect/size exclusion/sieving effect. The steric effect is also referred to as the size-exclusion effect or sieving effect in which only small and properly shaped molecules can be diffused into the zeolite adsorbents, whereas all other molecules and components that are too large are excluded, which can lead to an unlimited high selectivity.
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New force field for GCMC simulations of D2/H2 quantum sieving …
New force field for GCMC simulations of D 2 /H 2 quantum sieving in pure silica zeolites ... Here we propose a new force field adjusted by using our experimental data obtained for the pure silica MFI zeolite at 65 K and 77 K. With this new force field, it is possible to predict the adsorption and coadsorption equilibria on the three zeolite ...
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Zeolite molecular sieves: preparation and scale-up
Zeolite molecular sieves find extensive use in catalytic and sorption–separation processes and ion-exchange applications––see the other papers in this series and Proceedings from the 14th International …
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Application of Zeolite Molecular Sieve
This zeolite molecular sieve dehydration process is the preferred process for industrial production of fuel ethanol. (2) Purify pollutants in the air. With the rapid development of industry, the emissions of H2S, SO2, NOX and formaldehyde are increasing, and the pollution caused has brought serious harm to people's lives and the environment.
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Molecular Sieves-Desiccant Expert -JALON
Molecular sieve is a kind of adsorbent or membrane material with uniform micropores, mainly composed of silicon, aluminum, oxygen and other metal cations. Its pore size is equivalent to the general molecular size, and various fluid molecules are screened according to its effective pore size. Zeolite molecular sieves refer to those natural and ...
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Chapter 2 Zeolites and molecular sieves: An historical perspective
The history of zeolites and molecular sieves is reviewed from the discovery of the first zeolite mineral in 1756 through the explosion in new molecular sieve structures …
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Zeolite
Table of Contents Zeolites are crystalline aluminosilicates of the alkaline and alkaline-earth metals. They possess many desirable ion- exchange, molecular sieving, and catalytic properties, which make them valuable mineral commodities. Synthetic zeolites have been used for over 25 yr in commercial processes, but only recently have natural zeolites …
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