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Mesoporous zeolites
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An overview is presented on the central role that zeolites and other nanoporous materials currently play in the Fluid Catalytic Cracking (FCC) process as well as how this role evolved over the course of the years since its inception.
14p
vironald
15-12-2022
9
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The 31P MAS NMR spectra of phosphorus-modified chabazite (P-CHA) zeolites have been observed during the hydrothermal treatment to probe the structural changes of phosphorus species in zeolites. Characteristic changes of the spectra were observed in the range of 27 ~ 42 ppm, which correlates to the hydrothermal structure changes in P-CHA zeolite
12p
vironald
15-12-2022
6
2
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Alumosilicate materials zeolites are widely exploited due to porous structure and ion-exchange properties in several industrial, agriculture and veterinary applications. The mainly used zeolite for medical purposes in animals and humans is the natural zeolite clinoptilolite.
11p
vironald
15-12-2022
7
3
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Tubular zeolite BEA membrane was prepared by a hydrothermal secondary growth method in the absence of an organic structure directing agent (OSDA). Membrane formation process was carefully observed by using FE-SEM, XRD, and N2 adsorption, and the role of seed crystals on the support surface was discussed.
6p
vironald
15-12-2022
9
3
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The formation process of zeolite A (Linde Type A) was monitored inline at 1.5 L scale by Photon Density Wave (PDW) spectroscopy as novel process analytical technology for highly turbid liquid suspensions.
6p
vironald
15-12-2022
8
3
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Three kinds of hierarchical Mordenite Framework Inverted (MFI)-type nanozeolites including Si-MFI, Al-MFI and Ti-MFI were successfully synthesized by two-stage varying temperature hydrothermal treatment. Taking toluene as the probe molecule, a series of methods were used to evaluate the adsorption properties of as-synthesized hierarchical zeolites samples including the adsorption breakthrough curves, simulation of adsorption isotherms as well as kinetics models and toluene-TPD (the temperature programmed desorption of toluene).
10p
vironald
15-12-2022
3
3
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Ultra-thin MFI zeolite membranes with different Si/Al ratios (152, 47 and 26) were prepared on graded αalumina supports in the presence of organic template molecules and evaluated for separation of equimolar CO2/ CH4 mixtures at temperatures from 315 to 249 K.
7p
vironald
15-12-2022
4
2
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Hierarchical zeolites containing ruthenium oxide nanoparticles were applied in the reaction of dihydroxyacetone isomerization to alkyl lactates and lactic acid. The synthesis of these materials was performed by dispersing the specified amount of two microporous zeolites (HFAU and NaBEA) withan ultrasound bath for 30 min, in a mixture containing cetyltrimethylammonium bromide, water, ethanol and ammonia.
5p
vironald
15-12-2022
2
2
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Analytical characterization and evaluation of performance of zeolite catalysts are normally done under the assumption of a homogeneous batch. However, it is known that in the same batch particles of the zeolite ZSM-5 can be very different one from another, regarding their aluminum content and catalytic performance.
5p
vironald
15-12-2022
4
2
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Cell-penetrating peptides (CPPs), and metal-organic frameworks (MOFs) are promising as next-generation for the delivery of gene-based therapeutic agents. Oligonucleotide (ON)-mediated assembly of nanostructures composed of hierarchical porous zeolitic imidazolate framework (ZIF-8), and nanoparticles such as graphene oxide (GO), and magnetic nanoparticles (MNPs) for gene therapy are reported.
10p
vironald
15-12-2022
4
2
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Titanosilicate ferrierite zeolite (FER) and its delaminated form (ITQ-6), with various Si/Ti molar ratios, were synthetized and tested as catalysts for diphenyl sulfide (Ph2S) and dimethyl sulfide (DMS) oxidation with H2O2. The zeolites were characterized with respect to their chemical composition (ICP-OES), structure (XRD, UV–vis DRS) and texture (low-temperature N2 adsorption-desorption).
9p
vironald
15-12-2022
7
2
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The obtained catalysts were characterized by means of N2 sorption, XRD, Py–FTIR, FTIR, H2 chemisorption and TEM to determine the effect of the Pt precursor on their physicochemical properties. Catalytic performance of obtained catalysts was investigated in hydroisomerization of n-hexadecane.
12p
vironald
15-12-2022
3
2
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We investigated the influences of the changes in the electronic structure and size of the anion of an imidazolium ionic liquid (IL) on gas adsorption and separation performance of the IL/ZIF-8 (zeolitic imidazolate framework) composites
11p
vironald
15-12-2022
7
2
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The fluorination reaction is strongly influenced by the nature of the intrapore cation. Intrapore Brønsted acids facilitate fluorination of the framework by in situ ion-exchange, releasing the acidic ions to the zeolite surface.
11p
vironald
15-12-2022
4
2
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Two main types of morphological features resulting in surface roughness were observed on alumina discs used as supports for zeolite membranes. These features can be described as hills and pits and it was shown that defects as cracks formed in the zeolite film at these locations of the support.
5p
vironald
15-12-2022
7
2
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Classical molecular dynamics simulations have been employed to study the exchange of Na+ for Hg2+ in zeolite Na-A, with a Si/Al ratio of 1, and zeolite Na-Y, with Si/Al ratios of 2 and 5, in dry and hydrated conditions within the temperature range 330 – 360 K, to understand factors underpinning the performance of zeolites for water decontamination.
9p
vironald
15-12-2022
11
2
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YNU-5 (YFI type) is the first zeolite reported with interconnected 12-, 12-, and 8-ring pores showing a remarkable catalytic potential towards the dimethyl ether (DME)-to-olefin reaction. In this work, the structures of the as-synthesized, calcined and dealuminated YNU-5 zeolites, were investigated by various techniques with special emphasis on advanced electron microscopy methods.
8p
vironald
15-12-2022
6
2
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Separation of an aqueous mixture of 6-kestose/sucrose with zeolites: A molecular dynamics simulation
Extra-large pore zeolites are a small subset (21) among the whole list of 253 zeolites available. The discovery of new low-glycemic sugars is very attractive as new healthy additives in the food field. This is the case of the 6- kestose. In the present case, it appears in a mixture in aqueous solution together with sucrose, the separation of the mixture being necessary.
10p
vironald
15-12-2022
5
2
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Zeolite-templated synthesis of ordered microporous carbons was performed with Ca2+ ion-exchanged Y and beta zeolites, where the conventionally used carbon source gases (e.g., ethylene and propylene) were replaced by various organic solvents, such as methanol, ethanol, isopropanol, acetone, tetrahydrofuran, and diisopropyl ether.
9p
vironald
15-12-2022
8
2
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Ag-exchanged Y zeolites (Si/Al = 2.5; Ag/Al = 0.30–0.95) have been tested in the NH3–SCO reaction, the most promising method for the elimination of ammonia emissions, and deeply characterized before and after reaction by using a variety of techniques (XRD, TEM, UV–Vis, 109Ag NMR, XAS spectroscopies).
13p
vironald
15-12-2022
9
2
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