قائمة الطعام
Selective adsorption of ethane from a mixture of ethane (C2H6) and ethylene (C2H4) has emerged as an energy-efficient process for obtaining high-purity ethylene. Recently, it has been reported that some novel microporous organometallic and organic adsorbents can preferentially adsorb C2H6 over C2H4. Conversely, zeolite …
The zeolite-supported catalyst requires several hours until it is fully saturated, whereas oxidation of the adsorbed ethylene by plasma-catalysis occurs in a relatively short time. In agricultural storage, a considerable amount of water vapor inevitably coexists with ethylene, and competes with ethylene for the same active sites.
ethylene than other treatments, namely 113 ppm/g/h. However, discoloration of the nano zeolite-KMnO4 during oxidizes ethylene is not too clear to be observed, thus difficult to make nano zeolites- KMnO4 as an indicator of the shelf life of fruit. Application of nano zeolite-KMnO4 as much as 3 grams packaged in cellulose paper (@
International Manufacturers and Suppliers. Albemarle. Speciality zeolites - [e] Clariant. Advanced zeolite powders - [e] Quantachrome Instruments. ... is a world leader in the …
Abstract. Home-made NaA zeolite membranes were used for pervaporation dehydration of ethylene glycol (EG)/water mixtures. Hydrothermal stability of the membranes in pervaporation was investigated for industrial application purpose. The membranes exhibited good stability for water content of less than 20 wt.% at 100 °C.
The selective hydrogenation of acetylene in the presence of ethylene has been studied on K+ exchanged {beta}-zeolite supported Pd and PdAg catalysts. Results from batch reactor studies with Fourier transform infrared spectroscopy (FTIR) have shown that the K+-{beta}-zeolite support is more selective than the Al2O3 or Na+-{beta}-zeolite …
ZSM-2 zeolite [33], [34] is a type of nanosized zeolite that can be obtained with a mean crystal size ranging from about 40 to 200 nm [35], and it has been described as an intergrowth of cubic FAU and hexagonal EMT zeolite-type structures [36], [37]. ZSM-2 zeolite consists of 12-membered ring pore openings of ∼0.74 nm in diameter. In addition ...
Considering the ethylene scavenging activity of zeolite, a novel ZIF-8 (zeolitic imidazolate framework)/zeolite composite was developed to make use of ZIF-8's distinctive porous nanostructure and stability. The ZIF-8/ZEO composite had a better affinity to absorbing ethylene compared to the parent components. The ZIF-8 with 5 g of zeolite …
We provide a variety of zeolite cracking catalysts that provide an excellent balance between the desired yield targets, product properties, and long life. Custom powders and catalysts …
The ethylene adsorption isotherms indicated that only zeolite modified with PTAB could significantly enhance the ethylene adsorption capacity. Zeolite NaY modified with 0.5mM PTAB was the best ...
3.2 Introduction. Alkylation of aromatics, such as benzene and toluene, with ethylene and propylene is a. key reaction in the petrochemical industry to produce cumene, ethylbenzene, and ethyl toluene. These chemicals are important intermediate products to form phenol, styrene, and acetone, which.
Meanwhile, the adsorbed ethylene moves to the zeolite framework with a C4 O1 length of 3.908 Å. As shown in Table 2, the activation energies of E act1 and E act2 in the two steps are 12.09 and 15.23 kcal/mol, respectively. Contrary to the situation in HMOR and HBEA zeolite, the second step is the rate-determining one in HMCM-22. ...
(3), (4) (Table 4), both results reveal a higher condensation degree as well as higher coke particle size of the structured coke on HZSM-5 zeolite in comparison to the coke on SAPO-34, this difference being more significant in the transformation of ethylene. Nevertheless, slight differences are observed in the Raman spectra between both …
Low pressure oligomerization of ethylene diluted in syngas and N 2 at 325 °C. High ethylene conversion (>80 %) and gasoline yield of 40 % at ethylene partial pressure of 0.33 bar. Ethylene dilution limits the extent of reaction steps and also coke formation. Syngas dilution hinders the formation of aromatics (dehydrocyclization …
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This work combines kinetic, spectroscopic, and theoretical methods to understand mechanistic details of toluene alkylation with ethylene on acidic MOR zeolite, chosen due to its industrial relevance in producing ethyltoluene. In doing so, we show that the protons in the small eight-membered-ring (8-MR) micropores are inaccessible to …
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Nano zeolite -KMnO4 from grinding for 40 minutes and chemical activation with KOH solution for 2 hours has the highest ability to oxidize ethylene than other treatments, namely 113 ppm/g/h.
Aluminum-containing titanium silicalite-1 zeolite (Al-TS-1) is an important bifunctional catalyst for green production of ethylene glycol (EG) via a hydrogen peroxide/ethylene process (HPEG). In this work, hydrothermal post-treatments are carried out to a parent Al-TS-1 in (NH 4 ) 2 CO 3 aqueous solutions under varied conditions to …
They found that the Co- and Ni-SSZ-13 zeolites showed the highest CO 2 capture and CO 2 /N 2 selectivity. To the best of our knowledge, the adsorptive properties of SSZ-13 zeolite have not been studied in literature for ethylene/ethane separation. Thus, in the present work, Na-SSZ-13 zeolite crystals are synthesized, then the obtained zeolites ...
The XRD profiles (Fig. 2 a) show that the three Ni/zeolite catalysts had identical characteristic peaks for the MFI structure in the ranges of 6°–9° and 22°–25°, indicating that a ZSM-5 structure was successfully formed in all the synthesized catalysts.The appearance of weak diffraction peaks at 2θ of 37.1° and 43.7° for Ni/CM …
Selective adsorption of ethane from a mixture of ethane (C2H6) and ethylene (C2H4) has emerged as an energy-efficient process for obtaining high-purity …
The conversion of ethane to ethylene is crucial for deriving platform chemicals from non-petroleum feedstock. However, it currently relies on steam cracking technology, which involves high temperatures and large reactors. ... Recent studies show that rational design of catalysts, such as fixing metal nanoclusters within zeolite …
The pyrolysis of poly (ethylene terephthalate) (PET) in the presence of ZSM-5 zeolite and NiCl2 as a catalyst was studied at different temperatures under N2 atmosphere. Quantitative 13C nuclear magnetic resonance (NMR) and Fourier transform infrared spectroscopy (FT-IR) were applied to characterize the waxy and solid residue. …
Size-controlled synthesis of MCM-49 zeolite (MWW, SiO 2 /Al 2 O 3 > 20) was achieved in presence of parent zeolite NaX (FAU, SiO 2 /Al 2 O 3 = 2.5), hexamethyleneimine (HMI), NaOH and SiO 2, with d6r as a common composite building unit between FAU (d6r and sod) and MWW (d6r and mel) structure.The samples …
Theoretical calculations have shown that the BEA zeolite has a higher activation barrier for the stepwise mechanism. 23 Meanwhile, the channels and intersections in the 10-membered rings of MFI provide sufficient confinement within the zeolite to initiate ethylene oligomerization, which is less effective in the larger 12 …
As a result, interactions among active adsorption surface sites of zeolite and ethylene molecules are identified and a surface adsorption mechanism is proposed. 2. Materials and methods2.1. Materials. Chilean natural zeolite (53% clinoptilolite, 40% mordenite and 7% quartz) was provided by Minera Formas. Argon (99.9% purity) was …
In terms of alkaline earth metals, Wakui et al. studied the effect of alkaline earth modification on the catalytic cracking of n-butane [32].NH 3-TPD results indicated that the strong acid sites in the modified ZSM-5 zeolites were transformed into the weak ones.Although the overall activity of the modified zeolite was decreased, the yield of …
The zeolite that displayed the best ethylene adsorptivity was the zeolite that was modified by the simultaneous modification method. The ethylene adsorption was raised from 82.5 cm3 g−1 for the ...
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