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Dec 28, 2023, 6:29:31 AM12/28/23
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Abstract:Catalytic behavior of alkali treated mordenite (H-MOR) in selective synthesis of ethylenediamine (EDA) via condensation amination of monoethanolamine (MEA) was investigated. Changes in the structural and acidic properties of alkali treated H-MOR were systematically investigated by N2 adsorption/desorption isotherms, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), temperature programmed ammonia desorption (NH3-TPD), pyridine adsorption was followed by infrared spectroscopy (Py-IR), and X-ray fluorescence (XRF) analyses. The results show that alkali treatment produces more opening mesopores on the H-MOR crystal surfaces and leads to an increase in the number of B acid sites and the strength of the acid sites. The mesopores effectively enhance the rate of diffusion in the bulk catalyst. Moreover, the B acid sites are active sites in selective synthesis of EDA. Due to improvements in the diffusion conditions and reactivities, alkali treated H-MOR shows an excellent catalytic performance under mild reaction conditions. The conversion of MEA was 52.8% and selectivity to EDA increased to 93.6%, which is the highest selectivity achieved so far. Furthermore, possible mechanism for the formation of EDA is discussed.Keywords: alkali treated H-MOR; monoethanolamine; ethylenediamine; condensation amination; mechanism

MAGIX ACID Pro 8.0.5 Build 226 Crack [Selective]


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The aim of this paper is to study the selective sorption behavior of nanosized EMT- and FAU-zeolites for human plasma proteins with different concentrations of either the zeolites or the human plasma proteins.

The APOC-III is adsorbed on the surface of both EMT- and FAU-zeolite nanoparticles (Figure S2). The positively charged amino acid residues of APOC-III and the negatively charged EMT- and FAU-zeolite nanoparticles facilitate the electrostatic interactions and thus the adsorption of APOC-III on the zeolite surfaces. Fibrinogen is a bipolar molecule with negatively charged E and D domains and positively charged αC-domain (PDB entry: 3GHG; Figure 6a). The αC-domain of fibrinogen Aα-chain (starts from amino acid 392 to 610) is highly flexible, mobile and positively charged31,32,33,34. This region shows positive electrostatic character, which is potentially responsible for the interaction between the fibrinogen and the negatively charged EMT- and FAU-zeolite nanoparticles. A schematic diagram of human fibrinogen structure and a flexible αC-domain of the fibrinogen are depicted in Figure 6b.

The selective adsorption of APOC-III on the surface of EMT- and FAU-zeolite nanoparticles is most likely via electrostatic interactions between the solvent exposed positively charged amino acid residues of APOC-III and the negatively charged EMT- and FAU-zeolites. Specifically, there are two regions in the structures of APOC-III, that the side chains of amino acid residues are solvent exposed and thus they can electrostatically interact with the negatively charged zeolite nanocrystals (Figure S2). The region including amino acid residues Lys17, His18, Lys21 and Lys24 and the area containing the solvent exposed amino acid residues Lys51, Lys58 and Lys60 are highly effective in binding to the negatively charged EMT- and FAU-zeolite nanoparticles42. Furthermore, APOC-III is an inhibitor of LPL activation and it is considered as a risk factor for cardiovascular diseases. The two types zeolites can potentially be used for selectively capture of APOC-III and to reduce the activation of lipoprotein lipase inhibition in hypertriglyceridemia treatment.

The application of in vivo plasma proteins (i.e. 100%) appeared to be essential for a strong binding of fibrinogen (all three chains) to the EMT- and FAU-zeolite nanoparticles. Fibrinogen D and E domains are rich in aspartic acid (Asp) and glutamic acid (Glu) residues and these sections are negatively charged. In contrast, the αC-domain (remaining part of carboxyl terminal of both alpha chains, which are not present in D domain) is positively charged because this region is rich in arginine (Arg) and lysine (Lys). The fibrinogen is a dipolar molecule and it can be one of the potential reasons that facilitate the adsorption of fibrinogen on the surface of negatively charged EMT- and FAU-zeolite nanoparticles. Importantly, a maximum concentration of fibrinogen is a guarantee for its strong adsorption to both zeolite nanoparticles. Since these two nanoparticles are negatively charged, it is possible that fibrinogen is linked to the surface of the zeolite nanoparticles via αC-domains, which are positively charged. Other possibility is that the fibrinogen molecules, which are dipolar (D and E domains are negatively charged and αC-domain positively charged) and very stable and hold tightly together. Most likely, the positive charged fibrinogen domain binds to the zeolite nanoparticles.

This study provides an evidence for high specific adsorption of APOC-III and fibrinogen on EMT- and FAU-zeolite nanoparticles. There are three factors, that determine the protein content of corona; 1- plasma concentrations, 2- the type of zeolite NPs (external surface area and hydrophilicity of zeolite nanocrystals) and 3- NPs concentrations (but less effect). Moreover, it was found that these NPs accelerate the time of blood clot formation, which can be adapted to hemophilic patients (hemophilia A (F-VIII deficient) and hemophilia B (F-IX deficient)) with a risk of bleeding and thus might be potentially used in combination with the existing therapy. Also, the zeolite nanoparticles can potentially be used for selectively capture of APOC-III in order to reduce the activation of lipoprotein lipase inhibition during hypertriglyceridemia treatment.

Since its first commercialization in 20101, methanol-to-olefins (MTO) over zeolitic catalyst has become the most important process producing light olefins (ethylene and propylene) from non-oil feedstocks such as coal, natural gas, biomass, and CO21,2,3,4,5. Despite essential progress achieved in both fundamental and applied research in the past decades, concurrently pursuing long catalyst lifetime and high light olefins selectivity in MTO remains an open challenge so far2,6. As an archetypical co-catalysis reaction, catalytic performance in MTO is manipulated by the organic intermediates confined in zeolite channels or cavities through the sophisticated hydrocarbon pool mechanism3,7,8,9. These hydrocarbon pool species (HCPs), typically including the methyled-benzene carbocations10,11 and cyclopentadienyl species12,13, are decisive for light olefins selectivity, owning to the altering of acidity14, reaction paths15, kinetics8,9, molecular transport16, and among others. However, the HCPs are also coke precursors that can readily evolve to polycyclic aromatic hydrocarbons (PAHs), the typical coke species, through cyclization17 and cross-linked mechanism18,19, accelerating catalyst deactivation20. Therefore, such dual-role of HCPs impedes achieving superior light olefins selectivity while maintaining long catalyst lifetime in MTO over zeolitic catalyst. In catalytic processes accompanying with catalyst deactivation by coke deposition, e.g., MTO and fluid catalytic cracking (FCC), air combustion or steam gasification21,22 has been used as common practices to eliminate coke for catalytic activity recovering. This unavoidably lowers light olefins selectivity because the active HCPs favoring light olefins formation in the catalyst have been meantime eliminated. However, the reinstitution of HCPs in nano-cavity of zeolite catalyst is of equal importance in recovering acidity and prompting light olefins selectivity. In this connection, a logical question follows: can the coke inevitably causing catalyst deactivation be selectively transformed to active HCPs?

We propose a feasible strategy to enhance the ethylene selectivity and carbon atom utilization during MTO reaction by selectively transforming coke species to active carbonaceous intermediates (naphthalenic cations) via steam cracking, which has been verified in both the laboratory-scale reactor and fluidized bed reactor-regenerator pilot plant. With the aid of DFT calculations, together with multiple spectroscopy techniques, e.g., GC-MS, MALDI FT-ICR MS, operando UV-Raman spectra and SIM, the steric stability and catalytic functionality of naphthalenic cations, profound insights of transformation of coke are depicted. Naphthalenic species, confined within CHA cavity not only serve as the active HCPs but also further limit the diffusion of large molecules. This synergic effect imposed by naphthalenic species promotes the selectivity of ethylene. This strategy is much more competitive than current commercial MTO process, with regards to the unexpectedly high light olefins selectivity and low CO2 emission. Especially the latter can avoid the emission of greenhouse gas and prevent significant loss of carbon in terms of atom economics. Given the fact that many heterogeneous catalytic reactions are autocatalytic, we expect that this established strategy will also be of high instructive for other heterogeneous catalytic processes.

However, conventional zeolite Y (Si/Al molar ratio below 2.5) application to petrochemical industry is limited due to the weak acidity, as well as poor hydrothermal stability. For the sake of better industrial realm application, conventional Y zeolite is replaced by a high silica ultrastable Y zeolite (USY, with Si/Al > 4) [8], prepared from various posttreatments which include steaming at elevated temperatures [9, 10], introduction of SiCl4 vapor at moderate temperatures [11], treatment with ammonium hexafluorosilicate [12], and chelating agents [13]. Unfortunately, these posttreatments methods require several posttreatments and heat treatment often leads to structure being distorted.

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