Advances and Environmental Aspects on the Synthesis of Hierarchical Zeolites Revisited: a state-of-the-art description

Rocha, Juliana De Gregori da; Macuvele, Domingos Lusitâneo Pier; Andrade, Cristiano José de; Riella, Humberto Gracher; Padoin, Natan; Soares, Cíntia

doi:10.1016/j.jece.2023.109397

Cited by 13 publications

(2 citation statements)

References 215 publications

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“…Conventional methodologies for zeolites synthesis have been extensively documented in the scientific literature [162]. However, numerous challenges exist, including the high expenses associated with structure-directing agents and starting materials, energy consumption and, recycling wastes.…”

Section: Cost-effective and Eco-friendly Synthesis Approachesmentioning

confidence: 99%

Hydroisomerization Catalysts for High-Quality Diesel Fuel Production

Aljajan,

Stytsenko,

Rubtsova

et al. 2023

Catalysts

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Upgrading the properties of diesel fractions is considered one of the crucial processes in the petrochemical industry; and for this purpose in laboratory-scale researching it is studied on the base of the hydroisomerization of n-hexadecane as a main model reaction. Recently, zeolite-based bifunctional catalysts have proven their efficiency due to their remarkable acidity, shape-selectivity and relative resistance to deactivation. In this review, different topological-type zeolite-based catalysts, the mechanism of their catalytic effect in n-C16 isomerization, and the principles of shape-selectivity are reviewed. A comparison of their structural-operational characteristics is made. The impact of some feedstock impurities on the catalyst’s performance and deactivation due to carbonaceous deposits as well as various modern eco-friendly cost-effective synthesis techniques are also discussed.

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Section: Cost-effective and Eco-friendly Synthesis Approachesmentioning

confidence: 99%

Hydroisomerization Catalysts for High-Quality Diesel Fuel Production

Aljajan,

Stytsenko,

Rubtsova

et al. 2023

Catalysts

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“…Significant progress has been made during the last 30 years in the field of synthesis of zeolite materials with improved diffusion characteristics, in particular, nanosized zeolites, 2D and 3D structures, and hierarchical materials with tailored properties for separation, purification, and catalysis, as well as sensing, optical and semiconducting applications, drug delivery, and imaging in biomedicine. The intense developments in this area have been a subject of numerous reviews. − Significant contribution to the field has been made by Svetlana Mintova, − to whom we wish to dedicate this manuscript.…”

Section: Introductionmentioning

confidence: 99%

Multinuclear MAS NMR Monitoring of the Effect of Silicate Speciation on the Mechanism of Zeolite BEA Formation: Toward Engineering of Crystal Size and Morphology

Ivanova

Andriako

Kostyukov

et al. 2023

Crystal Growth & Design

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Time-resolved in situ 13C, 27Al, and 29Si MAS NMR and ex situ XRD, X-ray fluorescence, and TG studies have been applied for the elucidation of the mechanisms of hydrothermal synthesis of zeolite BEA from a clear solution and a dense hydrogel. Isotopic labeling with 29Si and 13C isotopes has been used to follow the fate of siliceous species and structure-directing agent ((13CH3-CH3)4NOH)). The results point to different mechanistic pathways depending on silicate speciation in the initial reaction mixture: (i) an aggregation/nucleation process for the reaction mixture prepared from a colloidal silica source and (ii) solution-mediated crystallization for the reaction mixture prepared from a dense silica hydrogel. The products obtained have been characterized using a set of physicochemical methods including XRD, X-ray fluorescence analysis, TEM, low-temperature nitrogen adsorption–desorption, and NH3-TPD. The results demonstrate that the crystallization mechanism affects the crystal size and morphology: the aggregation/nucleation process leads to very tiny crystals with a size of 5–15 nm, whereas solution-mediated crystallization results in dense polycrystals with a size of 300–700 nm with the core enriched with Al. The evaluation of the catalysts in liquid-phase alkylation of benzene with propylene points to the higher activity of zeolite BEA obtained from a colloidal silica source.

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Tailor‐made production of mannosylerythritol lipids: From genetic modification to chemical synthesis

Saika,

Fukuoka

2024

J Americ Oil Chem Soc

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Mannosylerythritol lipids (MELs) are glycolipid biosurfactants produced by basidiomycetous yeasts. Mannosylerythritol lipids have received increasing attention because they not only have excellent interfacial activity but also have anti‐inflammatory and antimicrobial activity, and against cancer cell line, repair damaged skin, as carriers for drug delivery, and to interact with proteins. These properties are dependent on their structures; therefore, the tailored production of targeted MELs is required to obtain the desired properties. Over the past two decades, the genomes of MEL producers have been analyzed, revealing the MELs synthesis pathway and related genes. Using this information, it has become possible to tailor‐produce MELs by modifying the synthesis pathway. Furthermore, in recent years, novel chemical synthesis methods for MELs have been developed, enabling precise control over the fatty acid chain lengths of chemically synthesized MELs. This review compiles examples of the tailored production of MELs using methods ranging from the genetic modification of MELs producers to chemical synthesis methods.

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Advances and Environmental Aspects on the Synthesis of Hierarchical Zeolites Revisited: a state-of-the-art description

Cited by 13 publications

References 215 publications

Hydroisomerization Catalysts for High-Quality Diesel Fuel Production

Hydroisomerization Catalysts for High-Quality Diesel Fuel Production

Multinuclear MAS NMR Monitoring of the Effect of Silicate Speciation on the Mechanism of Zeolite BEA Formation: Toward Engineering of Crystal Size and Morphology

Tailor‐made production of mannosylerythritol lipids: From genetic modification to chemical synthesis

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