Aldol condensation of biomass-derived platform molecules over amine-grafted hierarchical FAU-type zeolite nanosheets (Zeolean) featuring basic sites

Yutthalekha, Thittaya; Suttipat, Duangkamon; Salakhum, Saros; Thivasasith, Anawat; Nokbin, Somkiat; Limtrakul, Jumras; Wattanakit, Chularat

doi:10.1039/c7cc06375j

Cited by 43 publications

(52 citation statements)

References 24 publications

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“…For example, hierarchical FAU and LTA-type zeolites and mesoporous zeolite ETS-10 prepared and tested in Knoevengal condensation of aldehydes as well as for synthesis of α, β-epoxy ketones, have demonstrated a higher catalytic activity as compared to the parent catalysts [36][37][38] . Parallel to these studies, novel amine-grafted hierarchical zeolites have been successfully synthesised and evaluated as potential catalysts for the aldol condensation of 5hydroxymethylfurfural 39 .…”

Section: Introductionmentioning

confidence: 99%

Nanostructured Zeolites: The Introduction of Intracrystalline Mesoporosity in Basic Faujasite-type Catalysts

Al‐Ani

Darton

Sneddon

et al. 2017

ACS Appl. Nano Mater.

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A combination of post-synthesis modifications and ion-exchange aiming to obtain basic cation-rich hierarchical zeolites X and Y was utilised in this work for the preparation of catalysts for biofuel production from vegetable oils. The secondary mesopore system with a narrow pore size distribution in the 4 nm range was introduced by successive acid and base treatments accompanied with surfactant templating. This was followed by ion-exchange with Cs + and K + cations to produce strong basic catalysts. The prepared hierarchical zeolites have been characterised by X-ray diffraction (XRD), scanning electron microscopy (SEM), nitrogen adsorption, Fourier transform infrared spectroscopy (FTIR) and solid state NMR. The transesterification reaction over the zeolite catalysts was carried out in a microwave batch-type reactor and the effects of the reaction conditions, basic properties and pore structure of the hierarchical faujasites were studied in details. The conversion of triglycerides increased with increasing concentration of Cs and K in modified zeolites, but declined with decreasing framework aluminium content. The balance between the strength of the basic sites and their accessibility in hierarchical zeolites and its effect on the catalytic performance of these nanostructured materials is discussed.

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Section: Introductionmentioning

confidence: 99%

Nanostructured Zeolites: The Introduction of Intracrystalline Mesoporosity in Basic Faujasite-type Catalysts

Al‐Ani

Darton

Sneddon

et al. 2017

ACS Appl. Nano Mater.

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“…To circumvent this problem, the rational design of hierarchical FAU nanosheets is one of the most promising strategies to create the additional mesoporosity due to interstitial mesopores between nanolayers . Recently, there have been several reports on the advantages of such materials, in particular, improved catalytic activities and catalyst lifetime for catalytic applications of bulky molecules …”

Section: Methodsmentioning

confidence: 99%

“…[6][7] Recently, there have been several reports on the advantages of such materials, in particular, improved catalytic activities and catalyst lifetime for catalytic applications of bulky molecules. [7][8] Although acid FAU (H-FAU) nanosheets may have significant advantages in acid catalytic processes, the inherent problems of their thermal/hydrothermal stabilities have been contributed due to the Al-rich framework. [6a,9] Over the past few decades, there are many developed methods that have been described in order to improve the stability of zeolites, [10] such as hydrothermal treatment, [11] desilication, [12] dealumination [13] and the combination of desilication and dealumination methods.…”

Section: Tunable Acid-base Bifunction Of Hierarchical Aluminum-rich Zmentioning

confidence: 99%

Tunable Acid‐Base Bifunction of Hierarchical Aluminum‐Rich Zeolites for the One‐Pot Tandem Deacetalization‐Henry Reaction

et al. 2019

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The development of bifunctional catalysts is important in the synthesis of materials for multiple sequential reactions in one‐pot tandem catalytic processes. In this context, a dealuminated acid‐base bifunctional catalyst with a hierarchical aluminum‐rich faujasite structure (zeolite Y) has been successfully prepared by the solid‐state dealumination of NaX nanosheets with ammonium hexafluorosilicate (AHFS). The characteristic properties of catalysts were examined by means of XRD, SEM, TEM, N2 physisorption technique, ICP‐OES, NH3‐TPD, CO2‐TPD, 27Al NMR, 29Si NMR, Al K‐edge XANES, and Pyridine‐FTIR. The materials exhibit a superior catalytic performance for one‐pot tandem catalysis, for example, the synthesis of trans‐β‐nitrostyrene with a yield close to 100 % in a tandem deacetalization‐Henry reaction of benzaldehyde dimethyl acetal with nitromethane. The high catalytic performance is attributed to the facile transfer of bulky molecules between acid and basic sites in the presence of hierarchical structures.

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“…Moreover, the synthesis of other zeolite nanosheets or nanolayers such as faujasite (FAU), ferrierite (FER) and Zeolite Socony Mobil -twelve (MTW) zeolite frameworks has been demonstrated [32][33][34][35][36][37]. TPOAC is one of the most promising mesoporogens, which is widely used in zeolite synthesis.…”

Section: Synthesis Of Hierarchical Zeolite Nanosheetsmentioning

confidence: 99%

“…For example, recently FAU zeolite nanosheets were successfully prepared by using an organosilane-surfactant, and TPOAC, as a structure-directing agent. The morphologies and textural properties can be varied by the surfactant content and the crystallization temperature [33,34]. Interestingly, the corn cob ash can also be used as the silica source instead of a commercial sodium silicate to synthesize FAU zeolite nanosheets [35].…”

Section: Synthesis Of Hierarchical Zeolite Nanosheetsmentioning

confidence: 99%

A Comprehensive Review of the Applications of Hierarchical Zeolite Nanosheets and Nanoparticle Assemblies in Light Olefin Production

Dugkhuntod

Wattanakit

2020

Catalysts

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Light olefins including ethylene, propylene and butylene are important building blocks in petrochemical industries to produce various chemicals such as polyethylene, polypropylene, ethylene oxide and cumene. Traditionally, light olefins are produced via a steam cracking process operated at an extremely high temperature. The catalytic conversion, in which zeolites have been widely used, is an alternative pathway using a lower temperature. However, conventional zeolites, composed of a pure microporous structure, restrict the diffusion of large molecules into the framework, resulting in coke formation and further side reactions. To overcome these problems, hierarchical zeolites composed of additional mesoporous and/or macroporous structures have been widely researched over the past decade. In this review, the recent development of hierarchical zeolite nanosheets and nanoparticle assemblies together with opening up their applications in various light olefin productions such as catalytic cracking, ethanol dehydration to ethylene, methanol to olefins (MTO) and other reactions will be presented.Catalysts 2020, 10, 245 2 of 15 windows, they can be divided into three different categories including large porous, medium porous and small porous zeolites, which are composed of a different number of tetrahedral units, or T atoms of 12, 10 and 8 membered rings, respectively. These behaviors make each zeolite serving unique shape selective properties, which are very important for the appropriate applications.Although there are several above-mentioned promising properties of zeolites, they are typically composed of a very small microporous structure, eventually resulting in some disadvantages of the diffusion limitation of guest molecules inside the framework. Some bulky molecules cannot easily penetrate into active sites located at microporous channels, and therefore a poor catalytic performance due to a very low reaction rate and a fast deactivation of catalysts is observed. To overcome these limitations and to improve the accessibility of molecules into active sites, in recent years modified zeolites obtained by introducing additional larger porous structures have been extensively developed [5][6][7][8].It is well known that hierarchical zeolites, composed of at least two levels of porous structures such as microspores and mesopores, microspores and macropores, and micropores/mesopores and macropores have been extensively studied and developed. Their microporous (<2 nm), mesoporous (2-50 nm) and/or macroporous (>50 nm) structures are well connected to each other. In this case, the additional larger porous structures can improve diffusion limitation, molecular transportation and coke deposition [9]. In the past decade, there have been several studies regarding the synthesis of hierarchical zeolites to overcome these problems. Herein, this comprehensive review opens up perspectives of the recent synthesis approaches of hierarchical zeolite nanosheets and nanoparticle assemblies, as well as the successful production of light olef...

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Aldol condensation of biomass-derived platform molecules over amine-grafted hierarchical FAU-type zeolite nanosheets (Zeolean) featuring basic sites

Cited by 43 publications

References 24 publications

Nanostructured Zeolites: The Introduction of Intracrystalline Mesoporosity in Basic Faujasite-type Catalysts

Nanostructured Zeolites: The Introduction of Intracrystalline Mesoporosity in Basic Faujasite-type Catalysts

Tunable Acid‐Base Bifunction of Hierarchical Aluminum‐Rich Zeolites for the One‐Pot Tandem Deacetalization‐Henry Reaction

A Comprehensive Review of the Applications of Hierarchical Zeolite Nanosheets and Nanoparticle Assemblies in Light Olefin Production

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