A facile method to synthesize hierarchical nano-sized zeolite beta

Al-Eid, Manal; Ding, Lianhui; Saleem, Qasim; Badairy, Hameed Al; Sitepu, H.; Al-Malki, Abdullah

doi:10.1016/j.micromeso.2018.12.015

Cited by 22 publications

(18 citation statements)

References 23 publications

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“…[2] The materials, containing both micropores and mesopores, are referred as hierarchical zeolites or mesoporous zeolites. [2] A large variety of mesoporous zeolites [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] has been reported and they can be classified as follows: (i) zeolite crystals coated by a thin layer of mesoporous material, [3,4] (ii) micro-/ mesoporous nanocomposites with large domains of both micro-and mesoporous materials, [3,5] (iii) mesoporous materials containing small zeolitic fragments in the pore walls, [3,4,6] (iv) ordered [7] or disordered [8,9] mesoporous materials with zeolitic walls, (v) zeolite nanocrystals dispersed into a mesoporous materials with either amorphous or zeolitic walls, [10] (vi) nanocrystals [11,12] and nanosheets of zeolite aggregates. [13] Mesoporous zeolites with ordered MCM-41-like mesoporosity were prepared by micelle-templating of zeolites following different processes: (i) by a dissolution-reassembly process (e. g. ZSM-5, [5] mordenite, [3][4][5][6] beta [14] ), (ii) by a surfactant-templating process without dissolution (e. g. FAU-Y [7] ) and (iii) by a selfassembly process of nanozeolites precursor (e. g. beta [15] ) or zeolite seeds (e. g. ZSM-5 [16] ).…”

Section: Introductionmentioning

confidence: 99%

“…The tplot analysis method allows theoretically such calculations and it was applied in few studies of mesoporous zeolites but mainly to determine external surface areas and micropore volumes. [15,19,30,31] This method is however not straightforward. Indeed, computational studies proved that the t-plot method underestimates micropore volumes and overestimates mesopore surface areas of hierarchical micro-/mesoporous materials.…”

Section: Introductionmentioning

confidence: 99%

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Determination of Microporous and Mesoporous Surface Areas and Volumes of Mesoporous Zeolites by Corrected t‐Plot Analysis

et al. 2022

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Zeolites are well-known microporous catalysts involved in many industrial applications. Their microporosity yet impedes diffusion of bulky molecules. To overcome this drawback, zeolites with hierarchical bimodal porosity, e. g. micropores and mesopores, are developed. In this context, it is important to develop/use methods able to evaluate accurately the textural properties of mesoporous zeolites. t-Plot can be in theory used for determining the micro-and mesopore surface areas and pore volumes. However, classical t-plot analysis overestimates the mesopore surface areas and underestimates the micropore volumes for hierarchical micro-/mesoporous materials. Measurements performed with mechanical mixtures of FAU-Y and MCM-41 allows to provide corrections, which are up to date limited to mesoporous FAU-Y. The present work describes specific corrections of the t-plot for a broader series of zeolites including MFI, *BEA and MOR, based on a set of mechanical mixtures of zeolites and MCM-41. Minor correction factors are required for MOR, whilst for MFI and *BEA similar corrections as for the FAU-Y are inferred for the micropore volume. As far as the surface area is concerned higher correction factors are required for MFI compared to *BEA. This corrected t-plot analysis is applied to characterize a great variety of mesoporous zeolites prepared by micelle-templating.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Determination of Microporous and Mesoporous Surface Areas and Volumes of Mesoporous Zeolites by Corrected t‐Plot Analysis

et al. 2022

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“…[ 77 ] In both cases, the zeolite fraction is coated mostly in a reactive way onto the surfaces of the supporting material. In the main time many substrate materials in form of very different structural types with a wide variety of geometries (fibers, bead, nets, monoliths, plates), for example, such as ceramic honeycombs [ 211 ] and metallic or ceramic foams, [ 59,212,213 ] metal foams, [ 112,214 ] aluminum metal plates, [ 208 ] polymeric structures, [ 215 ] and inert or reactive packings like aluminum (oxides) or silica glass, [ 46,216,217 ] have been employed as the supports for the preparation of novel composites containing layers of various zeolite types (e.g., MFI, BEA, LTA, FAU, CHA).…”

Section: Hierarchical Zeolites: Preparation Concepts and Methodsmentioning

confidence: 99%

Hierarchically‐Ordered Zeolites: A Critical Assessment

Hartmann

Thommes²,

Schwieger

2021

Adv Materials Inter

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Hierarchically‐ordered zeolites have received increasing attention in the last 15 years due to their outstanding properties, which are explored in catalytic reaction with industrial relevance. Up to now, a large number of different synthetic strategies have been reported that allow to introduce an additional meso‐ or macropore system in addition to the intrinsic microporosity of classical zeolites. Thus, hierarchical zeolites combine the intrinsic (catalytic) properties of conventional zeolites with facilitated access and transport via the additional pore system. In this critical review, the various synthesis pathways reported so far are evaluated, several physico‐chemical methods required for in‐depth characterization of the hierarchical pore system are discussed, and selective applications that are or potentially will be of technical relevance are introduced. The present review provides a critical analysis of the present achievements and discusses future opportunities and challenges for the research on hierarchically‐ordered zeolite in particular with respect to their industrial use.

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“…[376] Next to P123, it is also possible to employ CTAB as mesoporogen, which was the case in a work from Al-Eid et al where an analogous method was employed in a one-pot synthesis. [377] The second method from Chaida-Chenni et al, however, executed an acidification of the beta seeds solution, without the use of an organic template. This method provided the best structured beta nanoparticles.…”

Section: Betamentioning

confidence: 99%

State of the Art and Perspectives of Hierarchical Zeolites: Practical Overview of Synthesis Methods and Use in Catalysis

et al. 2020

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Zeolites are highly crystalline aluminosilicates with welldefined pores that are constructed of SiO 2 and AlO 4 tetrahedra. These tetrahedra can be linked together in different unique ways to form various materials with a specific topology. [1] According to the International Zeolite Association (IZA), more than 250 different topologies, which are all assigned with a three-letter code, have been identified. [2] The micropores in zeolites are typically constructed from 8, 10, or 12 tetrahedral atoms

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A facile method to synthesize hierarchical nano-sized zeolite beta

Cited by 22 publications

References 23 publications

Determination of Microporous and Mesoporous Surface Areas and Volumes of Mesoporous Zeolites by Corrected t‐Plot Analysis

Determination of Microporous and Mesoporous Surface Areas and Volumes of Mesoporous Zeolites by Corrected t‐Plot Analysis

Hierarchically‐Ordered Zeolites: A Critical Assessment

State of the Art and Perspectives of Hierarchical Zeolites: Practical Overview of Synthesis Methods and Use in Catalysis

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