Three-Dimensional Transmission Electron Microscopic Observations of Mesopores in Dealuminated Zeolite Y

Janssen, A.H.; Koster, Abraham J.; Jong, Krijn P. de

doi:10.1002/1521-3773(20010316)40:6<1102::aid-anie11020>3.0.co;2-6

Cited by 303 publications

(169 citation statements)

References 21 publications

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“…1). Recently, 3D-transmission electron micrograph (TEM) tomography in combination with N 2 adsorption and mercury porosimetry demonstrated that a significant fraction of mesopores exists as isolated cavities inside the zeolite crystal [18,19].…”

Section: Post-synthetic Demetallation Of Zeolite Crystalsmentioning

confidence: 99%

Hierarchically Nanoporous Zeolites and Their Heterogeneous Catalysis: Current Status and Future Perspectives

Somorjai

2014

Catal Lett

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The research field of hierarchically nanoporous zeolites has been growing at an enormous pace over the past decades. Hierarchically nanoporous zeolites have versatile structural properties such as high surface area and large pore volume that can alleviate diffusional limitations of conventional zeolites with solely microporous framework. In this review, various synthesis strategies to hierarchically nanoporous zeolites and their structural advantages in catalytic reactions will be reviewed. In the first part, many novel synthetic approaches for hierarchically nanoporous zeolites such as post-demetallation, softtemplating, hard-templating, and dual-pore-generating surfactant-directed methods will be introduced. In the second part, catalytic applications of hierarchically nanoporous zeolites on various chemical reactions involving isomerization, cracking, alkylation and oxidation will be discussed. The present comprehensive review will provide future opportunities and perspectives on the research of hierarchically nanoporous zeolites including their applications to catalytic reactions.

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Section: Post-synthetic Demetallation Of Zeolite Crystalsmentioning

confidence: 99%

Hierarchically Nanoporous Zeolites and Their Heterogeneous Catalysis: Current Status and Future Perspectives

Somorjai

2014

Catal Lett

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“…It has been quantitatively shown, using electron tomography and image analysis, that the majority of mesopores is accessible from the outer surface of zeolite crystal through the mesopore network. This is in contrast with earlier tomography study of similar mesoporous USY where it was visually inferred that the blocked type of mesopores dominate [25]. These two opposing conclusions point to variation in textural properties amongst different batches of support material and the necessity for the quantitative approach when analyzing data.…”

Section: Resultsmentioning

confidence: 99%

“…However, measuring Pt diameters manually and determining their location from common TEM micrographs is very labor intensive and susceptible to errors due to the overlapping features in 2D projections. To overcome these shortcomings, electron tomography (ET, also referred to as 3D-TEM) has been successfully employed for visualizing the interior/ 3D morphology of a number of catalysts [11,[25][26][27][28][29][30][31][32][33][34]. The threedimensional reconstructions (intensity maps) that are obtained by ET can be subjected to automated image processing which enables quantitative analysis of the catalyst features [30][31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

H2PtCl6-derived Pt nanoparticles on USY zeolite: A qualitative and quantitative electron tomography study

Zečević¹,

Eerden²,

Friedrich³

et al. 2012

Microporous and Mesoporous Materials

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a b s t r a c tThe structural details of a bifunctional Pt/USY catalyst were studied using electron tomography. As a part of a fundamental study on the synthesis of Pt/USY catalyst, H 2 PtCl 6 precursor was used for the impregnation of USY zeolite support as a source of negatively charged PtCl 6 2À ions in order to restrict interaction with acidic sites of USY zeolite. After heat treatments, it was visualized in 3D that some Pt particles were 3-4 nm in size, while the majority maintained the size of 1.2-1.5 nm which corresponds to the diameter of the zeolite Y micropore cavities (1.2 nm). Electron tomography further revealed that 3-4 nm Pt particles seem to be entrapped in the zeolite crystal, without preferential location in mesopores or at the surface of the crystals. Quantitative image analysis provided the diameters (compared with EXAFS results) and the nearest neighbor distances of hundreds of imaged Pt particles.

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“…In electron tomography, acquisition of a tilt series over sufficiently large angles provides the opportunity to reconstruct the studied object in 3D. Over the last 5 years the first applications to materials science and catalysis have become apparent [27][28][29][30]. We summarize some studies and recent work from our laboratory.…”

Section: Electron Tomographymentioning

confidence: 99%

Support Materials and Characterization Tools for Nanostructured Catalysts

Jong¹

2006

Oil & Gas Science and Technology - Rev. IFP

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Résumé -Matériaux de support et outils de caractérisation des catalyseurs nanostructurés -Les matériaux de support nanostructurés considérés dans ce travail permettent de faciliter la recherche fondamentale en catalyse hétérogène. Des cas d'étude sont présentés, en particulier des catalyseurs d'hydrogénation à base de métaux supportés sur des nanofibres de carbone. La tomographie électronique s'avère être un outil de caractérisation important pour l'imagerie en trois dimensions de catalyseurs nanostructurés, avec une résolution nanométrique.Abstract -Support Materials and Characterization Tools for Nanostructured CatalystsNanostructured support materials are considered in this work as a means to facilitate fundamental research in heterogeneous catalysis. Case studies are presented, in particular carbon nanofiber supported metal catalysts for hydrogenation catalysis. Electron tomography is shown to be an important characterization tool to image nanostructured catalyst in three dimensions with nanometer resolution.Research Advances in Rational Design of Catalysts and Sorbents Avancées de la recherche dans la conception rationnelle de catalyseurs et d'adsorbants

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Three-Dimensional Transmission Electron Microscopic Observations of Mesopores in Dealuminated Zeolite Y

Cited by 303 publications

References 21 publications

Hierarchically Nanoporous Zeolites and Their Heterogeneous Catalysis: Current Status and Future Perspectives

Hierarchically Nanoporous Zeolites and Their Heterogeneous Catalysis: Current Status and Future Perspectives

H2PtCl6-derived Pt nanoparticles on USY zeolite: A qualitative and quantitative electron tomography study

Support Materials and Characterization Tools for Nanostructured Catalysts

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