Molecular shape-selectivity of MFI zeolite nanosheets in n-decane isomerization and hydrocracking

Verheyen, Elke; Jo, Changbum; Kurttepeli, Mert; Vanbutsele, Gina; Gobechiya, Elena; Korányi, Tamás I.; Bals, Sara; Tendeloo, Gustaaf Van; Ryoo, Ryong; Kirschhock, Christine; Martens, Johan A.

doi:10.1016/j.jcat.2012.12.017

Cited by 136 publications

(74 citation statements)

References 53 publications

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“…This selectivity improvement was due to the short diffusion way for branched products to get away before cracking process. 177,178,179 The results are perfectly in line with the previous hydroisomerization -hydrocracking results on bi-functional catalysts obtained with ITQ-2.…”

supporting

confidence: 91%

Layered zeolitic materials: an approach to designing versatile functional solids

2014

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supporting

confidence: 91%

Layered zeolitic materials: an approach to designing versatile functional solids

2014

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“…As the size of model hydrocarbon increased, the reactant diffusion should be affected by the size of zeolite crystals more significantly. A series of MFI zeolite nanosheets with controlled average thickness of 2 and 8 nm was tested for n-decane isomerization [105], which showed molecular shape-selectivity according to the crystal thickness. Nanosheet-type ITQ-2 zeolite was prepared by dealumination of layered zeolite precursors with FER framework structure, and this material was used for the hydroisomerization of n-hexadecane at 400°C in comparison with conventional FER zeolite having only micropores [106].…”

Section: Hydrocarbon Isomerizationmentioning

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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“…Catalyst design at the nanoscale level with a hierarchical porosity is essential for obtaining the best operating performances. [3][4][5] As an example on Fischer-Tropsch synthesis, the introduction of mesoporosity in Co/ZSM-5 increases the activity and selectivity to the gasoline fraction (C5-C11) leading to an enhanced octane number due to the isomerization reactions. [6][7][8] When the metal particles are embedded into porous matrices, such as core-shell structures, the reactants must diffuse first through the porous layer before reaching the metal center, leading to high selectivity by molecular sieving mechanisms.…”

Section: ■ Introductionmentioning

confidence: 99%

Transition-Metal Nanoparticles in Hollow Zeolite Single Crystals as Bifunctional and Size-Selective Hydrogenation Catalysts

et al. 2014

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Transition-metal nanoparticles (Co, Ni, and Cu) encapsulated in hollow zeolite single crystals were prepared by recrystallization of impregnated bulk MFI crystals in the presence of tetrapropylammonium (TPAOH) solutions. The size and number of particles in hollow MFI depended mainly on the aluminum content. The encapsulation of the nanoparticles prevented them from growing, thus enabling the control of particle size even after high temperature treatments. For low metal loadings (<3 wt %), the mean particle sizes for Co, Ni, and Cu in hollow silicalite-1 were 3.5 ± 0.3, 3.1 ± 0.5, and 1.5 ± 0.2 nm, respectively. In the case of hollow ZSM-5, higher loadings (∼8 wt %) could be obtained with mean particle sizes of 17 ± 2 nm, 13 ± 2 nm, and 15 ± 2 nm for Co, Ni, and Cu systems. The mechanism of transition metal nanoparticle formation was markedly different from that of noble metals. At high pH values, transition-metal cations first reacted with dissolved silica species yielding fibrous metal phyllosilicates that were located inside the crystal cavities. The metal phyllosilicates were then converted into nanoparticles upon reduction under H2 at high temperature (500–750 °C). Silicalite-1 encapsulated Ni particles were used in the catalytic hydrogenation of substituted benzenes and showed an outstanding size-selectivity effect. Ni particles were accessible to toluene but not to mesitylene, confirming that the activity is directly related to the diffusion properties of molecules through the zeolite membrane.

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Molecular shape-selectivity of MFI zeolite nanosheets in n-decane isomerization and hydrocracking

Cited by 136 publications

References 53 publications

Layered zeolitic materials: an approach to designing versatile functional solids

Layered zeolitic materials: an approach to designing versatile functional solids

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

Transition-Metal Nanoparticles in Hollow Zeolite Single Crystals as Bifunctional and Size-Selective Hydrogenation Catalysts

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