Effect of Mesoporosity on Methanol‐to‐Olefin Reactions over Organosilane‐Directed Mesoporous <scp>SSZ</scp>‐13 Zeolites

Lee, Hae Sol; Nam, Sung Chan; Jo, Changbum

doi:10.1002/bkcs.12049

Cited by 5 publications

(3 citation statements)

References 28 publications

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“…Proton‐forms of CHA zeolites were hydrothermally prepared using N,N,N‐trimethyl‐1‐adamantylammonium hydroxide as the zeolite structure‐directing agents (SDA) according to a previously reported method [11] . As shown in SEM image, the CHA zeolites were obtained in irregular‐shaped crystallites with a particle diameter of 100 nm to 500 nm (Figure S1) and had a Si/Al ratio of 13, which was confirmed by inductively coupled plasma (ICP) analysis.…”

Section: Resultsmentioning

confidence: 99%

Mercaptoamine‐assisted Post‐encapsulation of Metal Nanoparticles within Preformed Zeolites and their Analogues for Hydroisomerization and Methane Decomposition

et al. 2023

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We report a general synthetic strategy for post‐encapsulation of metal nanoparticles within preformed zeolites using post‐synthetic modification. Both anionic and cationic precursors to metal nanoparticle are supported on 8‐ and 10‐membered ring zeolites and analogues during wet impregnation using 2‐aminoethanethiol (AET) as a bi‐grafting agent. Thiol groups are coordinated to metal centers, whereas amine moieties are dynamically attached to micropore walls via acid‐base interactions. The dynamic acid‐base interactions cause the even distribution of the metal‐AET complex throughout the zeolite matrix. These processes encapsulate Au, Rh, and Ni precursors within the CHA, *MRE, MFI zeolite, and SAPO‐34 zeolite analogues, for which small channel apertures preclude the post‐synthesis impregnation of metal precursors. Sequential activation forms small and uniform nanoparticles (1–2.5 nm in diameter), as confirmed through electron microscopy and X‐ray absorption spectroscopy. Containment within the small micropores protected the nanoparticles against harsh thermal sintering conditions and prevented the fouling of the metal surface by coke, thus resulting in a high catalytic performance in n‐dodecane hydroisomerization and methane decomposition. The remarkable specificity of the thiol to metal precursors and the dynamic acid‐base interaction make these protocols extendable to various metal‐zeolite systems, suitable for shape‐selective catalysts in challenging chemical environments.

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Section: Resultsmentioning

confidence: 99%

Mercaptoamine‐assisted Post‐encapsulation of Metal Nanoparticles within Preformed Zeolites and their Analogues for Hydroisomerization and Methane Decomposition

et al. 2023

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“…As a result, high-molecularweight aromatics and paraffins (C 5 -C 7 ) are formed selectively on medium and large-pore zeolites. [68] The MTH process is widely used to synthesize several different categories of hydrocarbons, including light olefins (methanol to olefins, MTO), [69,70] gasolinerange hydrocarbons (methanol to gasoline, MTG), [71,72] propylene (methanol to propylene, MTP), [73,74] or aromatics (methanol to aromatics, MTA). [75,76] The methanol-to-olefin (MTO) process, which converts methanol to ethylene and propylene, is an important chemical technology that utilizes methanol synthesized from coal or natural gas as its raw material.…”

Section: Methanol To Hydrocarbonsmentioning

confidence: 99%

“…As a result, high‐molecular‐weight aromatics and paraffins (C 5 ‐C 7 ) are formed selectively on medium and large‐pore zeolites [68] . The MTH process is widely used to synthesize several different categories of hydrocarbons, including light olefins (methanol to olefins, MTO), [69,70] gasoline‐range hydrocarbons (methanol to gasoline, MTG), [71,72] propylene (methanol to propylene, MTP), [73,74] or aromatics (methanol to aromatics, MTA) [75,76] …”

Section: Catalytic Reaction Using Hierarchical Zeolitementioning

confidence: 99%

Methods for Preparing Hierarchical Zeolites by Chemical Etching and Their Catalytic Applications: A Review

et al. 2023

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Zeolites are widely used in petrochemical processes and refineries due to their well‐ordered microporous network and large surface area. However, the diffusion of reactants and products is hampered by the narrow microporous channels, causing limitations. To overcome this challenge, modifying the pore structure is crucial, and the chemical etching technique is a powerful tool that introduces mesopores and macropores, consequently enhancing mass transfer and accessibility. Diverse chemical etching methods have been invented, including exposure to both acids (organic/inorganic acids), alkali (organic/inorganic alkali), and neutral etchants (e. g., ammonium fluoride). This review summarizes and assesses the chemical etching methods and their relevance to catalytic cracking reactions, methanol to hydrocarbons (MTH), and biomass conversion. The potential of zeolites with modified pore structures has motivated researchers to develop novel methods to tackle the practical challenges associated with their applications.

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Mercaptoamine‐assisted Post‐encapsulation of Metal Nanoparticles within Preformed Zeolites and their Analogues for Hydroisomerization and Methane Decomposition

et al. 2023

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View full text Add to dashboard Cite

We report a general synthetic strategy for post-encapsulation of metal nanoparticles within preformed zeolites using post-synthetic modification. Both anionic and cationic precursors to metal nanoparticle are supported on 8-and 10membered ring zeolites and analogues during wet impregnation using 2-aminoethanethiol (AET) as a bi-grafting agent. Thiol groups are coordinated to metal centers, whereas amine moieties are dynamically attached to micropore walls via acid-base interactions. The dynamic acid-base interactions cause the even distribution of the metal-AET complex throughout the zeolite matrix. These processes encapsulate Au, Rh, and Ni precursors within the CHA, *MRE, MFI zeolite, and SAPO-34 zeolite analogues, for which small channel apertures preclude the post-synthesis impregnation of metal precursors. Sequential activation forms small and uniform nanoparticles (1-2.5 nm in diameter), as confirmed through electron microscopy and X-ray absorption spectroscopy. Containment within the small micropores protected the nanoparticles against harsh thermal sintering conditions and prevented the fouling of the metal surface by coke, thus resulting in a high catalytic performance in n-dodecane hydroisomerization and methane decomposition. The remarkable specificity of the thiol to metal precursors and the dynamic acid-base interaction make these protocols extendable to various metal-zeolite systems, suitable for shape-selective catalysts in challenging chemical environments.

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Effect of Mesoporosity on Methanol‐to‐Olefin Reactions over Organosilane‐Directed Mesoporous SSZ‐13 Zeolites

Cited by 5 publications

References 28 publications

Mercaptoamine‐assisted Post‐encapsulation of Metal Nanoparticles within Preformed Zeolites and their Analogues for Hydroisomerization and Methane Decomposition

Mercaptoamine‐assisted Post‐encapsulation of Metal Nanoparticles within Preformed Zeolites and their Analogues for Hydroisomerization and Methane Decomposition

Methods for Preparing Hierarchical Zeolites by Chemical Etching and Their Catalytic Applications: A Review

Mercaptoamine‐assisted Post‐encapsulation of Metal Nanoparticles within Preformed Zeolites and their Analogues for Hydroisomerization and Methane Decomposition

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