Hydrothermal synthesis of MWW-type stannosilicate and its post-structural transformation to MCM-56 analogue

Liu, Guanqi; Jiang, Jingang; Yang, Boting; Fang, Xiangqing; Xu, Hao; Peng, Honggen; Xu, Le; Liu, Yueming; Wu, Peng

doi:10.1016/j.micromeso.2012.08.025

Cited by 40 publications

(37 citation statements)

References 39 publications

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“…[50] For example, it was previously reported that Sn-MFI was almost inactive in the B-V oxidation with TBHP as the oxidant due to severe diffusion constraints. [51] However, the activity of USY@ZnO/Al 2 O 3 with higher Zn contents (14.6 and 20.9 wt %) and the IM-ZnO/ USY catalysts was inferior to the USY zeolite,d ue to al ower amount of efficient acidity to act as active sites and al ower specific area and pore volume. [51] However, the activity of USY@ZnO/Al 2 O 3 with higher Zn contents (14.6 and 20.9 wt %) and the IM-ZnO/ USY catalysts was inferior to the USY zeolite,d ue to al ower amount of efficient acidity to act as active sites and al ower specific area and pore volume.…”

Section: Catalytic Performanceofu Sy@zno/al 2 O 3 Materials In B-v Oxmentioning

confidence: 97%

“…[43] Consequently,w hen the reaction proceeded with TBHP in decane, the USY@ZnO/Al 2 O 3 catalysts with Zn contents of 3.2 and 7.8 wt %e xhibited ah igher conversion than that of the pristine USY zeolite;i np articular the USY@ZnO/Al 2 O 3 -7.8 catalyst showed ap erformance comparable to that of the reported Sn-zeolite catalyst. [51] However, the activity of USY@ZnO/Al 2 O 3 with higher Zn contents (14.6 and 20.9 wt %) and the IM-ZnO/ USY catalysts was inferior to the USY zeolite,d ue to al ower amount of efficient acidity to act as active sites and al ower specific area and pore volume. For TBHP in water (65 wt %), the ketone conversionf or all the catalysts decreased remarkably due to the competitive adsorption of water molecules versus organic substrate in catalysts that contained ah ydrophilic zeolite component.…”

Section: Catalytic Performanceofu Sy@zno/al 2 O 3 Materials In B-v Oxmentioning

confidence: 97%

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Controllably Confined ZnO on USY Zeolites (USY@ZnO/Al₂O₃) as Efficient Lewis Acid Catalysts for Baeyer–Villiger Oxidation

Wang

Ding

et al. 2018

Chemistry An Asian Journal

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A ZnAl-LDHs (layered double hydroxides) phase was readily formed on the surface of a USY zeolite through a distinctive in situ growth method that benefitted from the interaction of the added Zn source and aluminum species extracted from the Al-rich USY zeolite crystals. The migration of aluminum and simultaneous interaction with the external Zn source took place in one pot to form a ZnAl-LDHs phase coated on the surface of the USY crystals. Upon calcination, the ZnAl-LDHs phase was transformed into a ZnO/Al O composite that was still firmly anchored on the USY zeolite, without sacrificing the core-shell structure. The resultant USY@ZnO/Al O materials gave rise to unique Lewis acidity and hierarchical porosity, which endowed the catalyst with promising performance in the Baeyer-Villiger oxidation of ketones with H O or bulky tert-butyl hydroxide as an oxidant.

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Section: Catalytic Performanceofu Sy@zno/al 2 O 3 Materials In B-v Oxmentioning

confidence: 97%

Section: Catalytic Performanceofu Sy@zno/al 2 O 3 Materials In B-v Oxmentioning

confidence: 97%

Controllably Confined ZnO on USY Zeolites (USY@ZnO/Al₂O₃) as Efficient Lewis Acid Catalysts for Baeyer–Villiger Oxidation

Wang

Ding

et al. 2018

Chemistry An Asian Journal

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“…developed a “re‐growth” method for preparing Sn‐MWW, which was highly active for the conversion of trioses to methyl lactate and lactic acid . Hydrothermal synthesis of Sn‐MWW and its transformation to an MCM‐56 analog were reported by Wu's group . Zones et al.…”

Section: Nomenclature and Description Of Synthesized Materialsmentioning

confidence: 99%

Pillared Sn‐MWW Prepared by a Solid‐State‐Exchange Method and its Use as a Lewis Acid Catalyst

et al. 2016

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Pillared Sn‐MWW (Sn‐MWW(SP)‐SSE) was prepared through a solid‐state‐exchange (SSE) route. The pillared structure was inherited from pillared B‐MWW, and Sn was inserted in the framework by boron leaching and solid‐state‐exchange with tin tetrachloride pentahydrate. The Sn‐MWW(SP)‐SSE with framework Sn sites exhibits Lewis acidity and good catalytic performance for the Baeyer–Villiger oxidation, and mono‐ and disaccharide isomerizations.

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“…[ 143 ] Owing to the benefi t of high accessibility of Ti active sites, the delaminated Del-Ti-MWW catalyst proved to be superior to TS-1, Ti-Beta, Ti-MWW and even mesoporous Ti-MCM-41 in the epoxidation of a wide range of bulky alkenes with H 2 O 2 . [ 152 ] Other catalyst like Sn-MFI nanosheets was also tested in the B-V reaction. [ 144 ] Owing to the high accessibility of Ti active sites, the Ti-grafted catalyst was effective for alkenes epoxidation using TBHP, but not with H 2 O 2 .…”

Section: Wileyonlinelibrarycommentioning

confidence: 99%

Recent Advances in the Synthesis and Application of Two‐Dimensional Zeolites

Sun

2016

Advanced Energy Materials

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traditional hydrothermal syntheses would produce intermediate materials with 2D feature, such as MCM-22P, [ 7,8 ] PREFER, [ 9 ] which are composed of crystalline zeolite layers with the unit-cell thickness stacking on top of each other in ordered or disordered patterns. [10][11][12][13][14][15] Unlike traditional 3D zeolites, the crystal growth of frameworks in 2D layered zeolites is restricted in one particular direction, leaving lots of hydroxyl groups on layer surface. As zeolites are normally defi ned as 3D materials that possess regular micropore systems and consist of TO 4 tetrahedra, layered zeolite precursors containing silanols could not be regarded as zeolites in the strictest sense, but they are broadly included in the family of zeolite materials. Thus, the as-synthesized 2D zeolites are often denoted as layered zeolite precursors (the typical examples are shown in Table 1 ), [7][8][9] which would transform into their 3D order/disorder counterparts after removing organic molecules and condesation of interlayer silanols via calcination. [ 10 ] In the early research stage, the layered zeolite precursors are discovered accidentally in traditional hydrothermal syntheses, because we have limited control over the traditional synthesis process due to the incomplete understanding of crystallization mechanism. At that stage, one of the most attractive features of 2D zeolites is that they could transform into zeolite materials with hierarchical architectures. In some cases, the traditional synthesis produces hierarchical layered material, such as MCM-56, [ 26 ] in which the crystalline zeolite layers disorderly stacked. Furthermore, the recognition that the obtained layered precursors could be modifi ed into various hierarchical zeolite structures (such as delaminated, pillared, interlayer expanded and others) make them signifi cantly different from conventional 3D zeolite materials with rigid structures. Thus, the construction of hierarchical zeolite materials from the perspective of 2D layered zeolite precursors is an important research aspect during the past few years.With the improved synthetic techniques, layered zeolites are not only increasing in number, but also expanding the notion in composition and structure. One remarkable breakthrough in recent years is the discovery of 2D MFI nanosheets with the single unit-cell thickness (about 2 nm), which is achieved by adopting Gemini-type bifunctional surfactants as organic structure-directing agent (OSDA) in hydrothermal synthesis. [ 49 ] The calcined MFI nanosheets become a special kind of hierarchical zeolites Two-dimensional (2D) zeolites, originating from lamellar precursors, are a special kind of porous materials, in which crystalline zeolite nanolayers are weakly assembled in one particular direction. As there is no covalentbond between layers, the stacking sequences could be manipulated and possibly controlled to derive a family of zeolitic materials with structural diversity. The research on 2D zeolites arises from the primary casual discovery during ...

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Hydrothermal synthesis of MWW-type stannosilicate and its post-structural transformation to MCM-56 analogue

Cited by 40 publications

References 39 publications

Controllably Confined ZnO on USY Zeolites (USY@ZnO/Al₂O₃) as Efficient Lewis Acid Catalysts for Baeyer–Villiger Oxidation

Controllably Confined ZnO on USY Zeolites (USY@ZnO/Al₂O₃) as Efficient Lewis Acid Catalysts for Baeyer–Villiger Oxidation

Pillared Sn‐MWW Prepared by a Solid‐State‐Exchange Method and its Use as a Lewis Acid Catalyst

Recent Advances in the Synthesis and Application of Two‐Dimensional Zeolites

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Hydrothermal synthesis of MWW-type stannosilicate and its post-structural transformation to MCM-56 analogue

Cited by 40 publications

References 39 publications

Controllably Confined ZnO on USY Zeolites (USY@ZnO/Al2O3) as Efficient Lewis Acid Catalysts for Baeyer–Villiger Oxidation

Controllably Confined ZnO on USY Zeolites (USY@ZnO/Al2O3) as Efficient Lewis Acid Catalysts for Baeyer–Villiger Oxidation

Pillared Sn‐MWW Prepared by a Solid‐State‐Exchange Method and its Use as a Lewis Acid Catalyst

Recent Advances in the Synthesis and Application of Two‐Dimensional Zeolites

Contact Info

Product

Resources

About

Controllably Confined ZnO on USY Zeolites (USY@ZnO/Al₂O₃) as Efficient Lewis Acid Catalysts for Baeyer–Villiger Oxidation

Controllably Confined ZnO on USY Zeolites (USY@ZnO/Al₂O₃) as Efficient Lewis Acid Catalysts for Baeyer–Villiger Oxidation