Hierarchical architectures of ZSM-5 nanocrystalline aggregates with particular catalysis for lager molecule reaction

Wang, Qianqian; Ma, Jinghong; Ren, Fen-fen; Du, Jun; Li, Ruifeng

doi:10.1016/j.micromeso.2016.10.051

Cited by 55 publications

(12 citation statements)

References 31 publications

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“…The ZF zeolite series samples presented typical type IV adsorption isotherms with hysteresis loops (H4 type), while the ZSM-5 zeolite series samples (in Figure 6b) presented typical type I isotherms according to the Brunauer-Deming-Deming-Teller (BDDT) classification [37]. After being acid-etched by HNO 3 , enlarged hysteresis loops (H4 type) at P/P 0 over ZF-D could be obviously observed, which was assigned to capillary condensation owing to the existence of mesopores that were successfully created by the HNO 3 etching [38][39][40]. Sext is the external surface area, determined according to the t-plot method.…”

Section: Pore Size Distribution Analysismentioning

confidence: 98%

Catalytic Performance of Toluene Combustion over Pt Nanoparticles Supported on Pore-Modified Macro-Meso-Microporous Zeolite Foam

Zou

Zhang

et al. 2019

Nanomaterials

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Herein, to investigate the pore effect on toluene catalytic oxidation activity, novel supports for Pt nanoparticles-ZSM-5 foam (ZF) fabricated using polyurethane foam (PUF) templates and pore-modified ZSM-5 foam (ZF-D) treated by acid etching, comparing with conventional ZSM-5 and pore-modified ZSM-5 (ZSM-5-D), were successfully synthesized. Pt nanoparticles were loaded on series ZSM-5 supports by the impregnation method. The Pt loaded on ZF-D (Pt/ZF-D) showed the highest activity of toluene catalytic combustion (i.e., T 90 = 158 • C), with extraordinary stability and an anti-coking ability. Based on various catalysts characterizations, the unique macropores of ZF facilitated the process of acid etching as compared to conventional ZSM-5. The mesopores volume of ZF-D significantly increased due to acid etching, which enlarged toluene adsorption capacity and led to a better Pt distribution since some Pt nanoparticles were immobilized into some mesopores. Specifically, the microporous distribution was centered in the range of 0.7-0.8 nm close to the molecular diameter of toluene (ca. 0.67 nm), which was key to the increasing toluene diffusion rate due to pore levitation effect of catalysts and accessibility of metal. Furthermore, the reducibility of Pt nanoparticles was improved on Pt/ZF-D, which enhanced the activity of toluene catalytic oxidation.

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Section: Pore Size Distribution Analysismentioning

confidence: 98%

Catalytic Performance of Toluene Combustion over Pt Nanoparticles Supported on Pore-Modified Macro-Meso-Microporous Zeolite Foam

Zou

Zhang

et al. 2019

Nanomaterials

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“…To date, the synthetic methods mainly utilize two approaches, such as bottom-up means with templates (porous carbons, cationic polymers or surfactants, etc.) and top-down means for the extraction of alumina or silica [8][9][10][11][12]. As-made micro-meso-large-pore zeolites have some important advantages, such as their hierarchical pore system, their increased number of active sites, as well as their better diffusivity and hydrothermal and thermal stabilities.…”

Section: Introductionmentioning

confidence: 99%

In Situ Recrystallization of Mesoporous Carbon–Silica Composite for the Synthesis of Hierarchically Porous Zeolites

Wang

2020

Materials

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Hierarchically porous ZSM-5 was prepared by utilizing a two-step crystallization procedure with carbon–silica composites as precursors. The hierarchically porous zeolites obtained a regular mesoporous structure with aluminum incorporated into the carbon–silica composite frameworks. The carbon–silica composite zeolites were characterized by XRD, TEM, SEM, and nitrogen adsorption/desorption. As-prepared hierarchical zeolites were used in the 1,3,5-triisopropylbenzene (TIPB) cracking reaction and exhibited significantly high TIPB conversion, while the accessibility factors were also determined.

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“…Tao et al [ 32 ] and Yang et al [ 20 ] reported a space-confined synthesis route of hierarchical MFI and beta zeolite microspheres with nanorod-oriented assembled structures of a carbon–silica composite monolith via hydrothermal treatment. Wang et al [ 40 ] hydrothermally synthesized hierarchical ZSM-5 zeolite microspheres by using organofunctionalized silanized mesoporous silica as silica source. Sashkina et al [ 41 ] reported the synthesis of aerogel/zeolite composite microspheres based on Fe-containing zeolite nanocrystals embedded into silica aerogel matrix using the emulsion/gelation technique.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Binderless ZK-4 Zeolite Microspheres at High Temperature

et al. 2018

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Binderless zeolite macrostructures in the form of ZK-4 microspheres were prepared using anion-exchange resin beads as shape-directing macrotemplates. The particles were synthesized under hydrothermal conditions at different temperatures and treatment times. The influence of the different synthesis parameters was investigated by X-ray diffraction, scanning electron microscopy, fluorescence X, nitrogen adsorption measurements and 29Si solid-state NMR. Fully crystalline spheres similar in size and shape to the original resin beads were obtained by a hydrothermal treatment at the highest temperatures (150–180 °C) for a short treatment time of 24 h. The synthesized microspheres showed to be promising in the molecular decontamination of volatile organic compounds (VOCs).

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Hierarchical architectures of ZSM-5 nanocrystalline aggregates with particular catalysis for lager molecule reaction

Cited by 55 publications

References 31 publications

Catalytic Performance of Toluene Combustion over Pt Nanoparticles Supported on Pore-Modified Macro-Meso-Microporous Zeolite Foam

Catalytic Performance of Toluene Combustion over Pt Nanoparticles Supported on Pore-Modified Macro-Meso-Microporous Zeolite Foam

In Situ Recrystallization of Mesoporous Carbon–Silica Composite for the Synthesis of Hierarchically Porous Zeolites

Synthesis of Binderless ZK-4 Zeolite Microspheres at High Temperature

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