The stability of nanosized HZSM-5 zeolite: a high-resolution solid-state NMR study

Zhang, Weiping; Han, Xiuwen; Liu, Xiumei; Bao, Xinhe

doi:10.1016/s1387-1811(01)00428-0

Cited by 37 publications

(29 citation statements)

References 23 publications

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“…The results of 31 P MAS NMR quantitative study show that after hydrothermal treatment the amount of Brönsted acid sites on both the microsized and nanosized HZSM-5 decreased, which is consistent with our previous 1 H MAS NMR study [18], i.e. the peak intensity of Brönsted sites at 3.9 ppm in their corresponding 1 H MAS NMR spectra also decreased.…”

Section: Discussionsupporting

confidence: 91%

“…This is due to the condensation of nonframework aluminum hydroxyls to polymeric aluminum species [30,31]. As demonstrated in our previous 1 H MAS NMR study [18], the peak intensity of nonframework AlOH at 2.7 ppm decreased clearly after hydrothermal treatment, which also supports above explanation. Thus, only a part of nonframework aluminum forms the Lewis acid sites after dealumination.…”

Section: Discussionsupporting

confidence: 87%

“…They were obtained by deammonium at 500 • C for 5 h and denoted as micro-HZ and nano-HZ, respectively. Dealumination by steaming at 400, 500, 700 • C were described in detail in our preceding study [18].…”

Section: Sample Preparationmentioning

confidence: 99%

“…There are two main peaks as expected. One at 52 ppm is typically assigned to the tetrahedral framework Al, and the other at 0 ppm is attributed to octahedral nonframework Al [18][19][20]. In addition, a broad signal centered at ca.…”

Section: P Mas Nmrmentioning

confidence: 99%

“…However, the acidity of dealuminated HZSM-5 zeolite has not been well investigated using TMP as the probe molecule in the literature. In our previous papers, we studied the microporous structure [17] and stability [18] of nanosized HZSM-5 zeolite. Here, we focus on the acidity variations of hydrothermally dealuminated HZSM-5 zeolite with crystal sizes down to the nanoscale by 31 P MAS NMR of adsorbed TMP.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Characterization of the acid sites in dealuminated nanosized HZSM-5 zeolite with the probe molecule trimethylphosphine

Zhang

Han

Liu

et al. 2003

Journal of Molecular Catalysis A: Chemical

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Section: Discussionsupporting

confidence: 91%

Section: Discussionsupporting

confidence: 87%

Section: Sample Preparationmentioning

confidence: 99%

Section: P Mas Nmrmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Characterization of the acid sites in dealuminated nanosized HZSM-5 zeolite with the probe molecule trimethylphosphine

Zhang

Han

Liu

et al. 2003

Journal of Molecular Catalysis A: Chemical

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Experimental Study on Energy Dissipation Characteristics of ZSM‐5 Zeolite/Water System

Sun

et al. 2013

Adv Eng Mater

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Research and development of new materials with high energy dissipation density is one of the key approaches to promote the automotive crash safety. [1,2] Conventional energy dissipation materials and structures based on metal plastic deformation, [3] buckling of cellular truss or foam, [4] damping of polymers, [5] internal friction of textile composites, [6] and phase transformation [7] are employed to achieve the energy desired dissipation goal. Most materials developed so far, however, have relatively low energy dissipation performance in terms of the unit mass/volume consideration, and most of them are not reusable. Therefore, reusable, high-density energy dissipation material candidates are in pressing need for industries.Nanomaterial is considered and proven to be a promising alternative to these traditional materials, [8][9][10][11] among which an innovative nanoporous material energy absorption system (NEAS) was recently established [12] where a nanoporous material and liquid are combined with controllable wetting properties. In essence, NEAS takes advantage of the ultralarge surface area of nanoporous material and during the liquid infiltration process, it converts the external mechanical energy into the excessive solid-liquid interfacial energy and frictional heat. The wetting characteristic, which dominates the infiltration/defiltration and flow behaviors of liquid molecules, can be adjusted via various approaches, including COMMUNICATIONInteraction with liquids at the ultra-large surface area of nanoporous material enables a high-efficiency energy dissipation system with wide perspective applications [A. Han, et al., Langmuir 2008, 24, 7044]. In this paper, a nanoporous energy dissipation system composed of a mixture of zeolite ZSM-5 and water is established and studied experimentally. Firstly, quasi-static compression experiments are carried out to analyze the pressure-volume curve and reveal the energy dissipation mechanism. Afterwards, a parametric study is conducted to explore the effects of three parameters, the pretreatment temperature of zeolite ZSM-5 (600-1100 8C), mass ratio of ZSM-5 to water (1:5-6:5), and average zeolite particle size (2.145-5.251 mm before heated or 6.104-9.557 mm after heated). Results show that in order to obtain optimum energy absorption performance, the pretreatment temperature of about 1000 8C, and higher ratio of ZSM-5 with larger particle size are desired. With high energy dissipation and reusability, the zeolite-water system with optimal parameters established herein may become an attractive cushioning device. 740 wileyonlinelibrary.com ß

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Synthesis of Hierarchical ZSM‐5 Submicron Spheres for Catalytic Cracking

et al. 2022

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A kind of hierarchical ZSM‐5 submicron sphere composed of zeolite nanocrystals was one‐pot synthesized with polydiene dimethyl ammonium chloride as template. X‐ray diffraction (XRD) patterns and scanning electron microscopy (SEM) images show that the hierarchical ZSM‐5 submicron spheres have good crystallinity. N2 adsorption‐desorption isotherm and transmission electron microscopy (TEM) images indicate that the hierarchical ZSM‐5 submicron spheres have both micropores and mesopores. The results show that the hierarchical ZSM‐5 submicron spheres are formed by stacking nanocrystals, exhibits high crystallinity, microporous, mesoporous structures and higher catalytic activity in the catalytic cracking of 1, 3, 5‐triisopropylbenzene.

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The stability of nanosized HZSM-5 zeolite: a high-resolution solid-state NMR study

Cited by 37 publications

References 23 publications

Characterization of the acid sites in dealuminated nanosized HZSM-5 zeolite with the probe molecule trimethylphosphine

Characterization of the acid sites in dealuminated nanosized HZSM-5 zeolite with the probe molecule trimethylphosphine

Experimental Study on Energy Dissipation Characteristics of ZSM‐5 Zeolite/Water System

Synthesis of Hierarchical ZSM‐5 Submicron Spheres for Catalytic Cracking

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