Facile synthesis of nano-sized hollow ZSM-5 zeolites with rich mesopores in shell

Fu, Tingjun; Qi, Ruiyue; Wang, Xia; Wan, Weili; Li, Zhong

doi:10.1016/j.micromeso.2017.05.021

Cited by 34 publications

(23 citation statements)

References 15 publications

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“…Figure 2 shows the powder XRD patterns of the as-synthesized S-1, hS-1, hZSM-5, and cZSM-5 zeolites. All the samples exhibited the five typical characteristic diffraction peaks at 7.98°, 8.84°, 23.12°, 23.95°, and 24.36°, indicative of the MFI-type zeolites [44]. This meant that the bulk crystal structures of hS-1 and hZSM-5 zeolites were maintained after dissolution-recrystallization process.…”

Section: Resultsmentioning

confidence: 99%

“…Unfortunately, the diffusion of reactants and products is usually limited by the microporous structure of zeolite, which decreases the catalytic activity and stability of catalyst. Fabricating intra-crystalline mesoporosity or macroporosity and/or decreasing the size of zeolite crystals are effective methods to overcome the mass transfer limitation and to boost catalyst stability [44,45,46]. Hunns et al have investigated hierarchical mesoporous ZSM-5 supported Pd for HDO of m -cresol and found that the hierarchical porous structure enhanced the dispersion of metallic Pd, and significantly improved m -cresol conversion [39].…”

Section: Introductionmentioning

confidence: 99%

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Hollow MFI Zeolite Supported Pt Catalysts for Highly Selective and Stable Hydrodeoxygenation of Guaiacol to Cycloalkanes

et al. 2019

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Hollow Silicalite-1 and ZSM-5 zeolites with hierarchical porous shells have been synthesized by using a dissolution-recrystallization method. The morphology, structure, and acidity of these zeolites supported Pt catalysts were characterized by XRD, FT-IR, MAS-SSNMR, FE-SEM, FE-TEM, N2-BET, XPS, NH3-TPD, and CO pulse chemisorption. Compared to the conventional ZSM-5 supported Pt catalyst, the special structure in hollow ZSM-5 zeolite significantly promotes the dispersion of metallic Pt and the synergistic effect between metal active sites and acid sites. These boost the catalytic activity, selectivity of guaiacol hydrodeoxygenation toward cycloalkanes and long-term stability over the Pt/hollow ZSM-5 catalyst combined with improved mass transfer of products and reactants derived from the hierarchical hollow porous structure. Moreover, the Pt/hollow ZSM-5 catalyst exhibits excellent low temperature catalytic activity to completely transform guaiacol into cycloalkanes with the cyclohexane selectivity of more than 93% at 220 °C, suggesting that hollow ZSM-5 zeolite is a promising support for upgrading of bio-oils.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hollow MFI Zeolite Supported Pt Catalysts for Highly Selective and Stable Hydrodeoxygenation of Guaiacol to Cycloalkanes

et al. 2019

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“…The obtained catalyst showed improvements regarding its service time in the MTH reaction. [ 78,79 ] Similarly, Xu et al. reported hollow ZSM‐5 with a mesoporous shell using NaOH/TPAOH.…”

Section: Synthesis Of Hierarchical 10‐mr Zeolitesmentioning

confidence: 99%

State of the Art and Perspectives of Hierarchical Zeolites: Practical Overview of Synthesis Methods and Use in Catalysis

et al. 2020

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Zeolites are highly crystalline aluminosilicates with welldefined pores that are constructed of SiO 2 and AlO 4 tetrahedra. These tetrahedra can be linked together in different unique ways to form various materials with a specific topology. [1] According to the International Zeolite Association (IZA), more than 250 different topologies, which are all assigned with a three-letter code, have been identified. [2] The micropores in zeolites are typically constructed from 8, 10, or 12 tetrahedral atoms

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“…Nowadays, this route is primarily used for the creation of hollow structures in MFI‐type zeolites in the presence of tetrapropylammonium hydroxide (TPAOH) since TPAOH is not only the OSDA for MFI‐type zeolites, but it is also an effective agent in protecting the zeolite surface during recrystallization. Due to the Al‐zoning within zeolite crystals, the hollow configuration in ZSM‐5 can be achieved in the absence of TPAOH under mild conditions ,. This method may not be amenable for fabricating hollow structures of other types of zeolites.…”

Section: Perspective and Outlookmentioning

confidence: 99%

Understanding Commonalities and Interplay Between Organotemplate‐Free Zeolite Synthesis, Hierarchical Structure Creation, and Interzeolite Transformation

2018

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are crystalline microporous materials that have been widely used in many applications related to industrial catalysis, ion-exchange, and adsorption. In recent years, there has been a growing emphasis on the development of green chemistry toward more sustainable zeolite synthesis routes. Considerable efforts have been devoted to identifying alternative approaches in order to reduce the negative impacts of organic templates. This review will focus on the significant progress achieved during the past decade on the development of novel organotemplate-free strategies through three distinctive topics, i. e. zeolite synthesis, hierarchical zeolite synthesis, and interzeolite transformation. The progress of each topic will be documented, followed by a summary of the intriguing commonalities and interplay among these approaches. The insights into the mechanism and interplay leading to different zeolite materials will enable us to understand the requirements for designing novel zeolite catalysts and catalyst supports in an organotemplate-free environment that are likely to further enhance the industrial impact of these materials in the future. We conclude this article with a perspective and outlook focusing on current trends and future directions in this area.[a] Dr.

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Facile synthesis of nano-sized hollow ZSM-5 zeolites with rich mesopores in shell

Cited by 34 publications

References 15 publications

Hollow MFI Zeolite Supported Pt Catalysts for Highly Selective and Stable Hydrodeoxygenation of Guaiacol to Cycloalkanes

Hollow MFI Zeolite Supported Pt Catalysts for Highly Selective and Stable Hydrodeoxygenation of Guaiacol to Cycloalkanes

State of the Art and Perspectives of Hierarchical Zeolites: Practical Overview of Synthesis Methods and Use in Catalysis

Understanding Commonalities and Interplay Between Organotemplate‐Free Zeolite Synthesis, Hierarchical Structure Creation, and Interzeolite Transformation

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