A fast route for synthesizing nano-sized ZSM-5 aggregates

Pan, Feng; Lu, Xuchen; Zhu, Qingshan; Zhang, Zhimin; Yan, Yan; Wang, Tizhuang; Chen, Shiwei

doi:10.1039/c4ta04073b

Cited by 62 publications

(25 citation statements)

References 43 publications

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“…The preparation of small nanoparticles has attracted more and more researchers' attention during recent decades. Nanocrystalline zeolites have better diffusion properties than bulk zeolites because of their shorter channels , . However, this route needs to be carried out at low temperature with very low yield, which is recognized as an uneconomic process for catalyst preparation.…”

Section: Introductionmentioning

confidence: 99%

“…Nanocrystalline zeolites have better diffusion properties than bulk zeolites because of their shorter channels. 8,9 However, this route needs to be carried out at low temperature with very low yield, which is recognized as an uneconomic process for catalyst preparation. The synthesis of zeolites with hollow morphology shows that diffusion limitations in catalytic reaction can be alleviated by the thin microporous walls.…”

Section: Introductionmentioning

confidence: 99%

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Gemini‐type cationic surfactant‐directed synthesis of hollow ZSM‐5 zeolite with intracrystalline mesopores and its application in the hydroxylation of phenol

Shen

Wang

Han

et al. 2017

J of Chemical Tech & Biotech

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BACKGROUND ZSM‐5 zeolites are of great importance in industrial catalysis. However, the diffusion limitations caused by small pore opening restrict the extent of catalytic conversions over conventional ZSM‐5. Many studies have shown that mass transfer in zeolite channels can be improved by controlling the morphology or creating additional mesoporosity. Here, the catalytic performance is further improved by the creation of hollow structure and intracrystalline mesopores in ZSM‐5 zeolite. RESULTS The characterization results demonstrated that hollow ZSM‐5 with intracrystalline mesopores can be synthesized by using a simple one‐step hydrothermal strategy with a commercial gemini‐type cationic surfactant containing hydrophilic hydroxyl groups. Compared with the Fe‐substituted conventional ZSM‐5, the Fe‐substituted hollow ZSM‐5 with intracrystalline mesopores show remarkably enhanced catalytic performance in the hydroxylation of phenol. About 52.2% conversion of phenol can be obtained with almost 96.8% selectivity to dihydroxybenzenes. The catalytic activity remained almost unchanged after five cycles. CONCLUSION The newly created hollow structure and intracrystalline mesopores in ZSM‐5 zeolite showed enhanced catalytic activity and reusability for the hydroxylation of phenol, which is higher than most reported systems. The prepared catalyst is a promising alternative material for the hydroxylation of phenol. © 2017 Society of Chemical Industry

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Gemini‐type cationic surfactant‐directed synthesis of hollow ZSM‐5 zeolite with intracrystalline mesopores and its application in the hydroxylation of phenol

Shen

Wang

Han

et al. 2017

J of Chemical Tech & Biotech

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“…The XRD pattern shown in Figure 1d is typical for highly crystalline ZSM-5. 18,31,32 For a comparison, see the XRD pattern of 6-ZSM-5 (synthesized without iron oxide NPs from the same silica precursor) in Figure S1 (ESI). For magnetite, only the strongest reflections (311), (511), and (440) are visible, while the other reflections are too weak to be detectable.…”

Section: Structure Of Fe3o4-containing Zsm-5mentioning

confidence: 99%

“…Moreover, dramatic changes in the product distribution (a much higher fraction of C1-C4 hydrocarbons after four consecutive reaction/regeneration cycles) reveal that the microporous network is filled with coke while there is no coke in the close vicinity of Fe3O4 NPs. There are several avenues to minimize coke formation including decreasing the size of zeolite particles, 18,19 creating hierarchical porosity, [8][9][10][11][12][13] etc. However, the Fe3O4-ZSM-5 catalysts already display hierarchical porosity and comparatively small particle size (see Figure S6, ESI and the discussion below).…”

Section: Catalytic Properties In the Mth Process: The Fe3o4 Influencementioning

confidence: 99%

“…7 In recent years several new avenues were developed to prevent coke formation and/or increase the catalyst activity. These avenues include the development of hierarchical zeolites, i.e., zeolites containing both micro-and mesopores, [8][9][10][11][12][13][14][15][16] minimizing internal framework defects in the zeolite structure, 17 formation of nanosized ZSM particles, 18,19 etc. The other approach to improve catalyst stability of ZSM-5 is its modification with various metals.…”

Section: Introductionmentioning

confidence: 99%

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Metal oxide–zeolite composites in transformation of methanol to hydrocarbons: do iron oxide and nickel oxide matter?

et al. 2016

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(2016) Metal oxide-zeolite composites in transformation of methanol to hydrocarbons : do iron oxide and nickel oxide matter? RSC Advances, 6 (79). pp. 75166-75177. Permanent WRAP URL:http://wrap.warwick.ac.uk/81920 Copyright and reuse:The Warwick Research Archive Portal (WRAP) makes this work of researchers of the University of Warwick available open access under the following conditions. Copyright © and all moral rights to the version of the paper presented here belong to the individual author(s) and/or other copyright owners. To the extent reasonable and practicable the material made available in WRAP has been checked for eligibility before being made available.Copies of full items can be used for personal research or study, educational, or not-for-profit purposes without prior permission or charge. Provided that the authors, title and full bibliographic details are credited, a hyperlink and/or URL is given for the original metadata page and the content is not changed in any way. Publisher statement:First published by Royal Society of Chemistry 2016 http://dx.doi.org/10.1039/C6RA19471K A note on versions:The version presented here may differ from the published version or, version of record, if you wish to cite this item you are advised to consult the publisher's version. Please see the 'permanent WRAP url' above for details on accessing the published version and note that access may require a subscription. ABSTRACT: The methanol-to-hydrocarbon (MTH) reaction received considerable attention as utilizing renewable sources of both value-added chemicals and fuels becomes number one priority for the society. Here, for the first time we report the development of hierarchical zeolites (ZSM-5) containing both iron oxide and nickel oxide nanoparticles. Modifying the iron oxide (magnetite, Fe3O4) amounts, we are able to control the catalyst activity and the product distribution in the MTH process. At the medium Fe3O4 loading, the major fraction is composed of the C9-C11 hydrocarbons (gasoline fraction). At the higher Fe3O4 loading, the C1-C4 hydrocarbons prevail in the reaction mixture, while at the lowest magnetite loading the major component is the C5-C8 hydrocarbons. Addition of Ni species to Fe3O4-ZSM-5 leads to the formation of mixed Ni oxides (NiO/Ni2O3) positioned either on top or next to Fe3O4 nanoparticles. This modification allowed us to significantly improve the catalyst stability due to diminishing coke formation and disordering of the coke formed. The incorporation of Ni oxide species also leads to a higher catalyst activity (up to 9.3 g(Methanol)/(g(ZSM-5)×h) and an improved selectivity (11.3% of the C5-C8 hydrocarbons and 23.6% of the C9-C11 hydrocarbons), making these zeolites highly promising for industrial applications.

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Alkylation of Toluene to Mono‐benzylated Toluene over Micro‐mesoporous Zeolite: Effect of Post‐synthetic Treatment and Catalytic Application

Koshti,

Bandyopadhyay,

Kumar

et al. 2023

Eur J Inorg Chem

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Post‐synthetic modification using acid (HNO3) and base (NaOH) are utilised to synthesize hierarchical micro‐mesoporous zeolites with different pore structure. To investigate structural change in materials, X‐ray diffraction (XRD), Scanning electron microscope (SEM), Inductive coupled plasma‐optical emission spectrometry (ICP‐OES), 29Si and 27Al MAS NMR, and N2 adsorption‐desorption isotherms techniques were employed. Acid base titration, and ammonia‐temperature programmed desorption (NH3‐TPD) was performed to evaluate acidic characteristics of materials. As revealed by characterisation, the structure was well preserved after the modification. Hierarchical materials along with parent materials have been evaluated in the toluene alkylation with benzyl alcohol producing mono‐benzylated toluene. All zeolite samples were proved to be catalytically active by their result in the alkylation reaction. Acid treated samples were compared with base treated and parent samples. The results indicate that, base modification significantly increases the mesoporous pore volume in all zeolite as compared to acid modification. Moreover, the highest benzyl alcohol conversion was found to be 98 % in the base modified Beta, with the highest mono‐benzylated toluene selectivity (69 %). Reaction optimization was also studied by altering reaction duration, temperature, and catalyst amount. The reaction products were analysed using Gas Chromatography (GC) and confirmed using Gas chromatography mass spectrometry (GC‐MS).

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A fast route for synthesizing nano-sized ZSM-5 aggregates

Cited by 62 publications

References 43 publications

Gemini‐type cationic surfactant‐directed synthesis of hollow ZSM‐5 zeolite with intracrystalline mesopores and its application in the hydroxylation of phenol

Gemini‐type cationic surfactant‐directed synthesis of hollow ZSM‐5 zeolite with intracrystalline mesopores and its application in the hydroxylation of phenol

Metal oxide–zeolite composites in transformation of methanol to hydrocarbons: do iron oxide and nickel oxide matter?

Alkylation of Toluene to Mono‐benzylated Toluene over Micro‐mesoporous Zeolite: Effect of Post‐synthetic Treatment and Catalytic Application

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