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Structural, morphological and catalytic investigations on hierarchical ZSM-5 zeolite hexagonal cubes by surfactant assisted hydrothermal method
Subramanian Sivasanker, Narayanan S, Vijaya J.J, Sivasanker S, Jesudoss S.K., John Kennedy L
Published in Elsevier
2015
Volume: 274
   
Pages: 338 - 348
Abstract
Nanosized ZSM-5 zeolite hexagonal cubic micro-blocks with different Si/Al ratios were successfully synthesized by using TPAOH in the presence of nonionic surfactant (Triton X-100) by a hydrothermal method. The samples prepared with the surfactant were characterized by XRD, XRF, FT-IR, N2 adsorption, HR-TEM, HR-SEM and NH3-TPD analysis to evaluate the particle structure, size and acid strength. Pure crystalline phase of ZSM-5 is confirmed by powder X-ray diffraction. FT-IR analysis further showed that nanosized zeolite has double five rings of the MFI-type of typical absorption at about 550cm-1. The SEM images clearly show that all ZSM-5 zeolite samples possess the similar hexagonal spheres morphology with particle size of about 320-360nm. The influence of Triton X-100 in the structural, textural, morphological and catalytic properties of ZSM-5 is compared with conventional ZSM-5. The catalytic activity of ZSM-5 zeolites with different Si/Al ratios (ZSM-5-WS(x) and ZSM-5-WOS(x)) is evaluated in the selective oxidation of benzyl alcohol (BzOH) using tert-butyl hydroperoxide (TBHP) as an oxidant and water as a solvent. The Triton X-100-assisted preparation yielded a zeolite exhibiting a higher conversion than the one prepared in the absence of Triton X-100. Among the catalysts, ZSM-5-WS(28) (Si/Al=28) catalyst exhibited significantly higher conversion at optimum conditions. This catalyst can be retrieved and reprocessed for five times without a significant loss in its activity and selectivity. © 2015.Published by Elsevier B.V.
About the journal
JournalData powered by TypesetPowder Technology
PublisherData powered by TypesetElsevier
ISSN00325910
Open AccessNo
Concepts (52)
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    Catalysis
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    Catalyst selectivity
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    CATALYSTS
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    Catalytic oxidation
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    Hydrothermal synthesis
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    Nonionic surfactants
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    Particle size
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    Particle size analysis
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    Silicon
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    Surface active agents
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    X ray diffraction
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    Zeolites
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    DIFFERENT SI/AL RATIO
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    HIERARCHICAL ZSM-5 ZEOLITES
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    NANO-SIZED ZSM-5 ZEOLITES
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    Powder x ray diffraction
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    Selective oxidation
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    Surfactant assisted
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    TERT-BUTYLHYDROPEROXIDE
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    ZSM-5 ZEOLITES
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    Catalyst activity
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    Aluminum
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    Ammonia
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    Benzyl alcohol
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    Nanoparticle
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    NONIONIC SURFACTANT
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    Organic solvent
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    Oxidizing agent
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    Tert butyl hydroperoxide
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    TETRAPROPYLAMMONIUM
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    Triton x 100
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    Unclassified drug
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    Water
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    Zeolite
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    ZSM 5
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    Absorption
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    Adsorption kinetics
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    Analytic method
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    Article
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    Desorption
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    Hydrothermal method
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    Infrared spectroscopy
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    NANOCATALYSIS
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    Nanocatalyst
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    Oxidation
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    Quantum yield
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    Scanning electron microscopy
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    Structure analysis
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    Synthesis
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    Temperature
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    Transmission electron microscopy
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    X ray fluorescence