Tuning surfactant-templates of nanorod-like cryptomelane synthesis towards vapor-phase selective oxidation of benzyl alcohol

•Synthesis of nanorod-like cryptomelane using Tergitol and cetyltrimethylammonium bromide (CTAB) as surfactant-templates.•Vapor-phase selective oxidation of benzyl alcohol towards benzaldehyde.•Tergitol and CTAB surfactant-templates: contributions to catalytic activity enhancement.•Industrial proces...

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Bibliographic Details
Published in:Materials letters 2020-10, Vol.277, p.128333, Article 128333
Main Authors: Tran-Thuy, Tuyet-Mai, Nguyen, Linh-Dang, Lam, Hoa-Hung, Nguyen, Dung V., Dang-Bao, Trung
Format: Article
Language:English
Subjects:
Benzaldehyde
Benzyl alcohol
Catalysts
Cetyltrimethylammonium bromide
Chlorine
Cryptomelane
CTAB
Desorption
Gravimetric analysis
Materials science
Morphology
Nanorods
Oxidation
Potassium
Potassium permanganate
Surfactants
Tergitol
Thermal stability
Vapor-phase selective oxidation
X ray powder diffraction
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Summary:•Synthesis of nanorod-like cryptomelane using Tergitol and cetyltrimethylammonium bromide (CTAB) as surfactant-templates.•Vapor-phase selective oxidation of benzyl alcohol towards benzaldehyde.•Tergitol and CTAB surfactant-templates: contributions to catalytic activity enhancement.•Industrial processes to produce chlorine-free benzaldehyde. In this study, nanorod-like cryptomelane was prepared via reduction of potassium permanganate in the presence of Tergitol (S1) and cetyltrimethylammonium bromide (CTAB, S2) as surfactant-templates. X-ray powder diffraction, scanning electron microscopy and N2 adsorption–desorption isotherms indicated the microporous nanorod-like cryptomelane structure. Element analysis revealed 7.5 wt% (S1) and 4.5 wt% (S1) of potassium while thermal gravimetricanalysis and temperature program desorption of oxygen revealed more active oxygen species over S2 catalyst, consisting to a lower H2 consumption over S2 (3.04 mmolH2/g) than that over S1 (3.55 mmolH2/g). Both Tergitol and CTAB surfactant-templates contributed to significant enhancement of their catalytic reactivity in vapor-phase oxidation of benzyl alcohol to benzaldehyde (rPhCHO = 68.6 and 74.6 mmolPhCHO/g.h at 280 °C over S1 and S2 catalysts, respectively). S1 catalyst possesses unique properties such as uniform nano-rod morphology, high thermal stability and considerable rPhCHO at 240–280 °C, adapting the industrial processes to produce chlorine-free benzaldehyde.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2020.128333