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Influence of Titanium Species on the Ordered Mesoporous Structure of V‐Zr Catalysts for Naphthalene Oxidation with Hydrogen Peroxide
Author(s) -
Liu Chuanfa,
Zhou Zhiwei,
Qin Juan,
Li Fanqing,
Yu Chaojie,
Liu Guang,
Huang Hao,
Wu Wenliang
Publication year - 2020
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201904071
Subject(s) - catalysis , titanium , vanadium , naphthalene , mesoporous material , inorganic chemistry , hydrogen peroxide , zirconium , calcination , materials science , selectivity , chemistry , organic chemistry , metallurgy
The characterization of XRD, N 2 sorption, Raman, Py‐IR, O 2 ‐TPD, NH 3 ‐TPD, SEM‐EDX and TEM were utilized to investigate the influence of titanium species on the ordered mesoporous structure of V‐doped titanium and zirconium composite metal oxides (VTZ) catalysts prepared by EISA method. The characterization results showed that the introduction of titanium species would increase the catalyst crystallization temperature resulting in pure t‐ZrO 2 phase formation with uniform distribution for all elements and more oxygen vacancies owing to the inhibition of its crystal transformation, which would be beneficial to the promotion of specific surface area and stronger Brønsted acidity. The catalytic performance in the liquid‐phase oxidation of naphthalene with hydrogen peroxide was also studied. The 12V15TZ‐550 catalyst with the molar ratio of vanadium and titanium species to the total titanium and zirconium species of 12 and 15%, respectively, calcined at 550 °C showed higher catalytic performance than other catalysts, where the naphthalene conversion of 17.3% and the 1,4‐naphthoquinone selectivity of 71.0% can be obtained. The catalytic stability would be kept well after repeated use for 5 times.