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Amorphous Porous Chromium‐Zirconium Bimetallic Phosphate: Synthesis, Characterization and Application in Liquid Phase Oxidation of Hydrocarbons by Different Oxygen Sources
Author(s) -
Sun Lei,
Kong Deyu,
Wang Fang,
Luo Wei,
Chen Yanqiu,
Liu Junhua
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.201904073
Subject(s) - bimetallic strip , catalysis , zirconium , zirconium phosphate , inorganic chemistry , mesoporous material , redox , chemistry , chromium , cyclohexane , cyclohexene , phosphate , materials science , nuclear chemistry , organic chemistry
Cr−Zr bimetallic phosphates catalysts were prepared by sol‐gel method and used in the oxidation of cyclohexane, ethylbenzene and cyclohexene, respectively. The catalysts were characterized by a variety of analytical techniques. The results show that chromium ions enter the framework of mesoporous zirconium phosphate, Cr−Zr phosphates catalysts with molar ratio of Cr: Zr=2 (CrZr 2 P) or Cr: Zr=1 (CrZrP) still retain the mesoporous structure and form composite metal phosphates. Two active centers‐ redox (Cr 6+ ) and acidic sites in these bimetallic phosphates play a synergistic catalytic role in the oxidation of C−H bond. Catalytic activity is closely related to the amount of acid or acid strength, the C=O product selectivity depends on the amount and high dispersion of Cr 6+ species. Acidic sites and redox sites are affected by different molar ratios of chromium/ zirconium. Among the Cr−Zr phosphates catalysts, CrZr 2 P and CrZrP catalysts show excellent activity, just because the formation of mesoporous structure leads to the uniform dispersion of acidic and redox sites.