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AlPO4-5 molecular sieves substituted with different transition metal ions
have been used as catalysts in synthesis of many important organic compounds.
In this work, phenol and 2,3,5-trimethyl-1.4-benzoquinone were synthesized
when hydrogen peroxide was used as oxidant. Phenol is used as a medicine and
also an important intermediate of many chemicals. It can be obtained from
benzene in the presence of acetonitrile as solvent at relatively low
temperature (333 K), and only Cu-APO-5 molecular sieve was efficient in
catalyzing benzene to phenol. In-situ EXAFS and UV were employed to study
the environment of copper during the reaction. The radical mechanism was
proposed to explain the results. 2,3,5-trimethyl-1.4-benzoquinone is a key
intermediate in the synthesis of vitamin E. Successful oxidation of
2,3,6-trimethylphenol to 2,3,5-trimethyl-1.4-benzoquinone was carried out at
333 K by using acetic acid as solvent and many different metal-substituted
AlPO4-5 molecular sieves could be the catalyst. Effects of different so
lvents and metal species were also discussed in this research. The results
indicated that CuAPO-5 has the highest yield (72%) of 2,3,5-trimethyl-1
.4-benzoquinone, and acetic acid was the best solvent.
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