Benzene hydroxylation catalyst stability by acid treatment
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United States of America Patent
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Feb 23, 1999
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N/A
app pub date -
Aug 20, 1996
filing date -
Aug 20, 1996
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Expired
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Abstract
A zeolite catalyst for hydroxylating benzene to phenol is treated hydrothermally with a gas comprising approximately 1-100 mole percent water at a temperature between approximately 350.degree.-950.degree. C., and subsequently is treated with an acid. This treatment selectively removes aluminum species from the zeolite catalyst in a manner that increases catalyst stability in phenol production without reducing the activity of the catalyst.
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