Methods of removing halogen from non-zeolitic molecular sieve catalysts
AssigneeExxonMobil Chemical Patents Inc.
InventorsLuc R. Martens, Stephen N. Vaughn, Albert E. Schweizer, John K. Pierce
Life of this patent
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Abstract
Methods of calcining non-zeolitic molecular sieve catalyst to remove most, if not nearly all, of halogen contained in the catalyst. One method includes heating the catalyst in a low moisture environment, followed by contacting the heated catalyst with air and/or steam. Another method includes steam-treating the catalyst at a temperature from 400° C. to 1000° C. The calcination methods provides a catalyst that contains from about 10 ppmw to about 600 ppmw chlorine, preferably 10 ppmw to about 200 ppmw chlorine, more preferably 10 ppmw to about 80 ppmw chlorine.
Claims57
A method of removing halogen from a non-zeolitic molecular sieve catalyst comprising:
- heating the catalyst in a low moisture environment at a temperature from 400° C. to 1000°;
- and
- contacting the heated catalyst with steam at a temperature from 400° C. to 1000° C. to produce a steam-treated catalyst.
A method of removing halogen from a non zeolitic molecular sieve catalyst comprising:
- heating the catalyst in an oxygen environment at a temperature from 400° C. to 1000° C. to produce a heated catalyst;
- and
- contacting the heated catalyst with steam at a temperature from 400° C. to 1000° C.
A method of removing halogen from a halogen-containing non zeolitic molecular sieve catalyst, the method comprising heating the catalyst in an environment containing steam at a temperature from 400° C. to 1000° C., removing from 70% to 99.99% by weight of the halogen from the catalyst, thereby producing a steam-treated catalyst.
A method of removing chlorine from a non-zeolitic molecular sieve catalyst comprising:
- heating the catalyst in a low moisture environment at a temperature from 400° C. to 1000° C. to remove at least 50% by weight of the chlorine from the catalyst;
- and
- contacting the heated catalyst in a second calcination environment containing about 5% to about 10% by volume water at a temperature from 400° C. to 1000° C.
A catalyst comprising a non zeolitic molecular sieve, inorganic oxide matrix, and matrix material, wherein the catalyst contains from 10 ppm to 600 ppm by weight halogen.
Dependencies are inferred from the claim text.