| 摘要 |
FERRIERITE IS ION EXCHANGED WITH TRIVALENT RARE EARTH METALS BY A HYDROTHERMAL ION EXCHANGE METHOD. THE ION EXCHANGE IS CARRIED OUT BY CONTACTING FERRIERITE, IN WHICH ITS CATION EXCHANGE_POSITIONS ARE OCCUPIED BY HYDROGEN OR A HYDROGEN PRECURSOR, WITH AN AQUEOUS SOLUTION OF ONE OR MORE RARE EARTH METAL CATIONS AT A TEMPERATURE ABOVE THE BOILING POINT OF THE SOLUTION. AFTER THE ION EXCHANGE, PREFERABLY AT LEAST 10 % AND MORE PREFERABLY AT LEAST 15 % OF THE FERRIERITE CATION_EXCHANGE CAPACITY IS OCCUPIED BY A TRIVALENT RARE EARTH METAL CATION. WHEN COMBINED WITH A CATALYTIC METAL, SUCH AS A GROUP VIII NOBLE METAL, THE TRIVALENT RARE EARTH METAL ION EXCHANGED FERRIERITE IS USEFUL AS A DEWAXING CATALYST HAVING GOOD SELECTIVITY FOR LUBRICATING OIL FRACTIONS, PARTICULARLY WHEN DEWAXING A FISCHER-TROPSCH WAX HYDROISOMERATE.
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