| 摘要 |
DISCLOSED IS A NOVEL CATALYST FOR USE IN PRODUCING A CARBOXYLIC ESTER FROM AN ALDEHYDE, AN ALCOHOL AND MOLECULAR OXYGEN, WHICH COMPRISES A CARRIER HAVING SUPPORTED THEREON PD AND PB IN A PD/PB ATOMIC RATIO (S) OF 3/0.7< S< 3/1.3, AND WHICH EXHIBITS A MAXIMUM INTENSITY PEAK AT A DIFFRACTION ANGLE (2THETA) IN THE RANGE OF FROM 38.55° TO 38.70° IN A POWDER X-RAY DIFFRACTION PATTERN THEREOF, WHEREIN THE PEAK IS ASCRIBED TO THE (111) CRYSTAL FACE DIFFRACTION OF A PD-PB INTERMETALLIC COMPOUND. THE CATALYST CAN BE EFFICIENTLY PRODUCED BY SUBJECTING A CATALYST PRECURSOR COMPRISING A CARRIER HAVING SUPPORTED THEREON A REDUCIBLE PD COMPOUND OR A MIXTURE OF A REDUCIBLE PD COMPOUND AND A REDUCIBLE PB COMPOUND TO A REDUCTION TREATMENT IN THE PRESENCE OF LEAD INOS AND AT LEAST ONE COMPOUND SELECTED FROM A LOWER FATTY ACID, AND ALKALI METAL SALT AND AN ALKALINE EARTH METAL SALT, OR BY SUBJECTING A CATALYST PREPARED BY A CONVENTIONAL METHOD, WHICH COMPRISES A CARRIER HAVING SUPPORTED THEREON PD OR A MIXTURE OF PD AND PB, TO AN ACTIVATION TREATMENT. BY USING THE CATALYST, THE DESIRED CARBOXYLIC ESTER CAN BE PRODUCED WITH HIGH SELECTIVITY, WHILE SUPPRESSING THE FORMATION OF BY-PRODUCTS, EVEN UNDER HIGH TEMPERATURE AND HIGH ALDEHYDE CONCENTRATION CONDITIONS. FURTHER, IN THE CONTINUOUS PRODUCTION OF A CARBOXYLIC ESTER USING THE CATALYST, STABILIZATION OF THE CATALYST CAN BE EFFECTIVELY PERFORMED, SO THAT A DESIRED CARBOXYLIC ESTER CAN BE STABLY PRODUCED WITH HIGH EFFICIENCY AND IN HIGH YIELD FOR A PROLONGED PERIOD OF TIME.
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