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    • 10. 再颁专利
    • Catalyst for use in producing carboxylic esters
    • 用于生产羧酸酯的催化剂
    • USRE38283E1
    • 2003-10-21
    • US10101252
    • 2002-03-20
    • Setsuo YamamatsuTatsuo YamaguchiKoshiro Yokota
    • Setsuo YamamatsuTatsuo YamaguchiKoshiro Yokota
    • C07C6974
    • C07C67/39B01J21/14B01J23/628B01J29/44B01J29/48B01J35/002B01J37/0045C07C69/54
    • 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 and a Pd/Pb atomic ratio (S) of 3/0.7≦S≦ from 3/0.7 to 3/1.3, and which exhibits a maximum intensity peak at a diffraction angle (2&thgr;) in the range of from 38.55° to 38.70° in a power 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 component to a reduction treatment in the presence of lead ions and at least one compound selected from a lower fatty acid, an 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.