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    • 3. 发明公开
    • CATALYST FOR THE PREPARATION OF CARBOXYLIC ESTERS
    • KATALYSATOR ZUR HERSTELLUNG VONCARBONSÄUREESTERN
    • EP0857512A1
    • 1998-08-12
    • EP96924148.8
    • 1996-07-18
    • Asahi Kasei Kogyo Kabushiki Kaisha
    • YAMAMATSU, SetsuoYAMAGUCHI, TatsuoYOKOTA, Koshiro,
    • B01J23/62C07C69/54C07C67/08C07C67/39
    • 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 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 (2θ) 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 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.
    • 公开了一种用于从醛,醇和分子氧生产羧酸酯的新型催化剂,其包含载体,Pd / Pb原子比(S)为3 / 0.7S 在其粉末X射线衍射图中在衍射角(2θ)处显示最大强度峰值在38.55℃至38.70℃的范围内,其中峰值归因于( 111)Pd-Pb金属间化合物的晶面衍射。 催化剂可以通过使负载有载体的催化剂前体与可还原的Pd化合物或可还原的Pd化合物和可还原的Pb化合物的混合物在铅离子和至少一种选择的化合物的存在下进行还原处理来有效地制备 或者通过将包含负载有Pd或Pd和Pb的混合物的载体的常规方法制备的催化剂进行活化处理。 通过使用催化剂,即使在高温和高浓度的醛浓度的条件下,也可以高选择性地制造所需的羧酸酯,同时抑制副产物的形成。 此外,在使用该催化剂的羧酸酯的连续制造中,可以有效地进行催化剂的稳定化,从而能够以高效率,高产率,长时间稳定地制造所需的羧酸酯。