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本工作合成了四种不同N/Pd摩尔比的聚γ-氨丙基硅氧烷钯、钼双金属催化剂,它们的加氢活性与相应的钯、钼单金属催化剂的混合物相比差别不大,但是,由于钼的加入,提高了单金属钯催化剂的加氢活性。XPS分析表明,有一部分N与PdCl_2及MoCl_x发生络合,而且Pd-Cl键和Mo—Cl键依然存在,催化剂中Pd的价态为正2价,Mo的价态为正5或6价。
In this work, four kinds of poly-γ-aminopropylsiloxane palladium and molybdenum bimetallic catalysts with different N / Pd molar ratios were synthesized. Their hydrogenation activities were not significantly different from the corresponding mixtures of the corresponding palladium and molybdenum single metal catalysts However, due to the addition of molybdenum, the hydrogenation activity of the monometallic palladium catalyst is increased. XPS analysis showed that a part of N complexed with PdCl_2 and MoCl_x, and the Pd-Cl bond and Mo-Cl bond still existed. The valence state of Pd in the catalyst was positive 2-valence and that of Mo was 5 or 6 valence.