聚γ-氨丙基硅氧烷钯、钼双金属催化剂的合成、加氢活性及其XPS研究

HYDROGENATION ACTIVITY AND XPS STUDY OF POLY-r-AMINOPROPYL S1LOXANE SUPPORTED PALLADIUM- MOLYBDENUM BIMETALLIC COMPLEXES CATALYST

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。

This paper is concerned with synthesis of the title complex and study on its hydrogena-tion activity for olefins and nitrobenzene. Comparison with the activity of the palladium-nitrogen complex, the mixture of the later and the bound molybdenum complex was made.The data indicated that the catalytic activity of the title complex was higher than that of the monometallic analogue, however, the corresponding rates in both cases the bimetallic complex and mixture catalysts are similar to each other. From the result of XPS analysis we can see that complex between some N and PdCl2 or MoClx takes place, however, the bond of Pd-Cl or Mo-Cl remains, the valences of Pd and Mo are 2 and 5 (or 6) in catalysts respectively.