CAJ | 학술논문

用取代法制备了十二钼锗(硅)酸的Pd,Ir,Ru取代化合物.由IR,UV及EPR方法测定表明,产物仍保持了其母体化合物的Keggin结构,同时Pd,Ir,Ru等贵金属阳离子确实取代了Keggin结构中的一个Mo原子.电化学研究表明Ru,Ir取代了母体化合物中的1个Mo后,多酸母体上的氧化-还原可逆性增强;而Pd取代化合物由于在电极上的吸附作用使其电化学行为不能被清晰观察到.对上述化合物初步的催化研究表明,这几个化合物均有较好的催化氧化环己烯的活性.
용취대법제비료십이목타(규)산적Pd,Ir,Ru취대화합물.유IR,UV급EPR방법측정표명,산물잉보지료기모체화합물적Keggin결구,동시Pd,Ir,Ru등귀금속양리자학실취대료Keggin결구중적일개Mo원자.전화학연구표명Ru,Ir취대료모체화합물중적1개Mo후,다산모체상적양화-환원가역성증강;이Pd취대화합물유우재전겁상적흡부작용사기전화학행위불능피청석관찰도.대상술화합물초보적최화연구표명,저궤개화합물균유교호적최화양화배기희적활성.
Using substitution method, the Pd, Ir, Ru noble metal substituted polyoxomolybdates with the general formula α-(n-Bu4N)n XMo11M(H2O)O39(X=Si,Ge;M=Pd(Ⅱ), Ru(Ⅲ), Ir(Ⅳ)) have been prepared. The measurements of IR, UV and EPR show that the products still remain the Keggin type structure of their parental compound, and the cation of noble metal Pd or Ir or Ru does substitute one Mo of the parental compound. Electrochemical study shows that after Ir substitutes one Mo of the parental compound, the redox reversitbility of the polyacid parent is improved, but the electrochemical behavior of Pd substituted compound can not be observed clearly because of its adsorption on electrode. The preliminary catalytic studies of the compounds mentioned above show that all these substituted polyoxomolybdates have fairly good catalytic activities for the cyclohexene epoxidation reaction.