CAJ | 학술논문

用浸渍法制备了镧系元素(Ce,La,Sm)修饰的低负载Pd(0.05 w.t%)/Al2O3催化剂,并应用于丙烯腈选择性加氢反应,实验结果表明:这种方法制备的催化剂对丙烯腈具有很好的选择性,镧系元素的添加大大促进了催化剂的活性和稳定性.XRD的测试结果表明稀土元素铈的添加减弱了Pd和载体Al2O3之间的相互作用,从而导致了Pd从载体表面游离出来.从TEM照片上可以看出催化剂颗粒尺寸的变化.XPS的测试结果表明用镧系元素修饰的Pd的结合能向较高能级发生了转移,从而使得钯被还原为零价.
용침지법제비료란계원소(Ce,La,Sm)수식적저부재Pd(0.05 w.t%)/Al2O3최화제,병응용우병희정선택성가경반응,실험결과표명:저충방법제비적최화제대병희정구유흔호적선택성,란계원소적첨가대대촉진료최화제적활성화은정성.XRD적측시결과표명희토원소시적첨가감약료Pd화재체Al2O3지간적상호작용,종이도치료Pd종재체표면유리출래.종TEM조편상가이간출최화제과립척촌적변화.XPS적측시결과표명용란계원소수식적Pd적결합능향교고능급발생료전이,종이사득파피환원위령개.
Low-loaded Pd(0.05w.t%)/Al2O3 catalysts promoted with lanthanide elements(Ce,La,Sm) were prepared by wet impregnation method.Experiment of seletive hydrogenaqtion of acrylonitrile indicated that the as-prepared catalysts showed a good selectivity to propionitrile and the addition of lanthanide elements greatly improved the activity and stability.XRD results showed cerium interacted with the support γ-Al2O3 to weaken the interaction between Pd and Al2O3, resulting in free Pd from the support.From the TEM images we can see the change of the particle size of the catalysts.From the XPS results,the binding energies of Pd promoted with lanthanide were shifted to higher energies and palladium species had been reduced to zero valence.