KBH_4还原法制备超细Pd/-γAl_2O_3催化剂及其在蒽醌加氢反应中的应用  

Preparation of Ultrafine Pd/(γ-Al_2O_3) Catalyst by KBH_4 Reduction and Its Application to Anthraquinone Hydrogenation

作　　者：王寰[1] 李伟[1] 张明慧[1] 陶克毅[1] 

机构地区：[1]南开大学化学学院材料化学系新催化材料科学研究所,天津300071

出　　处：《催化学报》2005年第10期855-858,共4页

基　　金：国家自然科学基金(20273035);天津市自然科学基金(033802511);南开大学创新课题基金资助项目

摘　　要：通过KBH4还原浸渍到载体上的Pd物种制备了超细Pd/-γAl2O3催化剂,并采用X射线衍射、高倍透射电镜、能谱、能量损失谱和电感耦合等离子体发射光谱等对其进行了表征.结果表明,催化剂中活性组分Pd以纳米尺度的微晶形式存在,而不是Pd-B非晶态合金.蒽醌加氢制双氧水反应证明,与浸渍焙烧法制备的PdO/-γAl2O3催化剂相比,经KBH4还原制得的Pd/-γAl2O3催化剂中钯的晶体颗粒更小,分散度更高,从而催化剂的活性更高,其氢化效率比PdO/-γAl2O3提高了35%.The ultrafine Pd/γ-Al2O3 catalyst was prepared by impregnation of alumina support with PdCl2 solution followed by KBH4 reduction. The microstructure of Pd/γ-Al2O3 was investigated by X-ray diffraction, high resolution electron microscopy, energy dispersive spectroscopy and electron energy loss spectroscopy. The results show that the Pd species exists as Pd nanocrystals in the as-prepared catalyst, and no Pd-B amorphous alloy was found. Compared with the Pd/γ-Al2O3 catalyst prepared by impregnation and calcination, the ultrafine Pd/γ-Al2O3 exhibits higher activity in the hydrogenation of 2-ethylanthraquinone. This can be attributed to the unique properties of the ultrafine Pd/γ-Al2O3, such as smaller Pd crystals and the higher dispersion of Pd on the support.

关 键 词：钯 氧化铝 硼氢化钾 蒽醌 加氢 

分 类 号：O621.251[理学—有机化学] O643.36[理学—化学]